Nicolas Dalezios
University of Thessaly, Civil Engineering, Faculty Member
Evapotranspiration plays a fundamental role in agricultural water management. Its calculation requires weather data, such as radiation, which are often not available and should be estimated indirectly. This study employed the Ref-ET... more
Evapotranspiration plays a fundamental role in agricultural water management. Its calculation requires weather data, such as radiation, which are often not available and should be estimated indirectly. This study employed the Ref-ET software for estimating radiation for the period of 1970-2011 under two different climates of Rasht and Isfahan. Results showed that for Isfahan, the first method (minimum and maximum temperature difference) was satisfied with KRS=0.17, indicating good results. For Rasht, radiation was estimated using the third method (KRS) assuming KRS=0/44, and the evapotranspiration relative to the values of evapotranspiration in the presence of data was acceptable. Also, results of evapotranspiration derived from the Turque equation in Isfahan and results of the Penman-Monteith FAO relation for Rasht were more acceptable. Keywords: Radiation; Rapid Evaporation; REF-ET
Research Interests: Water, Water quality, Water resources, Water and wastewater treatment, Water Purification, and 11 moreWater Engineering, Water Treatment, Sustainable Water Resources Management, Soil and Water Engineering, Water Resources engineering, Watershed Hydrology, Water Pollution, Application of GIS and RS for Integrated Watershed Management, Water Resources Management, Integrated Water Resources Management, and Waste water treatment
Self-cleaning, as a well-known solution for various applications, has been the centre of attention amongst scientists. One of the properties that can be discussed in this scope is the application of various materials for different... more
Self-cleaning, as a well-known solution for various applications, has been the centre of attention amongst scientists. One of the properties that can be discussed in this scope is the application of various materials for different purposes. This covers a wide range of solar cell devices to building materials and indoor applications. Besides cost as one of the most important issues, using some materials without considering their long-term effects or irradiation source can be a sophisticated problem in this area. Hence, titanium dioxide (TiO2) with a combination of several materials, such as composites, can have competent capacity or even the potential of double self-cleaning properties. Current review gives a promising aspect to the knowledge of various combinations of TiO 2 with specific materials as a composite or polymer to improve and optimize the potential self-cleaning properties.
Research Interests: Materials Engineering, Materials Science, Construction Materials, Composite Materials and Structures, Building Materials (Archaeology), and 13 moreMaterials, Composite Materials, Materials selection in design, Mechanical Behavior Of Materials, Materials Science and Engineering, Mechanics of Materials, Metallurgy and Materials Engineering, Materials development, Mechanical Properties of Materials, Metallurgical and Materials Engineering, Strength of materials, Biological Materials Subjects, and Materials Technology (Wood Derivatives)
In our country, in addition to economically significant costs of wasting water, which the government should pay, and our country has limited water resources. Therefore, identifying ways of occurrence of water losses and providing... more
In our country, in addition to economically significant costs of wasting water, which the government should pay, and our country has limited water resources. Therefore, identifying ways of occurrence of water losses and providing solutions to these problems will be a great challenge for the newly created water and wastewater industry in the country. The main objective of this review is to prove the high-water waste in Isfahan water distribution networks and to obtain its amount and provide methods for identifying and reduction its bad effects. In this review, the annual water balance method has been used to calculate non-accounted water, it means the difference between water production and consumption. Finally, the most important reasons for water loss at pilot points are the failure plan and the inaccuracy of subscribers' water meters, burnout of pipes, installations, faucets and the lack of proper design of the water distribution network and unauthorized branching. According to the research carried out in this research project, the amount of not considered water in the scope of the project was approximately (33.6%) and in the villages of Senete complexes, Yazebolaghi, Ghamlu and Alyverdi were 33.8%, 33.7%, 33.9%, and 33.9% respectively.
