武汉市GRACE水储量变化与气象干旱关联趋势分析  

GRACE water-storage variation and drought tendency analysis in Wuhan City

作　　者：谢萍[1] 张双喜[2,3] 金涛勇[2,3] 韦瑜 蔡剑锋 许晨 XIE Ping;ZHANG Shuangxi;JIN Taoyong;WEI Yu;CAI Jianfeng;XU Chen(Wuhan Central Meteorological Observatory,Wuhan,Hubei 430074,China;School of Geodesy and Geomatics,Wuhan University,Wuhan,Hubei 430079,China;Key Laboratory of Geospace,Environment and Geodesy,Ministry of Education,Wuhan University,Wuhan,Hubei 430079,China;Bureau of Geophysical Prospecting Inc.,China National Petroleum Co.,Zhuozhou,Hebei 072750,China)

机构地区：[1]武汉中心气象台,湖北武汉430074 [2]武汉大学测绘学院,湖北武汉430079 [3]武汉大学地球空间环境与大地测量教育部重点实验室,湖北武汉430079 [4]中国石油集团东方地球物理勘探有限责任公司,河北涿州072750

出　　处：《排灌机械工程学报》2023年第6期624-629,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家重点研发计划项目(2020YFC1512401);国家自然科学基金资助项目(41874169,42074176);武汉市政府示范项目(WHDYS-2018-006)。

摘　　要：通过GRACE时变重力异常反演等效水高,对比武汉站的降雨数据,估计武汉市区域水储量变化和气象干旱趋势.研究发现等效水高变化与降雨数据存在相关性,1 a周期吻合,仅相位滞后;在长周期2 a和4 a也有较好的一致性,表现为相位超前,而短周期短相关性较差.GRACE数据提炼的干旱指标GRACE-DSI反映了土壤水、层间水、地表水等陆地水的综合变化;标准化降雨指标SPI则主要反映了降雨和地表干旱情况,两者的结合更全面地反映了气象干旱程度.研究发现GRACE-DSI指标与SPI指标在2002年8月—2020年4月期间的相关性可以分为3个阶段:低相关性、高相关性、再降到低相关性的阶段.特别是在2013年6月—2020年4月,GRACE-DSI指标显示武汉市陆地水储量增加,干旱程度不断缓解,而SPI指标显示该期间多次发生降雨少、地表重度干旱的情况.Based on GRACE time-varying gravity to revise the equivalent water height by comparing the rainfall recorded at Wuhan Station,the water-storage variation of Wuhan City and drought tendency were evaluated.The study finds that there is a correlation between the change of equivalent water height and rainfall data,and cycle 1 a is consistent,only with phase lags.There is also a good consistency in the long-cycles of 2 a and 4 a,showing that the phase is advanced,and the short-term correlation is poor.The drought index GRACE-DSI extracted from GRACE data reflects the comprehensive changes of land water,such as soil water,interlayer water and surface water.On the other side,SPI mainly reflects rainfall and surface drought,and the combination of the two can further comprehensively reflect the degree of meteorological drought.According to the results,the correlation between GRACE-DSI index and the SPI index during the period from August 2002 to April 2020 can be divided into three stages:low correlation,high correlation,and then low correlation stage.Especially,during the period of June 2013 to April 2020,the groundwater in Wuhan gradually shows an increase based on GRACE-DSI index,and the drought degree continues to ease.However the SPI indicator shows that during this period,there are many occurrences of low rainfall and severe surface drought.

关 键 词：GRACE 干湿度指标 降雨 等效水高 武汉市 暴雨 时变重力 长江流域 

分 类 号：S271[农业科学—农业水土工程]