Abstract:
Adoption of mathematical models for evaluation of hydrology of watershed is most popular and prevailing trend. The most trending techniques in present time, to derive out the information related to watershed, are GIS and Remote Sensing. SWAT is a universal, semi distributed, mathematical river basin model that needs a number of input parameters. In the present study, the model is implemented for gaining knowledge of hydrological behavior of the study area which is lying between Suni to Kasol in the state of Himachal Pradesh, India. For model calibration, daily observed while for validation data from 1999 to 2011 have been used. The applicability of SWAT model is assessed by using various graphical and statistical methods which helped to determine the ability of the model in simulating the runoff for the study basin of Satluj river (Suni to Kasol). SWAT CUP is one of the new developments for calibration/uncertainty analysis of watershed models. It gives an effective graphical interface for depicting outputs, together with simulated data, observed data, best fit model results and 95PPU for all variables used in model calibration. SUFI 2 procedure is effective but need more iterations as well as modification of the parameter allowing users to adopt different measures and objective functions. This approach has been used in the present study. The model is calibrated by using eleven most sensitive parameters namely , ALPHA , ESCO, GW , SOL , GW . The calibration period reported the R for daily runoff was derived 0.99 with Nash the validation period. It shows the effectiveness and appropriateness of the SUFI 2 method for the study area. As per It is required to attain spatial, soil and hydro meteorological database for the study by installing the Automatic Weather Stations (AWS) to measure more accurate precipitation, temperature and other climatic variables at various locations. The results of non parametric approach indicates that during monsoon season there is rising trend in rainfall at both stations. The rainfall is found to be falling during the pre monsoon, post monsoon and winter season.