Research Interests: Water Distribution Systems, Small and medium sized communities, Small Communities Solution, Water Distribution Network Design and Calibration, mapping seagrass distribution using remote sensing and GIS and utilizing factors that affect seagrass distribution (water quality, sediment quality, oceanography etc) to model spatial seagrass distribution, and 14 moreSmall Learning Communities, Drugs in Small Communities, Water Distribution Networks, Distribution of Arsenic in rice plant, soil, water., Small mammal communities Guatemala, Genetic Effects in Small Communities, Small-Scale Fishing Communities with Marine Protected Area (MPA) in Cebu Main Island, Cebu Province, Philippines: Welfare and MPA Management, Water Delivery System (Water Distribution System and sewage network)., Small Arms and Light Weapons Among Pastoral Communities, Water Distribution Network, Efficiency of Water Distribution Systems, Small Christian Communities, Small Christian Communities; Domestic Church, and Establishment of Small Fishing Communities in Southwest Forida
Sometimes roads and streets in the cities and villages of the country are witnessing numerous excavations by institutions and municipal and service organizations, including municipalities, power departments, telecommunications, and more.... more
Sometimes roads and streets in the cities and villages of the country are witnessing numerous excavations by institutions and municipal and service organizations, including municipalities, power departments, telecommunications, and more. These drills are new for various reasons, such as the establishment of pipelines for water transport, sewerage, gas, and even the transfer and distribution of petroleum fuels, including crude oil, and in fact for the construction and installation of winding and cable laying, or because of damaged pipes and cables under the soil, drilling, excavating, changing and repairing the grid is done.
Research Interests: Offshore Pipelines, Wave hydrodynamics, Wave forces on marine structures, Breakwaters, Submarine pipelines, Extreme waves and winds, Wave, Ocean thermal and tidal energy, Gas Pipelines, Pipelines, Pipelines, Floating Structures, Risers, and 11 moreOil and gas pipelines, tanks and other objects, Passive and Active Defense, Buried Pipelines, Water Pipelines, Corrosion Control of Pipelines Using Cathodic Protection Method, Analysis of Pipelines, Oil Pipelines, Submarine Pipelines, Oil and Gas Pipelines, Paraffin Deposition In Crude Oil Pipelines, and Hydrates Formation In Pipelines
Many construction buildings and Structural barrier members that was built before 90s in USA, they weren't designed for Seismic resistance until Federal Emergency Management Agency FEMA started to do seismic evaluation and rehabilitation... more
Many construction buildings and Structural barrier members that was built before 90s in USA, they weren't designed for Seismic resistance until Federal Emergency Management Agency FEMA started to do seismic evaluation and rehabilitation and suggested reinforcement methods. In this article we evaluate FRP sheet reinforcement.
Research Interests: Reinforcement Learning, Reinforced concrete and bonding, FIBRE REINFORCED CONCRETE, Reinforced Concrete Structures, Soil Reinforcement, and 10 moreReinforcement, 3. Study the Behavior of Reinforced Concrete Elements Incorporating Different Waste Materials, 4. Improvement of Ductility of High Strength Reinforced Concrete Elements, Behavior of Concrete Structures Reinforced with FRP Composites, Reinforced concrete, Reinforced Concrete Design, Soil Treatment & Soil Reinforcement Techniques, Fiber Reinforced Concrete, carbon fiber reinforcement polymer (CFRP), and Geogrid Reinforcement
There are many ways to investigate the flood watersheds, which one can refer to the regional flood analysis. The regional flood analysis approach relies on the physical, climatic and ecological characteristics of the watersheds; it uses... more
There are many ways to investigate the flood watersheds, which one can refer to the regional flood analysis. The regional flood analysis approach relies on the physical, climatic and ecological characteristics of the watersheds; it uses statistical methods to study current observation data. This approach has many ways. Husking and Wallis with the expansion of the probability weighted torque method, linear torque statistics were presented as a new index in the analysis of watershed flood alternation variation. The theory of linear moments is the basis of the present study. In this study, 27 hydrometric stations located in the central region of Iran were investigated. Using linear torque diagrams, the linear skew curve was determined against the linear elongation and the most appropriate fitting distributions for each study station. Then, in order to remove the impossible stations, homogeneity tests were performed based on heterogeneity and heterogeneity parameters and finally two stations Barez and Gabr abad were identified as heterogeneous stations. In the next step, good fit test is performed to determine the most appropriate distribution function of the region, and respectively, generalized logistic distribution, generic limit values, normalized general, Pearson type 3 and General Pareto were the most appropriate distribution for areas. Eventually, estimated values of discharge with different frequency in the region were determined, and the selected distribution regional parameters were presented.
Keywords:
Linear Torque, Probability Weight Torque, Analysis of Regional Flood.
