TY - JOUR

T1 - Hydrologic modeling for the gandak basin using swat with sensitivity considerations

AU - Haldar, Raktim

AU - Singla, Shivika

AU - Singla, Rumani

AU - Rajeev, Rudraksh

AU - Khosa, Rakesh

PY - 2014/4/1

Y1 - 2014/4/1

N2 - The advances in computer technology have revolutionized the world of water resources management. One such development, ArcSWAT provides a GIS integrated user-friendly platform, which allows the effective use of spatial data to enhance the modelling capabilities. The objective of this study is to apply and validate the SWAT model on a river basin, Gandak, which originates from the Himalayan ranges in Nepal and flows into India forming a tributary of the Gangetic system. Two popular gridded observation precipitation datasets from: (1) Asian Precipitation Highly Resolved Observational Data Integration Towards the Evaluation of Water Resources (APHRODITE), and (2) India Meteorological Department (IMD) were used to simulate runoff. The comparison of the outputs from both the data reveals that the APHRODITE data gives relatively better results. However, the model results show further improvement when run using an amalgam of both the data. The SWAT delineated model was run initially with default parametric values and the simulated river flow was compared with the observed runoff data at Triveni, which is the entry point of the river at the Indo - Nepal border. After performing sensitivity analysis of all the relevant model parameters, the model was calibrated both manually and automatically, using two methods in SWAT-CUP, viz. SUFI2 and PARASOL. Nash-Sutcliffe coefficient and Root Mean Square error are used to evaluate the efficiency of the model. Comparative analysis of the influence of the subbasin, soil and aquifer properties, one at a time, was done by manually calibrating the corresponding parameters. The study reveals that the Temperature lapse rate (TLAPS) is the key governing factor in the sensitivity analysis as well as during calibration. From the results, it can be concluded that SWAT model has the capability to successfully capture and mimic the intricacies involved in the runoff generation process for the considered study area.

AB - The advances in computer technology have revolutionized the world of water resources management. One such development, ArcSWAT provides a GIS integrated user-friendly platform, which allows the effective use of spatial data to enhance the modelling capabilities. The objective of this study is to apply and validate the SWAT model on a river basin, Gandak, which originates from the Himalayan ranges in Nepal and flows into India forming a tributary of the Gangetic system. Two popular gridded observation precipitation datasets from: (1) Asian Precipitation Highly Resolved Observational Data Integration Towards the Evaluation of Water Resources (APHRODITE), and (2) India Meteorological Department (IMD) were used to simulate runoff. The comparison of the outputs from both the data reveals that the APHRODITE data gives relatively better results. However, the model results show further improvement when run using an amalgam of both the data. The SWAT delineated model was run initially with default parametric values and the simulated river flow was compared with the observed runoff data at Triveni, which is the entry point of the river at the Indo - Nepal border. After performing sensitivity analysis of all the relevant model parameters, the model was calibrated both manually and automatically, using two methods in SWAT-CUP, viz. SUFI2 and PARASOL. Nash-Sutcliffe coefficient and Root Mean Square error are used to evaluate the efficiency of the model. Comparative analysis of the influence of the subbasin, soil and aquifer properties, one at a time, was done by manually calibrating the corresponding parameters. The study reveals that the Temperature lapse rate (TLAPS) is the key governing factor in the sensitivity analysis as well as during calibration. From the results, it can be concluded that SWAT model has the capability to successfully capture and mimic the intricacies involved in the runoff generation process for the considered study area.

KW - Arc SWAT

KW - Calibration

KW - Gandak river basin

KW - Rainfall

KW - Sensitivity analysis

KW - Surface run-off

KW - Validation

UR - http://www.scopus.com/inward/record.url?scp=84928238858&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:84928238858

VL - 7

SP - 448

EP - 455

JO - International Journal of Earth Sciences and Engineering

JF - International Journal of Earth Sciences and Engineering

SN - 0974-5904

IS - 2

ER -