基于卫星遥感数据和SPA的淮河流域陆地水储量变化研究

Research on terrestrial water storage anomaly based on satellite remote sensing data and set pair analysis in Huaihe River Basin

为研究流域陆地水储量多年变化情况,以淮河流域为例,利用2003-2016年GRACE重力卫星数据反演流域陆地水储量变化,分析其多年时空变化规律;利用MODIS遥感数据生成归一化植被指数NDVI,通过皮尔逊相关系数和SPA集对分析,结合降雨、温度、径流、NDVI和环流数据分析陆地水储量变化的主要影响因子。结果表明:GRACE反演的淮河流域陆地水储量整体呈现微弱下降趋势,具有年周期性,秋季初期达到峰值;流域南部桐柏山和大别山区域陆地水储量上升,北部流域内的郑州区域陆地水储量显著下降;陆地水储量变化与温度相关度较低,主要受降雨、径流变化影响,呈正相关,受当地植被归一化指数和环流指数影响相对较小,呈负相关。

The GRACE satellites data from 2003-2016 in the Huaihe River basin were used to study the long-term spatiotemporal changes of terrestrial water storage anomaly(TWSA).The normalized difference vegetation index(NDVI)generated from MODIS remote sensing satellite was used to analyze the main influencing factors of TWSA,including precipitation,temperature,runoff,vegetation coverage and circumfluence,using the Pearson analysis and set pair analysis(SPA).The results showed that the TWSA in the Huaihe River basin has a clear annual periodicity,and reaches its peak in the early autumn.The TWSA over the south of the basin,especially in Tongbai and Dabie Mountain area increased in 2016,while in the north of the basin,such as Zhengzhou area decreased significantly.The TWSA in Huaihe basin is positively affected by precipitation and runoff and has a low correlation with temperature.Additionally,the influence of local NDVI and circumfluence index on TWSA is relatively small,showing a negative correlation.