INVESTIGATION OF THE VARIABILITY OF SPI AND SPEI DROUGHT INDICES USING DISCRETE WAVELET TRANSFORMATION IN CONJUNCTION WITH THE MANN KENDALL TEST
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Date
2021
Journal Title
Journal ISSN
Volume Title
Publisher
COLLEGE OF AGRICULTURAL ENGINEERING AND TECHNOLOGY ANAND AGRICULTURAL UNIVERSITY GODHRA
Abstract
Drought is the most perplexing hydro-meteorological hazard, which occurs due to
climate change and happens in all climate zones. A common method for the evaluation
of drought condition is the historical analysis of drought indices, in which trend
detection and analysis assumes a significant job. The presence of trends in drought
condition is an indication of potential climate fluctuation and environmental change.
The identification of such trends is essential for the planning and design of sustainable
water resources. The primary reason of the trend assessment is to discover what time
scales are influencing the trends. This study presents an analysis of drought variability
in the middle Gujarat region for the time span of 1986-2015. As a measure of drought
intensity, standardized precipitation index (SPI) and standardized precipitation
evapotranspiration index (SPEI) were investigated seasonally and annually. Mann Kendall (MK) test was applied to recognize the trends and Sen’s slope estimator was
used to calculate the magnitude of trend.