水利学报2017，Vol.48Issue(10)：1147-1156,10.DOI:10.13243/j.cnki.slxb.20170202
新一代GPM IMERG卫星遥感降水数据在中国南方地区的精度及水文效用评估
Evaluation on the accuracy and hydrological performance of the latest-generation GPM IMERG product over South China
摘要
Abstract
Latest-generation GPM (Global Precipitation Measurement) IMERG (Integrated Multi-satellitE Retrievals for GPM) satellite-based precipitation quantitative estimation products provide a new source of precipitation data.This study evaluates the accuracy and performance of the near-real-time “early run” and “late run” IMERG products (here after IMERG-E and IMERG-L) and the post-real-time “final run” IMERG product (here after IMERG-F) and evaluates the hydrological performance of the three IMERG products with the VIC (Variable Infiltration Capacity) distributed hydrological model during 2014-2016 over the Beijiang River Basin,a mid-size basin in South China.The results show that:(1) The post-real-time IMERG-F product presents acceptable accuracy over the study area,with relatively high daily CC (correlation coefficient) of 0.65 at the gridcell scale,relatively low BIAS (relative bias) of 5.87％,while the accuracy of the near-real-time IMERG-E and IMERG-L products is relatively poorer but is still satisfactory,with CCs of approximately 0.6;performances of the 3 products are apparently improved at the basin scale.(2) Under the scenario I (VIC model calibrated by gauge data) in the hydrological simulation evaluation,post-real-time IMERG-F product presents satisfactory hydrological performance,with high NSCE (Nash-Sutcliffe Coefficient of Efficiency) of 0.622;by comparison,near-real-time IMERG-E and IMERG-L present poorer hydrological performance,but perform well specially during the flood season (May to September) of 2015,indicating that the potential for the flood forecasting of the near-real-time IMERG products;(3) Under the scenario Ⅱ (model recalibrated by the TMPA 3B42-V7 data),hydrological performances of the three IMERG products are all significantly improved,indicating that the 3B42 data is suitable for the model calibration when simulating with the IMERG products.关键词
卫星遥感降水数据/GPM IMERG/水文效用/VIC水文模型/北江流域Key words
satellite-based precipitation product/GPM IMERG/hydrological utility/VIC hydrological model/Beijiang River Basin分类
信息技术与安全科学引用本文复制引用
陈晓宏,钟睿达,王兆礼,赖成光,陈家超..新一代GPM IMERG卫星遥感降水数据在中国南方地区的精度及水文效用评估[J].水利学报,2017,48(10):1147-1156,10.基金项目
国家自然科学基金项目(51579105,91547202) （51579105,91547202）
广州市科技计划项目(201707010072) （201707010072）
广东省科技计划项目(2017A040405020) （2017A040405020）
