Assessment of Water Balance of Pasak River Basin Using SWAT and MIKE-HYDRO Basin Models
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Abstract
This research examines the assessment of water balance of Pasak River Basin by using SWAT and MIKE-HYDRO Basin models. The SWAT model was applied to estimate hydrological characteristics while the MIKE-HYDRO Basin model was used for evaluating the outcomes of water management system in the watershed, such as water diversion between reservoirs and water allocation for irrigation and domestic and industrial consumptions. The daily data of precipitation, temperature, relative humidity, wind velocity and solar radiation throughout 32 years (1985–2016) were used. The SWAT model was set up to estimate runoff, recharge, base flow and groundwater. Water requirements for all activities in the area were applied as inputs of MIKE-HYDRO Basin model in order to simulate water balance of hydrological cycle in the area. Observed runoffs at 6 measuring points were compared to the results from the models. It was found that the results of model calibration provided Coefficient of Determination (R2) and Nash-Sutcliffe Efficiency (NSE) of 0.60–0.96 and 0.55–0.91, respectively. However, the R2 and NSE from the results of model validation were higher than those of the model calibration at every measuring point. In conclusion, the water balance of the hydrological cycle in Pasak basin presented 17,224.0 mcm/yr of average total rainfall, 9,163.2 mcm/yr of evapotranspiration, 6,232.3 mcm/yr of surface water and 1,828.0 mcm/yr of groundwater. As a result, the use of SWAT in conjunction with MIKE-HYDRO basin model contributes to improved performance of hydrological models. The implications would considerably benefit further studies on the analysis of drought and flood situations in each area.
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