International Journal of Engineering Research in Electronics and Communication Engineering

A Conceptual Model Based Approach to Assess the Hydrologic Processes in Dakshin Dinajpur district of West Bengal, India

Author : Rupak Kumar Paul ¹

Date of Publication :22nd November 2017

Abstract: The lumped version of HBV model was calibrated for areas comprising five adjacent catchments to which the district Dakshin Dinajpur is nested. With the calibrated parameter the model was applied to the district to simulate the components of hydrological system (e.g. runoff, actual evaporation, groundwater recharge etc.,) and subsequently multiple linear regression analysis was done to assess the impact of natural and human factors, if any, on each component with a view to having a comprehensive understanding of behavior of hydrologic system pertaining to the district. To substantiate the output of regression analysis Mann-Kendall test was applied to observe whether the trend in explanatory variables, if any, correspond to that in response variables. It is observed that in last sixteen years on an average there is no change in monsoon rainfall while non-monsoon rainfall is decreasing gradually that causes reduction in annual runoff by about 31.93% with respect to its estimated value in the base year 2000. Direct runoff is decreasing at the rate of 6.84 mm per year. There is no change in groundwater recharge that comes from monsoon rainfall through the base flow is declining over the time at the rate of 6.73 mm per year and this can be attributed to increasing withdrawal of groundwater for irrigation use in a lean season so far as the result of regression analysis indicates. Thus, two factors â€“ rainfall and groundwater based irrigation â€“ have been proved statistically to be capable of explaining the changing behavior of hydrologic processes in the district

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