三峡水库蓄水对地壳形变及大地水准面的影响

On the influence of water storage of Three Gorges Reservoir on the crustal deformation and geoid

利用资源三号(ZY-3)高分辨率遥感影像提取三峡库区水体数据,通过负荷格林函数积分模型法计算出三峡水库蓄水过程中水体对地壳形变及对大地水准面的影响。研究发现:1三峡库区近岸地壳垂直形变与水库水位呈负相关关系,大地水准面与水库水位呈正相关关系;水位上升,长江近岸地面水平向内形变,方向指向江心;2三峡水库蓄水造成的地壳垂直形变最大可达35mm左右,大地水准面形变最大值在8mm左右,而对库区地壳水平形变影响不超过0.5mm;3出现形变最大值的地点是忠县环湾一带,而并非是三峡大坝周边。

This paper uses ZY‐3 high resolution multispectral remote sensing image to extract the data of Three Gorges Reservoir area .The influence of water body on the crustal deformation and the geoid in the Three Gorges Reservoir is calculated by a load Green function integral model .The study finds that ：1）The negative correlation goes between vertical crustal deformation and reservoir water level ,and the positive correlation between the level of the earth and the water level of the reservoir in the Three Gorges Reservoir area .The ground toes inward deformation where the water level rises ,and the direction points at the center of river .2）The vertical deformation of the earth＆#39;s crust caused by the water storage of the Three Gorges Reservoir is about 35 mm ,the maximum deformation of the geoid is about 8 mm ,and the effect of the crustal deformation in the reservoir area is not more than 0.5 mm .3）The location of the maximum deformation stays in the Zhongxian Ring ,not around the surrounding area of the Three Gorges dam .