Keywords:
Linear Torque, Probability Weight Torque, Analysis of Regional Flood.
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In our country, in addition to economically significant costs of wasting water, which the government should pay, and our country has limited water resources. Therefore, identifying ways of occurrence of water losses and providing... more
In our country, in addition to economically significant costs of wasting water, which the government should pay, and our country has limited water resources. Therefore, identifying ways of occurrence of water losses and providing solutions to these problems will be a great challenge for the newly created water and wastewater industry in the country. The main objective of this review is to prove the high-water waste in Isfahan water distribution networks and to obtain its amount and provide methods for identifying and reduction its bad effects. In this review, the annual water balance method has been used to calculate non-accounted water, it means the difference between water production and consumption. Finally, the most important reasons for water loss at pilot points are the failure plan and the inaccuracy of subscribers' water meters, burnout of pipes, installations, faucets and the lack of proper design of the water distribution network and unauthorized branching. According to the research carried out in this research project, the amount of not considered water in the scope of the project was approximately (33.6%) and in the villages of Senete complexes, Yazebolaghi, Ghamlu and Alyverdi were 33.8%, 33.7%, 33.9%, and 33.9% respectively.
Research Interests: Water, Water quality, Water resources, Water and wastewater treatment, Water Treatment, and 9 moreSustainable Water Resources Management, Water Resources engineering, Watershed Hydrology, Water Pollution, Climate Change impact assessment on long-term water availability at catchment level, Waste water treatment, Hydrobiology, Diversity of Fresh Water Zooplankton,water Quality Assessment, Water Quality Monitoring & Assessment, and Water Quality Assessment
Drought is one of the most devastating natural disasters that often occurs in different parts of Iran. In this research, in order to monitor the drought in Karkheh watershed, two standard rainfall and rainfall decimals were used and... more
Drought is one of the most devastating natural disasters that often occurs in different parts of Iran. In this research, in order to monitor the drought in Karkheh watershed, two standard rainfall and rainfall decimals were used and rainfall data of 12 meteorological stations was used. Homogeneity of rainfall data was investigated by sequencing test. After preparing the data, the standard rainfall index was calculated at 12, 9, and 24-month scale as well as annual precipitation deciles. The severity of drought and percent and percentage of village were determined using Kriging method. The results showed that drought of the meteorological period firstly, SPI, drought frequency is based on the index in shorter time scale of the standard rainfall index, and in the event of continued adverse weather conditions, the meteorological drought also occurs in long-run time scales. The severity and frequency of meteorological droughts decrease from west to east of the basin. Also, the percentage of drought (the ratio of drought periods to the entire statistical period) increased, the severity of drought would also increase.
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In order to optimize the usage of water in agriculture, it is necessary to increase the efficiency of irrigation systems, especially those of surface irrigation. One of the steps to be made to achieve this goal is the optimal design of... more
In order to optimize the usage of water in agriculture, it is necessary to increase the efficiency of irrigation systems, especially those of surface irrigation. One of the steps to be made to achieve this goal is the optimal design of surface irrigation. It this article the design variables of furrow irrigation, that includes length of furrow, inflow rate and irrigation time (time of cutoff), were calculated to minimize the irrigation costs, the objective function, and to obtain a maximum application efficiency. The objective function encompasses water, labor, head ditch and furrow digging (ditch constructions) costs. Labor cost is irrigation time's function and the latter is dependent on water advance period in the furrows. Therefore, it is necessary for the objective function to apply explicit and accurate equation in order to calculate time of advance. Because in none of the accurate methods for furrow irrigation design, such as zero-inertia modeling, the advance time is explicitly calculated, therefore in this research the equation obtained by Valiantzas, which he extracted from the results of zero-inertia modeling, was used. In the objective function in addition to the design variables the specifications of soil, furrow and net irrigation requirement also exist. Therefore, it is possible to calculate design variables and afterwards the irrigation efficiency for different soil types and plant types. In this article this task was performed with different soil types and in accordance with different requirements for irrigation and the results are presented in the tables.
