多卫星遥感降水产品在柬埔寨的应用比较分析

Application analysis on remote sensing precipitation datasets in Cambodia

柬埔寨地区的水资源十分丰富,但由于气象、水文站点的稀缺以及水文气象数据的不连续等原因,导致流域基本水雨情及水资源特征数据不够完善、全面和准确,不利于该国水资源的科学管理和开发利用。一系列高时空分辨率的遥感降水产品的出现为降水数据的缺失和不连续提供了新的解决方法。选取了5种高精度的遥感降雨数据(CHIRPS、CMORPH_CRT、CMORRPH_BLD、MSWEP、TRMM)对柬埔寨地区2003~2015年降雨的时空分布差异、精度评价、极端降雨估计情况进行了对比分析。结果表明,5组遥感降雨产品总体均能较好地反映柬埔寨地区降雨的时间及空间变化规律。这对于柬埔寨及其它无资料地区的水资源研究及工程设计工作具有一定的指导作用。

Cambodia is rich in water resources,but sparse in weather and rainfall stations and the discontinuity of hydrological and meteorological data lead to data incomplete and inaccurate of basic rainfall-flood regime and water resources characteristics,which is not conducive to the scientific management and exploitation of water resources in the country.However,a series of high-temporal and spatial resolution remote sensing precipitation datasets provide new resolution for this problem.In this study,five high-precision remote sensing precipitation datasets(including CHIRPS,CMORPH_CRT,CMORRPH_BLD,MSWEP,and TRMM)are selected to analyze and compare the spatio-temporal difference of rainfall,assessment of accuracy and forecast of extreme rainfall in Cambodia during 2003-2015.The results show that the five datasets can generally capture the spatial and temporal variation of rainfall in Cambodia,which has a certain guidance for the water resources research and engineering design in Cambodia and other ungauged regions.