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Authors
Affiliations
1 Western Himalayan Regional Centre, National Institute of Hydrology, Jammu & Kashmir, IN
2 Department of Hydrology, Indian Institute of Technology Roorkee, Uttarakhand, IN
3 Department of Water Resources Development and Management, Indian Institute of Technology Roorkee, Uttarakhand, IN
4 Indian Institute of Remote Sensing, ISRO, Dehradun, Uttarakhand, IN
Source
International Journal of Innovative Research and Development, Vol 5, No 3 (2016), Pagination: 197-204
Abstract
In this study, direct runoff hydrograph (DRH) is derived by defining the Nash GIUH parameters in terms of the lag time of the watershed, rather than velocity used in conventional GIUH approach. The proposed approach is tested for its applicability on several isolated rainfall-runoff events of a Himalayan watershed (Gagas watershed within Ramganga basin) located in Uttarakhand state of India. The DRHs derived by the proposed approach were found to be in good agreement (average Nash and Sutcliffe Efficiency (NSE) = 83.2% and relative error (RE) in peak = 5.4%) with the observed DRHs. The proposed approach was also compared with kinematic wave-based GIUH approach and the results of the former approach were found superior to the later. Furthermore, to overcome the complexity involved in manual estimation of geomorphological parameters, an approach based on Melton number and geomorphological information system (GIS) is also proposed and found to be simple and easy-to-use.
Keywords
GIS, GIUH, ILWIS, Lag Time, Nash Model, SRTM DEM.
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