利用ICESat-2激光测高监测和评估鄱阳湖水位变化特征  

Monitoring and assessing water level variation in Poyang Lake by ICESat-2 altimetry

作　　者：何明琴 金双根 张志杰[2] 郭孝祖 HE Mingqin;JIN Shuanggen;ZHANG Zhijie;GUO Xiaozu(School of Remote Sensing&Geomatics Engineering,Nanjing University of Information Science&Technology,Nanjing 210044,China;Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China)

机构地区：[1]南京信息工程大学遥感与测绘工程学院,南京210044 [2]中国科学院上海天文台,上海200030

出　　处：《南京信息工程大学学报》2024年第5期717-726,共10页Journal of Nanjing University of Information Science & Technology

基　　金：中科院先导A专项课题(XDA23040100);遥感科学国家重点实验室开放基金(OFSLRSS202111)。

摘　　要：ICESat-2卫星搭载了先进的光子计数激光测高仪,可实现对内陆中大型湖泊水位动态变化监测.本文利用ICESat-2卫星2018—2020年逐月的ATL13全球内陆水体数据估计和分析鄱阳湖水位变化特征,利用鄱阳湖湖口、星子和康山水文站实测数据进行验证和误差修正,并结合各测站水位数据、降雨量数据分析鄱阳湖水位动态变化及其成因.结果表明:1)鄱阳湖年内水位变化剧烈,具有明显的季节变化规律,6—10月为高水位期,其他月份为低水位期,水位高峰期出现在7—9月,总体水位呈上升趋势.2)ICESat-2测高水位与实测水位相关性R^(2)为0.846以上,经过误差修正后相关系数高达0.974.湖口站、星子站和康山站的均方根误差(RMSE)分别为1.660、1.073和0.836 m,经过误差修正重新计算后,三站RMSE分别为0.663、0.659和0.440 m,其测量精度提升约1 m.3)鄱阳湖水位变化与降雨量高度相关,1—2月和10—12月降雨量较少,为枯水期,水位下降;3—10月降雨量增多,为丰水期,水位上涨;降雨主要集中出现在7—9月,对应水位高峰期.The photon-counting laser altimeter on the Ice,Cloud and Land Elevation 2(ICESat-2)satellite offers a solution for tracking the dynamic water level variations in medium and large inland lakes.We utilize the monthly ATL13 global inland water data of ICESat-2 satellite from 2018 to 2020 to estimate and analyze the water level change in Poyang Lake.The measured data from Hukou,Xingzi and Kangshan hydrological stations are used for veri-fication and error correction,and the water level and rainfall data of each station are combined to analyze the dy-namic variation of Poyang Lake water level and reveal the underlying drivers.The results show that,the annual water level of Poyang Lake varied sharply with obvious seasonal variations and an overall upward trend;the high water lev-el period was from June to October,which peaked from July to September.The linear correlation coefficient of water levels between ICESat-2 and measured data is above 0.846,rising to 0.974 after error correction.The Root Mean Square Error(RMSE)is 1.660 m,1.073 m,and 0.836 m for Hukou,Xingzi,and Kangshan stations,respectively;error correction and recalculation can decrease the RMSE to 0.663 m,0.659 m,and 0.440 m for Hukou,Xingzi,and Kangshan stations,respectively,enhancing the measurement accuracy by nearly one meter.The variation of water level in Poyang Lake is highly correlated with the change of rainfall,the reduced precipitation during periods from January to February and October to December corresponds to the declining water level in dry season,while the in-creased rainfall from March to October corresponds to the water level rise in wet season,and the precipitation con-centration period from July to September aligns with the peak of water level in Poyang Lake.

关 键 词：ICESat-2 测高卫星 鄱阳湖 水位监测 降雨量 

分 类 号：P228.5[天文地球—大地测量学与测量工程] P332[天文地球—测绘科学与技术]