2003—2022年长江流域水储量变化时空特征研究  

Study on temporal and spatial characteristics of water storage variation in Yangtze basin from 2003 to 2022

作　　者：张放 文汉江[1] 刘焕玲[1] 蔺文奇 杨蔚然 ZHANG Fang;WEN Hanjiang;LIU Huanling;LIN Wenqi;YANG Weiran(Chinese Academy of Surveying&.Mapping,Beijing 100036,China;School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China)

机构地区：[1]中国测绘科学研究院,北京100036 [2]武汉大学测绘学院,武汉430079

出　　处：《测绘科学》2023年第5期51-57,103,共8页Science of Surveying and Mapping

基　　金：国家高端外国专家引进计划项目(G2021055004L);DAAD战略合作伙伴与专题研究合作网络项目“现代空间大地测量技术用于全球变化监测”(57421148);中国测绘科学研究院基本科研业务费项目(AR2126)。

摘　　要：针对探究长江流域内水储量变化的时空特征对水资源管理、灾害预防的重要意义,该文利用GRACE、GRACE-FO数据和水文资料采用主成分分析算法进行了研究。2003年以来,长江流域水储量呈现增多的趋势,在2003年1月—2017年7月以2.75±0.62 mm/a的速率上升,在2018年6月—2022年1月以0.54±2.19 mm/a的速率上升,上升速率变缓。主成分分析结果表明,长江流域水储量变化以年周期性信号为主,最明显年周期性信号出现在金沙江流域下游;第三主成分反映了小于一年周期的信号,对应的特征向量在2003年1月—2017年7月和2018年6月—2022年1月存在较大差异,导致这种变化的原因可能与极端气候事件有关。The Yangtze River basin is an important economic region in China.Therefore,it is important for water resources management and disaster prevention to quantify the spatial and temporal characteristics of changes in water storage the basin.To investigate the spatial and temporal characteristics of water storage changes in the basin,this work used GRACE,GRACE-FO and hydrological data and the principal component analysis algorithm was applied to analysis.Since 2003,water storage in the Yangtze River basin has shown an increasing trend,with a rate of 2.75±0.62 mm/a from January 2003 to July 2017,and a slower rate of 0.54±2.19 mm/a from June 2018 to January 2022.The results of the principal component analysis show that the changes in water storage in the Yangtze River basin are dominated by annual cyclic signals,with the clearest annual cyclic signals occurring in the lower reaches of the Jinsha River Basin.The third principal component reflects signals with cycles of less than one year,and the corresponding eigenvectors differ significantly from January 2003 to July 2017 and from June 2018 to January 2022,and the reason for this variation may be related to extreme weather events.

关 键 词：GRACE GRACE-FO 长江流域 主成分分析 

分 类 号：P228[天文地球—大地测量学与测量工程]