摘要
湖泊水位是一项常规水文参数,也是众多管理与研究工作的基础。本文以Jason-2测高卫星SGDR(Sensor Geophysical Data Record)数据为基础,选取东南亚最大且颇具国际影响的洞里萨湖为研究区,集成波形重追踪(OCOG算法与Threshold算法)和数据筛选方法对卫星测高数据月精度进行了提升。结果表明在月尺度上:(1)OCOG算法在洞里萨湖有很好的表现,其平均绝对误差(MAE)为0.78m,相对偏差为12.80%;(2)集成基于数据质量等级筛选方法对上述OCOG算法结果进行优化以后,MAE降低为0.73m,RB降低为8.70%;(3)洞里萨湖水位变化与降雨量有很强相关性,且存在2月左右的滞后期。本研究对测高卫星在内陆湖泊进行水位监测,特别在填补资料匮乏地区湖泊水位数据方面具有重要意义。
The lake water level is a conventional hydrological parameter and the basis of many management and research work.Based on Jason-2 height measurement satellite SGDR(Sensor Geophysical Data Record)data,this paper selects Tonle Sap Lake,the largest in Southeast Asia and has considerable international influence,as the research area,integrating waveform retracking(OCOG algorithm and Threshold algorithm)and data screening methods.The monthly accuracy of satellite altimetry data has been improved.The results show that on the monthly scale:(1)The OCOG algorithm has a good performance on Tonle Sap Lake,with an average absolute error(MAE)of 0.78 m and a relative deviation of 12.80%;(2)Integrated screening method based on data quality grade after optimizing the above OCOG algorithm results,MAE is reduced to 0.73 mand RB is reduced to 8.70%;(3)Tonle Sap water level change has a strong correlation with rainfall,and there is a lag period of about February.This study is of great significance for altimetry satellites to monitor the water level of inland lakes,especially in filling the lake water level data in areas where data is scarce.
作者
莫德丽
赵银军
陈国清
梁珊
童凯
梁玉莲
MO De-li;ZHAO Yin-jun;CHEN Guo-qing;LIANG Shan;TONG Kai;LIANG Yu-lian(School of Geography and Planning/Guangxi Key Laboratory of Surface Processes and Intelligent Simulation,Nanning 530001,China;Beibu Gulf Environmental Evolution and Resource Utilization Key Laboratory of Ministry of Education/Guangxi Key Laboratory of Surface Processes and Intelligent Simulation,Nanning 530001,China)
出处
《南宁师范大学学报（自然科学版）》
2020年第4期119-126,共8页
Journal of Nanning Normal University：Natural Science Edition
基金
广西研究生教育创新计划资助项目(YCSW2019180)。
关键词
卫星测高
波形重跟踪
数据筛选
洞里萨湖
精度评价
satellite altimetry
waveform retracking
data screening
Tonle Sap Lake
evoluation of accuracy
