Mahdı Hesamı Afshar

Department of Civil Engineering
Web of Science Researcher ID
Global spatiotemporal consistency between meteorological and soil moisture drought indices
Afshar, Mahdı Hesamı ; Bulut, B.; Düzenli, Eren; Amjad, M.; Yılmaz, Mustafa Tuğrul (2022-04-01)
In this study, the consistency of a set of meteorological and soil moisture drought indices has been analyzed using the linear relationship between them. Commonly used Standardized Precipitation Index (SPI) and Standardize...
Comparative Evaluation of Microwave L-Band VOD and Optical NDVI for Agriculture Drought Detection over Central Europe
Al-Yaari, Amen; Afshar, Mahdı Hesamı ; Yılmaz, Mustafa Tuğrul (2021-04-01)
Agricultural droughts impose many economic and social losses on various communities. Most of the effective tools developed for agricultural drought assessment are based on vegetation indices (VIs). The aim of this study is...
Improving the Performance of Index Insurance Using Crop Models and Phenological Monitoring
Afshar, Mahdı Hesamı ; Higginbottom, Thomas P.; Parkes, Ben; Hufkens, Koen; Mansabdar, Sanjay; Ceballos, Francisco; Kramer, Berber (2021-03-01)
Extreme weather events cause considerable damage to the livelihoods of smallholder farmers globally. Whilst index insurance can help farmers cope with the financial consequences of extreme weather, a major challenge for in...
Climate change impact assessment on mild and extreme drought events using copulas over Ankara, Turkey
Afshar, Mahdı Hesamı ; Tosunoglu, Fatih; Bulut, Burak; Yılmaz, Mustafa Tuğrul (Springer Science and Business Media LLC, 2020-08-01)
Climate change, one of the major environmental challenges facing mankind, has caused intermittent droughts in many regions resulting in reduced water resources. This study investigated the impact of climate change on the c...
Improving performance of index insurance using crop models and phenological monitoring
Afshar, Mahdı Hesamı ; Parkes, Ben; Hufkens, Koen; Ceballos, Francisco (2020-05-04)
Extreme weather events pose significant risks to the livelihoods of smallholder farmers across Asia and Africa. Weather index-based insurance provides a potential solution to mitigate risks caused by crop failures, providi...
Climate change impacts on meteorological drought using SPI and SPEI: case study of Ankara, Turkey
MEHR, ALI DANANDEH; Sorman, Ali Unal; Kahya, Ercan; Afshar, Mahdı Hesamı (Informa UK Limited, 2019-11-27)
Using regionally downscaled and adjusted outputs of three global climate models (GCMs), meteorological drought analysis was accomplished across Ankara, the capital city of Turkey. To this end, standardized precipitation in...
Impact of Rescaling Approaches in Simple Fusion of Soil Moisture Products
Afshar, Mahdı Hesamı ; Yılmaz, Mustafa Tuğrul (American Geophysical Union (AGU), 2019-09-10)
In this study, the impact of various rescaling approaches in the framework of data fusion is explored. Four different soil moisture products (Advanced Scatterometer; Advanced Microwave Scanning Radiometer for EOS, AMSR-E; ...
Evaluation of Remotely-Sensed and Model-Based Soil Moisture Products According to Different Soil Type, Vegetation Cover and Climate Regime Using Station-Based Observations over Turkey
Bulut, Burak; Yılmaz, Mustafa Tuğrul; Afshar, Mahdı Hesamı ; Sorman, A. Unal; Yücel, İsmail; Cosh, Michael H.; Simsek, Osman (MDPI AG, 2019-08-01)
This study evaluates the performance of widely-used remotely sensed- and model-based soil moisture products, including: The Advanced Scatterometer (ASCAT), the Advanced Microwave Scanning Radiometer-Earth Observing System ...
The added utility of nonlinear methods compared to linear methods in rescaling soil moisture products
Afshar, Mahdı Hesamı ; Yılmaz, Mustafa Tuğrul (2017-07-01)
In this study, the added utility of nonlinear rescaling methods relative to linear methods in the framework of creating a homogenous soil moisture time series has been explored. The performances of 31 linear and nonlinear ...
Conditional Copula-Based Spatial-Temporal Drought Characteristics Analysis-A Case Study over Turkey
Afshar, Mahdı Hesamı ; Yılmaz, Mustafa Tuğrul (2016-10-01)
In this study, commonly used copula functions belonging to Archimedean and Elliptical families are fitted to the univariate cumulative distribution functions (CDF) of the drought characteristics duration (LD), average seve...
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