基于卫星测高数据的萨德湿地水位变化研究

On the water level variations of Sudd swamp based on satellite altimetry

以萨德湿地为例,使用ENVISAT和Jason2卫星测高数据利用改进的阈值法进行回波重定,反演萨德湿地水位。结果显示:萨德湿地的恒定水域水位变化规律。通过对比萨德湿地和维多利亚湖的水位变化可以发现,维多利亚湖对萨德湿地南部水域水位有巨大的影响,且影响与人类活动(尤其是欧文瀑布大坝的水能发电)有很大的关系,而位于大坝下游的阿尔伯特湖水位变化和萨德湿地南部水域水位变化有很强的相关性。

Altimetry data from ENVISAT and Jason2 are retracked along with the improved threshold method to retrieve water level of Sudd swamp in this paper.The result clearly reveals the distribution pattern of water bodies.The time series of water level variations are then compared with that of Victoria Lake and Albert Lake,revealing that the Victoria Lake has a great influence on water bodies in south part of Sudd and the influence is mainly due to massive water inflows which connects to human interactions(mainly the Owen Falls Dam s water-generated electricity activity).In the meantime, the comparison with Albert Lake, located in the upstream of Sudd swamp and downstream of Owen Falls Dam, shows that water level variations of water body in the south part of Sudd swamp and that of Albert Lake agree with each other very well.