Research Interests: Irrigation, Irrigation water use efficiency, Irrigation Engineering, Irrigation Systems Design, Irrigation water Management, and 21 moreIrrigation Water Management (Archaeology), Irrigation & Drainage, Drip / trickle irrigation, Drip Irrigation, Irrigation and Drainage, Irrigation scheduling of different crop by automated drip irrigation system by using low cost sensor, Irrigation and Drainage Engineering, Efficient and Equity Use of Water Resource for Irrigation, Drip irrigation and Water resources management, Fertigation and Irrigation Applied Through Drip Irrigation, Irrigation water pricing, EFFECT OF PULSE DRIP IRRIGATION ON SOIL MOISTURE DISTRIBUTION AND MAIZE..., Solar for Irrigation, Constraints on Irrigation Schemes, Participatory Irrigation Management, Optimal Water Allocation for Irrigation Planning, Small scall Irrigation, Simulation of Deficit Irrigation on Crops Production, Effluent Irrigation, Irrigation Improvement, and Greenhouses Irrigation
In order to optimize the usage of water in agriculture, it is necessary to increase the efficiency of irrigation systems, especially those of surface irrigation. One of the steps to be made to achieve this goal is the optimal design of... more
In order to optimize the usage of water in agriculture, it is necessary to increase the efficiency of irrigation systems, especially those of surface irrigation. One of the steps to be made to achieve this goal is the optimal design of surface irrigation. It this article the design variables of furrow irrigation, that includes length of furrow, inflow rate and irrigation time (time of cutoff), were calculated to minimize the irrigation costs, the objective function, and to obtain a maximum application efficiency. The objective function encompasses water, labor, head ditch and furrow digging (ditch constructions) costs. Labor cost is irrigation time's function and the latter is dependent on water advance period in the furrows. Therefore, it is necessary for the objective function to apply explicit and accurate equation in order to calculate time of advance. Because in none of the accurate methods for furrow irrigation design, such as zero-inertia modeling, the advance time is explicitly calculated, therefore in this research the equation obtained by Valiantzas, which he extracted from the results of zero-inertia modeling, was used. In the objective function in addition to the design variables the specifications of soil, furrow and net irrigation requirement also exist. Therefore, it is possible to calculate design variables and afterwards the irrigation efficiency for different soil types and plant types. In this article this task was performed with different soil types and in accordance with different requirements for irrigation and the results are presented in the tables.
Research Interests: Irrigation, Irrigation water use efficiency, Irrigation Engineering, Irrigation Systems Design, Irrigation water Management, and 29 moreIrrigation Water Management (Archaeology), Irrigation & Drainage, Ancient Irrigation Systems, Irrigation in Rice Based Cropping System Especially in Coastal Ecosystem, Drip / trickle irrigation, Drip Irrigation, Subsurface Drip Irrigation, Irrigation Scheduling, Irrigation and Drainage, Irrigation scheduling of different crop by automated drip irrigation system by using low cost sensor, Center-Pivot irrigation system, Irrigation and Drainage Engineering, Efficient and Equity Use of Water Resource for Irrigation, Drip irrigation and Water resources management, Fertigation and Irrigation Applied Through Drip Irrigation, Irrigation water pricing, EFFECT OF PULSE DRIP IRRIGATION ON SOIL MOISTURE DISTRIBUTION AND MAIZE..., Solar for Irrigation, Constraints on Irrigation Schemes, Participatory Irrigation Management, Optimal Water Allocation for Irrigation Planning, Crop Water Requirements and Irrigation Scheduling, Irrigation Water Quality, Conjunctive Irrigation Management, Small scall Irrigation, Simulation of Deficit Irrigation on Crops Production, Effluent Irrigation, Irrigation Improvement, and Greenhouses Irrigation
Major agricultural crops such as vineyards and apples can be monitored by comparing normalized difference vegetation index (NDVI) with several agrometeorological indices. The agrometeorological indices used in this study are heat unit... more
Major agricultural crops such as vineyards and apples can be monitored by comparing normalized difference vegetation index (NDVI) with several agrometeorological indices. The agrometeorological indices used in this study are heat unit (HU), photo-thermal unit, vapor pressure deficit, phototemperature nyctotemperature and cumulative precipitation. The NDVI curve of temporal variability for vineyards have shown an unexpected fluctuation with continuous high and low values, whereas the raise in chlorophyll concentration due to first spring sprouting should correspond to NDVI raise. No particular relation between cumulative rainfall and NDVI is detected, because the vineyards of the studied area are systematically irrigated. An inverse correlation between degree-days and NDVI especially during the second 10-day interval of August was also detected. For apples, a positive relationship between the HU parameter and NDVI, was observed. The amount of cumulative degree-days was also important at the end of natural ripening, which signifies the importance of the HU to apple crops. The whole study has shown that maximum NDVI can be used for crop monitoring in Greece. Furthermore, NDVI is representative of phenological changes of the examined crops, namely vineyards and apples. There is a positive and strong relationship between NDVI and some agrometeorological indices and parameters , especially HU and cumulative rainfall throughout the growing season of 1994. This finding was mainly due to the critical significance of basic meteorological parameters to plant's physiology and phenology, such as air temperature, relative humidity and rainfall.
