Comparison of performance of SWAT and SIMHYD models in simulation of stream flow from Hidkal dam catchment area of India under present and future scenarios

Comparison of performance of SWAT and SIMHYD models in simulation of stream flow from Hidkal dam catchment area of India under present and future scenarios

A study was conducted to compare the performance of SWAT and SIMHYD models in prediction of stream flow from the catchment of Hidkal dam of Karnataka in India for present and future scenarios. SWAT and SIMHYD models were used for the present study and calibrated with SWAT-CUP and generic algorithm respectively. The performance of models were tested with Nash Sutcliffe Efficiency (NSE), RMSE observations standard deviation ratio (RSR), Coefficient of Determination (R2) and Per cent Bias (PBIAS). The SWAT model performed well and very good agreement between monthly observed and simulated stream flows with R2, NSE, RSR and PBIAS as 0.84, 0.76, 0.49 and 23.8% respectively during calibration periods and 0.93, 0.83, 0.41 and 22.9 % respectively during validation period. SimHYD model also performed well and the NSE and correlation coefficient was found to be 0.77 and 0.93 during calibration period and 0.90 and 0.95 during validation period respectively. This study revealed that both models performed well in simulation of monthly stream flow during calibration and validation periods. The stream flows simulated with SimHYD were compared with stream flows simulated with SWAT model and found that very good agreement between two model outputs. This study concluded that SimHYD model could be used to simulate the stream flow when data limitation.

进行了一项研究，以比较SWAT和SIMHYD模型在印度卡纳塔克邦希德卡尔大坝集水区当前和未来情景下对河流流量预测的性能。本研究使用了SWAT和SIMHYD模型，并分别使用SWAT - CUP和通用算法进行校准。通过纳什 - 萨特克利夫效率（NSE）、均方根误差观测标准差比率（RSR）、决定系数（R²）和百分比偏差（PBIAS）对模型性能进行了测试。SWAT模型表现良好，在校准期间，月观测流量和模拟流量之间的一致性非常好，R²、NSE、RSR和PBIAS分别为0.84、0.76、0.49和23.8%，在验证期间分别为0.93、0.83、0.41和22.9%。SIMHYD模型也表现良好，在校准期间，NSE和相关系数分别为0.77和0.93，在验证期间分别为0.90和0.95。这项研究表明，两个模型在校准和验证期间对月河流流量的模拟都表现良好。将SIMHYD模拟的河流流量与SWAT模型模拟的河流流量进行比较，发现两个模型的输出之间一致性非常好。这项研究得出结论，当数据有限时，可以使用SIMHYD模型来模拟河流流量。