杭州市城区不同降水时间尺度下面雨量计算方法比较

The comparative analysis of surface precipitation calculation methods under different rainfall time scales in Hangzhou

基于地理信息系统(ArcGIS)技术,采用4种方法对杭州主城区的18个自动站2012—2013年不同时间尺度的降雨数据进行面雨量估算,并对结果的精度进行比较分析。结果表明:4种面雨量计算方法各有优势,二次曲面法能够有效体现杭州市区暴雨降水的空间分布受地形因素的影响,模拟的面雨量结果更精确;根据4种插值结果的相对误差百分比值可知,不同降水时间尺度模拟的结果精度存在差异,总体上看,降水时间尺度越大,模拟的效果越精确。

Based on the geographic information system (ArcGIS)technology,four methods were used to evaluate surface rainfalls obtained from 18 automatic stations in Hangzhou urban area under different time scales from 2012 to 2013,and the accuracy of the results was also comparatively analyzed.The results showed that each method using for the calculation of surface rainfall had its particular advantages.The quadric surface method effectively reflected the effect of topographic factors of Hangzhou on spatial distribution of storm rainfall,leading to a high accuracy for the simulation results of surface precipitation.According to the rela-tive error percentage of four interpolation results,the accuracy of the simulation results obtained under different rainfall time scales was different.In general,the larger the precipitation time scale,the more accurate the simulation effect.