... BURL Processing System for Satellite data, Report BURL 3.6, Bradford University Research Ltd., UK, (1991). 3. NJRosenberg, BLBlad and SBVerma, Microclimate The Biological Environment, John Wiley Sons, 2nd Edition, NY, 1983. 4. NJ... more
... BURL Processing System for Satellite data, Report BURL 3.6, Bradford University Research Ltd., UK, (1991). 3. NJRosenberg, BLBlad and SBVerma, Microclimate The Biological Environment, John Wiley Sons, 2nd Edition, NY, 1983. 4. NJ Rosenberg and RE Myers, The nature ...
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The potential impact of future climate change on runoff generation processes in two southern British Columbia catchments was explored using the Canadian Centre for Climate Modelling Analysis General Circulation Model (CGCMa1) to estimate... more
The potential impact of future climate change on runoff generation processes in two southern British Columbia catchments was explored using the Canadian Centre for Climate Modelling Analysis General Circulation Model (CGCMa1) to estimate future changes in precipitation, temperature and cloud cover while the U.B.C. Watershed Model was used to simulate discharges and quantify the separate runoff components, i.e. rainfall, snowmelt, glacier melt and groundwater. Changes, not only in precipitation and temperature but also in the spatial distribution of precipitation with elevation, cloud cover, glacier extension, altitude distribution of vegetation, vegetation biomass production and plant physiology were considered. The future climate of the catchments would be wetter and warmer than the present. In the maritime rain-fed catchment of the Upper Campbell, runoff from rainfall is the most significant source of flow for present and future climatic conditions in the autumn and winter whereas runoff from groundwater generates the flow in spring and summer, especially for the future climate scenario. The total runoff, under the future climatic conditions, would increase in the autumn and winter and decrease in spring and summer. In contrast, in the interior snow-covered Illecillewaet catchment, groundwater is the most significant runoff generation mechanism in the autumn and winter although, at present, significant flow is generated from snowmelt in spring and from glacier runoff in summer. In the future scenario, the contribution to flow from snowmelt would increase in winter and diminish in spring while the runoff from the glacier would remain unchanged; groundwater would then become the most significant source of runoff, which would peak earlier in the season.
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The accuracy of an optimum interpolation technique in filling missing values in multichannel (or multisite) hydrologic series containing time-coincident data gaps is examined. The applied methodology is based on the maximum entropy method... more
The accuracy of an optimum interpolation technique in filling missing values in multichannel (or multisite) hydrologic series containing time-coincident data gaps is examined. The applied methodology is based on the maximum entropy method (MEM) of spectral estimation or multivariate autoregressive modeling and heavily depends upon the properties of multichannel prediction error filter (PEF). Six precipitation time series spatially located within a hydrologic basin are used and time-coincident artificial gaps are created in all six series. The performance of the technique is assessed by comparing the filled-in series to the observed and by employing spectral analysis. The results reveal the usefulness of the method in multichannel hydrologic analysis.
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The diachronic variability of precipitation is of major scientific concern, because it is linked to water availability or deficiency on regional scale. The latter, resulted from a prolonged period of abnormally low precipitation or... more
The diachronic variability of precipitation is of major scientific concern, because it is linked to water availability or deficiency on regional scale. The latter, resulted from a prolonged period of abnormally low precipitation or permanent absence of precipitation, is associated with dryness, having on one hand, a substantial impact on agricultural production and thus the society itself, and on the other hand, the redistribution of flora and fauna. In some cases, dryness drive climate refugees, and this is a great challenge - threat - that must be faced – mitigated - by stake holders in international organizations and fora. The Aridity Index (AI) measures the degree of dryness of the climate at a given region, and according to the United Nations Environmental Programme (UNEP) it is defined as the ratio of precipitation to the potential evapotranspiration. In this study, we investigate the climate change impacts on AI over Thessaly plain, Greece. Thessaly, the largest plain and gra...
