摘要
本文采用GIS栅格插值的常用方法,反距离权重法(IDW),样条函数法(Spline),克里金法(Kriging),协同克里金法(Co-Kriging),泰森多边形法(Thissen)对2013年7月8~11日都江堰特大暴雨过程进行面雨量计算的对比分析,并用FLood Area模型对此次过程中白沙河流域的暴雨洪涝过程进行模拟,结果显示:5种面雨量计算方法的结果受雨量站密集程度和降水空间分布特征的制约,特别是样条函数法和泰森多边形法,对雨量站分布影响较为敏感;小时面雨量计算中站点分布对样条函数法影响更大;协同克里金法计算面雨量可使FLood Area模拟结果更优,更接近于真实值;在复杂地形条件下面雨量计算中,考虑地形的相关影响可有效提高降水插值精度,使Flood Area模型的模拟结果误差更小。
Surface rainfall calculation of heavy rainfall process in Dujiangyan during July 8 ～11, 2013 are compared and analyzed by use of GIS common method of grid interpolation, inverse distance weighting （IDW） , spline tunction method （Spline）, Kriging, Co - kriging, Tyson polygon method （Thissen）. And FLoodarea model is used to simulate the flood process of Baisha River Basin. The results indicate that the 5 methods tor calculating surface rainfall are restricted by the intensity of rainfall stations and the spatial distribution characteristics of precipitation. In particular the Spline and the Thissenare more sensitive to the distribution of rainfall stations. In the calculation of hourly rainfall, the distribution of sites has greater influence on the Spline. Co - Kriging method can make the FLoodarea＇s simulation results are better and closer to the true value. The interpolation accuracy of precipitation can be ettectively improved and makes the enor of Floodarea model simulation smaller by considering the relative influence of topographyin the rainfall calculation under complex tenain conditions.
作者
邓国卫
王敏
DENG Guowei;WANG Ming(Heavy Rain and Drought FloodDisasters in Plateau and Basin Key Laboratory, Chengdu 610071, China;Sichuan Climate Center, Chengdu 610071, China;Ganzi Meteorological Bureau, Kangding 626000, China)
出处
《高原山地气象研究》
2018年第1期81-86,95,共7页
Plateau and Mountain Meteorology Research
基金
中国气象局预报员专项(CMAYBY2017-064)
