水利学报2025，Vol.56Issue(12)：1620-1632,13.DOI:10.13243/j.cnki.slxb.20250087
卫星与再分析降水产品在无测站区域的精度评价与多源融合
Accuracy assessment and multi-source fusion of satellite and reanalysis precipitation products for ungauged region
摘要
Abstract
Satellite and reanalysis precipitation products can provide critical spatial information for ungauged regions However,due to the absence of ground observations,the accuracy assessment and multi-source fusion of precipita-tion products still face challenges.Triple collocation(TC)is a classical method that does not rely on ground obgerva-tion data,but it is only opplicable to continuous variables and cannot reduce classification errors between rain and no-rain events.This study proposes a novel CTC-TC framework by integrating categorical triple collocation(CTC)with TC,enabling comprehensive accuracy assessment and multi-source fusion of precipitation products for ungauged regions.Using the Poyang Lake and Dongting Lake basins as study areas,a systematic investigation was conducted on five representative precipitation products.Results demonstrate that the CTC-TC framework success-fully ranked the rainfall detection capabilities of evaluated products and accurately estimating correlation coefficients and root mean square errors for satellite-based products.For multi-source fusion,the integration of ERA5-Land,SM2RAIN-ASCAT,and GSMaP-MVK achieved optimal accuracy in multi-source precipitation fusion,demonstrat-ing Critical Success Index(CSI)and modified Kling-Gupta Efficiency(KGE')values of 0.60 and 0.49,respec-tively.These metrics match or exceed the performance of the best parent product.Compared to Bayesian Model Aver-aging,CTC-TC improved mean CSI and KGE'values by over 31.2%and 6.3%,respectively.The proposed CTC-TC framework enriches the methodology for accuracy assessment and multi-source fusion of precipitation products,dem-onstrating great potential for application in ungauged regions.关键词
无测站区域/三元搭配/精度评价/多源融合/湖泊水域Key words
ungauged region/triple collocation/accuracy assessment/multi-source fusion/lake orrea分类
天文与地球科学引用本文复制引用
李伶杰,刘勇,彭志鑫,王银堂,王磊之,苏鑫..卫星与再分析降水产品在无测站区域的精度评价与多源融合[J].水利学报,2025,56(12):1620-1632,13.基金项目
国家重点研发计划项目(2022YFC3202802) （2022YFC3202802）
国家自然科学基金项目(52009081) （52009081）