Droughts are regional phenomena, which are considered as one of the major natural environmental hazards affecting many impacts of life and especially agriculture. Climate variability may result into harmful drought periods in semiarid... more
Droughts are regional phenomena, which are considered as one of the major natural environmental hazards affecting many impacts of life and especially agriculture. Climate variability may result into harmful drought periods in semiarid regions. This study proposes an innovative approach for investigating the accumulated meteorological effects on cotton during the growing season. The quantification of the weather effects is based on the application of the Bhalme and Mooley Drought Index (BMDI) methodology on the Vegetation Condition Index (VCI) extracted by NOAA/AVHRR data. The resulted Bhalme and Mooley Vegetation Condition Index (BMVCI) is in the same scale as the Z-Index, as proposed in the Palmer Drought Severity Index (PDSI) for drought monitoring. The study area comprises the region of Thessaly, which is the most cotton productive area in Greece. Eighteen years of NOAA/AVHRR data are examined and processed with the BMVCI to examine the unfavour conditions for cotton production. ...
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Agricultural drought is a natural hazard having direct impacts to crop yield. One major application of remote sensing to agriculture is crop monitoring and assessment of vegetative stress, whereas satellite derived indices have been... more
Agricultural drought is a natural hazard having direct impacts to crop yield. One major application of remote sensing to agriculture is crop monitoring and assessment of vegetative stress, whereas satellite derived indices have been extensively used for identifying stress periods in crops. In this paper, two remotely sensed indices are used in order to quantify agricultural drought impact to cotton growth and estimate the final yield. In specific, Vegetation Condition Index (VCI) and Temperature Condition Index (TCI) are used to monitor agricultural drought and estimate cotton yield. VCI and TCI characterises the moisture and thermal conditions of vegetation, respectively. VCI has excellent ability to detect drought, whereas TCI can identify thermal stresses that have direct impact in vegetation's health. The two indices are computed for 20 hydrological years, from October 1981 to September 2001, from NOAA/AVHRR ten -day composite images with 8x8 Km spatial resolution. VCI and T...
Droughts are regional phenomena and have been referred to as "non events", since their basic cause is the lack of precipitation events in a region over a period of time associated with a higher than normal temperatures. The... more
Droughts are regional phenomena and have been referred to as "non events", since their basic cause is the lack of precipitation events in a region over a period of time associated with a higher than normal temperatures. The severity of drought depends upon the degree of moisture deficiency, the duration and the size of the affected area. Drought impacts significantly affect the ecosystems, social - economic environment and mainly agricultural areas which necessitate the monitoring and assessment of drought's onset, duration, severity and areal extent. There is a variety of drought indices provided in literature. Among them the Reconnaissance Drought Index (RDI) has been recently developed and applied. RDI is used to estimate the hydro-meteorological drought conditions based on precipitation and potential evapotraspiration. This index is already applied in several areas of Greece using conventional ground measurements. In order to map the drought conditions over a large...
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Water for food production represents by far the largest share among all uses and its demand keeps growing with increasing population. The lack of water can affect disfavour the economic and social stability of entire regions. New... more
Water for food production represents by far the largest share among all uses and its demand keeps growing with increasing population. The lack of water can affect disfavour the economic and social stability of entire regions. New technologies (Earth Observation, Geographic Information Systems) provide the possibility of time and spatial observation for the decision support and management. PLEIADeS (Participatory multi-Level EO-assisted tools for Irrigation water management and Agricultural Decision -Support) addresses the efficient and sustainable use of water for food production in water - scarce environments with the use of satellite data and GIS. To the present study is described the process that applied for the computation of crop coefficient Kc that constitutes the basic parameter for the computation of evapotraspiration and accordingly the water needs of crops. Monitoring of Kc with ground based measurements is a time-consuming process and almost unfeasible to apply in large s...
