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为评估降水分布指数模型(DPEM)的精度问题,基于圣卡塔利娜岛4场次降雨7个观测站点的实测数据,分别运用距离倒数加权插值模型(IDW)、修正距离倒数插值模型(RIDM)、空间线性插值模型(SLIM),通过交叉验证,比较了四种模型的插值精度。结果表明,对不同验证站进行插值时,各方法呈现不同特征。验证站位于样本地理分布边缘时,SLIM、IDW模拟误差有增大趋势;RIDM考虑高程作为权重因子后,模拟结果优于IDW;而DPEM模拟产生的误差更小,且能够反映降水中心的趋势位置。该评估比较对降水分布指数模型在降水数据输入时有指导意义。
In order to evaluate the accuracy of DPEM model, based on the measured data of seven observation stations in four rains in Santa Catalina Island, the distance reciprocal weighted interpolation model (IDW), the modified distance reciprocal interpolation model (RIDM) , Spatial linear interpolation model (SLIM), and compared the accuracy of interpolation of the four models by cross-validation. The results show that the methods presented different characteristics when interpolating different verification stations. The simulated errors of SLIM and IDW tended to increase when the verification station was located at the edge of the sample geography distribution. The simulation results were better than IDW when RIDM considered the elevation as the weighting factor. However, the error generated by DPEM simulation was smaller and could reflect the trend location of precipitation center . This assessment compares the precipitation distribution index model with the guidance of rainfall data input.