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evaluation of drought in gandaki river basin, nepal
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نویسنده
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bhattarai aayush ,timilsina sachin ,ayer santosh ,paudel gayatri ,maharjan menuka
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منبع
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پژوهش هاي خشكسالي و تغيير اقليم - 2024 - دوره : 2 - شماره : 6 - صفحه:1 -26
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چکیده
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Drought is often considered a silent disaster, leading to food and water shortages, displacement, and even conflict. although evidence of ongoing climate change has been observed, limited research is carried out on drought conditions in gandaki river basin of nepal. this study analyzed four indices i.e., normalized difference vegetation index (ndvi), normalized difference water index (ndwi), land surface temperature (lst) and normalized difference drought index (nddi) for january and november between 1991 and 2021 by using geographic information system (gis) and remote sensed data. ndvi showed that dense vegetation decreased by 93.26% and built-up area increased by 96.88% in january compared between 1991 and 2021. compared between 1991 and 2021, ndwi showed that the high water stressed area increased by 49.5% in january. nddi showed increased in abnormally drought area in january (164.03%) compared between 1991 and 2021.both climate change and human activities significantly contributes increasing trend of drought over the 30-year period in gandaki river basin. the study suggests exploring the potential of modern tools such as gis and remote sensing for prediction of drought and monitoring its impact on ecosystems and human. this will be beneficial for policy makers for developing the strategy for combating drought and climate change.
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کلیدواژه
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climate change ,ndvi ,ndwi ,nddi ,lst
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آدرس
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tribhuvan university, ins titute of fores try, hetauda campus, nepal, tribhuvan university, ins titute of fores try, pokhara campus, pokhara, nepal, agriculture and fores try university, college of natural resource management (cnrm), nepal, tribhuvan university, ins titute of fores try, hetauda campus, nepal, tribhuvan university, school of fores try and natural resource management, institute of fores try, ins titute of fores try, hetauda campus, nepal
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پست الکترونیکی
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menuka48maharjan@gmail.com
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evaluation of drought in gandaki river basin, nepal
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Authors
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bhattarai aayush ,timilsina sachin ,ayer santosh ,paudel gayatri ,maharjan menuka
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Abstract
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drought is often considered a silent disaster, leading to food and water shortages, displacement, and even conflict. although evidence of ongoing climate change has been observed, limited research is carried out on drought conditions in gandaki river basin of nepal. this study analyzed four indices i.e., normalized difference vegetation index (ndvi), normalized difference water index (ndwi), land surface temperature (lst) and normalized difference drought index (nddi) for january and november between 1991 and 2021 by using geographic information system (gis) and remote sensed data. ndvi showed that dense vegetation decreased by 93.26% and built-up area increased by 96.88% in january compared between 1991 and 2021. compared between 1991 and 2021, ndwi showed that the high water stressed area increased by 49.5% in january. nddi showed increased in abnormally drought area in january (164.03%) compared between 1991 and 2021.both climate change and human activities significantly contributes increasing trend of drought over the 30-year period in gandaki river basin. the study suggests exploring the potential of modern tools such as gis and remote sensing for prediction of drought and monitoring its impact on ecosystems and human. this will be beneficial for policy makers for developing the strategy for combating drought and climate change.
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Keywords
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climate change ,ndvi ,ndwi ,nddi ,lst
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