Groundwater Drought Index (GWDI) is recognized as one of the key Hydrological Indices of drought. But the evolution of drought from meteorological to hydrologic drought is not instantaneous and is dominated by several physical mechanisms. In Kerala due to heterogeneity of terrain, the occurrences of drought at different temporal and spatial scales do not fit into the broad indices of standard GWDI. Hence drought prediction has become a major challenge to decision and policy makers as it fails to address multiple causative factors to recognize the actual ground realities. This paper is an effort to bring out the meteorological, hydrogeological and hydrological factors based on which an attempt has been made to review the groundwater drought index to suggest an improved groundwater deficit class by studying the extreme climate eventualities during 2016 (drought) and 2018 (flood). The progression of drought and its corresponding effect on groundwater regime in Chaliyar river basin has been studied in detail. Based on the typical response of drought conditions in different physiographic zones, a modified GWDI from the case study is proposed.
Precepts for Groundwater Drought Index in Kerala: A Case Study from Chaliyar River Basin
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Groundwater Drought Index (GWDI) is recognized as one of the key Hydrological Indices of drought. But the evolution of drought from meteorological to hydrologic drought is not instantaneous and is dominated by several physical mechanisms. In Kerala due to heterogeneity of terrain, the occurrences of drought at different temporal and spatial scales do not fit into the broad indices of standard GWDI. Hence drought prediction has become a major challenge to decision and policy makers as it fails to address multiple causative factors to recognize the actual ground realities. This paper is an effort to bring out the meteorological, hydrogeological and hydrological factors based on which an attempt has been made to review the groundwater drought index to suggest an improved groundwater deficit class by studying the extreme climate eventualities during 2016 (drought) and 2018 (flood). The progression of drought and its corresponding effect on groundwater regime in Chaliyar river basin has been studied in detail. Based on the typical response of drought conditions in different physiographic zones, a modified GWDI from the case study is proposed.
Publication Mode |
Online |
---|---|
Publication Author |
Lal Thompson, Thomas Scaria, Prathibha Raveendran |
Publication Language |
English |
Publication Type |
Conference Paper |
Publication Year |
2021 |
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