雨量插值方法对BTOPMC模型及洪水模拟的影响

Impacts of Precipitation Spatial Interpolation Methods on BTOPMC Model Parameters and Simulation Results of Flood

以BTOPMC为研究对象和平台,用最邻近插值法、算术平均法、引入面积权重的泰森多边形法、引入泰森多边形的距离反比加权法4种不同的降雨空间插值方法,对3个小流域进行了洪水模拟,分析了各插值方法对模型参数、模拟精度、洪水洪峰流量、峰现时间等的影响。结果表明:引入泰森多边形的距离反比加权法在各插值方法中表现较好,对各流域各场洪水洪峰流量的模拟精度较高,模拟洪峰时刻与其他几种方法相比更接近实测洪峰时刻;BTOPMC模型原有的最邻近插值法在对模型参数进行率定时Nash效率较高,但在验证时比另外3种插值方法低;引入面积权重的泰森多边形法在模拟中表现不稳定。

Baesd on BTOPMC,four different precipitation spatial interpolation methods,including nearest neighbor interpolation,the arithmetic average method,the introduction of area weighted Thissen polygon method,the introduction of Thiessen polygon inverse square of the distance weighted method were studied in three small watersheds.The impact of interpolation methods on the model parameters,simulation accuracy,the flood peak flow,the flood peak time and so on were analyzed.The results show that,the introduction of Thiessen polygon inverse square of the distance weighted method is the best one in all of interpolation methods.On the each basin,in the each flood,the simulation accuracy of the flood peak flow is higher,simulation of the flood peak time compared with other methods is more close to the measured flood peak time;the original nearest neighbor interpolation of BTOPMC modeling has a high efficiency of Nash efficiency in the parameter calibration,but Nash is lower than the other three interpolation in the parameters verification;the introduction of area weighted of Thissen polygon has a instability performance in the simulation.