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Identifying vulnerable agricultural production areas is essential for any sustainable development/farming plan. Climate is among the most important factors that determine the agricultural potential of a region and the suitability of an... more
Identifying vulnerable agricultural production areas is essential for any sustainable development/farming plan. Climate is among the most important factors that determine the agricultural potential of a region and the suitability of an area for a specific crop or land management, followed by soil characteristics and geomorphology. Temperature and rainfall in terms of quantity and spatiotemporal variability are the two climatic variables that determine the agricultural potential of an area and the risk involved in any new agronomical use. Also, extreme weather events, such as droughts, have to be taken into account. In this paper, two satellite derived indices are combined in GIS environment with soil maps and a Digital Elevation Model (DEM) in order to identify the agricultural potential of areas. Namely, these indices are the Vegetation Health Index (VHI) and the Degree Days (DD) (also known as Heat Units). VHI represents overall vegetation health and is used for agricultural droug...
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Agriculture is a primary productivity sector which is highly dependent on environmental conditions. The agroclimatic potential of agricultural areas has to be assessed in order to achieve sustainable and efficient use of natural resources... more
Agriculture is a primary productivity sector which is highly dependent on environmental conditions. The agroclimatic potential of agricultural areas has to be assessed in order to achieve sustainable and efficient use of natural resources in combination with production maximization. Temperature and rainfall, in terms of quantity and spatiotemporal variability, are variables which determine the type of crops suitable to a given location. Rainfall variable can also be interpreted as availability of sufficient water required for production of given crops. These variables, in combination with soil type and geomorphology, also determine areas where high levels of production are appropriate, avoiding the threat of degrading the natural resources. In the current work, zones indicating water availability are combined with topographic features and soil types in order to identify areas for sustainable production. Firstly, aridity index (AI) and vegetation health index (VHI) are used in order ...
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Water for food production represents by far the largest share among all uses and its demand keeps growing with increasing population. The lack of water can affect disfavour the economic and social stability of entire regions. New... more
Water for food production represents by far the largest share among all uses and its demand keeps growing with increasing population. The lack of water can affect disfavour the economic and social stability of entire regions. New technologies (Earth Observation, Geographic Information Systems) provide the possibility of time and spatial observation for the decision support and management. In this paper applied principles of precision agriculture through variable-rate inputs by the efficient monitoring of crop needs in space and time, defined zones of sustainable production by means of parallelepiped supervised classification using two indices, the soil maps and the DEM and described the process for the computation of crop evapotraspiration ET p for cotton fields in central Creece, a high agricultural productivity area that produces high quality products. The methodology was also used in Project PLEIADeS and new projects SMART and HYDROSENSE. For the data collection cotton fields wer...
Some of the European systems and sectors have shown particular sensitivity to recent trends in temperature and precipitation. The major goal of this work is to summarize a questionnaire on trends in agroclimatic indices and crop model... more
Some of the European systems and sectors have shown particular sensitivity to recent trends in temperature and precipitation. The major goal of this work is to summarize a questionnaire on trends in agroclimatic indices and crop model outputs in Europe. This questionnaire was developed and disseminated by Working Group 2 of the COST 734 Action 'Impacts of Climate Change and Variability on European Agriculture – CLIVAGRI". The first part of the survey is related to the availability of long-term historical meteorological and agrometeorological data, its temporal and spatial resolution, area coverage, etc. The second part is dedicated on the various meteorological models applied in selected European countries – numerical weather models, global and regional climate models, weather generators. A special attention in this survey is paid on data homogenization tests, techniques and software. Finally, the answers based on the statistical methods for analyses of meteorological and s...
This paper presents an Integrated Methodological Procedure for Alternative Drought Mitigation in Greece. The examined alternative drought mitigation is rain enhanced through cloud seeding. It has long been recognized that cloud seeding is... more
This paper presents an Integrated Methodological Procedure for Alternative Drought Mitigation in Greece. The examined alternative drought mitigation is rain enhanced through cloud seeding. It has long been recognized that cloud seeding is one possible approach for rain enhancement. This paper constitutes a synthesis of several studies with the objective of finding conclusive evidence leading to the design of a rain enhancement program in semiarid areas of northern and central Greece. These studies include the climatology and characteristics of rain, the detection of the severity, extent and periodicity of drought, the investigation of cloud climatology and characteristics as well as the structure and microphysics of clouds. These studies are expected to clarify whether natural processes are efficient and if seeding is likely to be effective. Furthermore an airborne glaciogenic seeding rain experiment case study is presented for rainfall augmentation from summertime towering cumulus ...
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