Swat based runoff and sediment yield modelling for upper Shivnath basin
Loading...
Date
2020-01
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The study was undertaken with the major objectives of calibrating and validating the Soil and Water Assessment Tool (SWAT) model to simulate surface runoff and sediment yield for the Upper Shivnath basin. The meteorological and hydrological data are used from 1990 to 1994 for warmup period, 1995 to 2005 for calibration period and 2006 to 2013 for validation period. The developed SWAT model accurately simulated runoff and sediment yield of Upper Shivnath basin. The Soil and Water Assessment Tool based Wavelet Multilayer Perceptron (SWAT-WMLP), Soil and Water Assessment Tool based Wavelet Support Vector Machine (SWAT-WSVM), Soil and Water Assessment Tool based Wavelet Multilayer Perceptron-Genetic Algorithm (SWAT-WMLP-GA) and Soil and Water Assessment Tool based Wavelet Support Vector Machine-Genetic Algorithm (SWAT-WSVM-GA) accurately simulated runoff and sediment yield in comparison to SWAT model. Three different statistical downscaling methods namely delta method (DM), quantile mapping method (QMM) and empirical quantile mapping method (EQMM) were used for downscaling precipitation. Delta method performed better than quantile mapping and empirical quantile mapping methods for downscaling of rainfall at all gauging stations. Impact assessment of climate change during 2020-2039, 2040-2059, 2060-2079 and 2080-2099 scenarios shows that runoff and sediment yield of most of sub-basins will slightly decrease in future. The effect of land use change on runoff and sediment yield were assessed using future use land of 2025, 2045, 2065 and 2085 periods. It was showed that the urban land will increase by 44.56 % during 2025, 71.06 % during 2045, 95.33 % during 2065 and 134.12% during 2085 respectively, while agriculture land will decrease by 2.10 % during 2025, 3.35 % during 2045, 4.49 % during 2065 and 6.30 % during 2085. The surface runoff and sediment yield will increase during 2020-2039, 2040-2059, 2060-2079 and 2080-2099 future scenarios due to impact of land use change.
Description
Keywords
null