三峡库首区水位与重力变化相关分析OA

Five terms of gravity differential maps from Nov.2020 to Sep.2022 are offered,some water level and gravity time-varying curves of observation station are plotted and the effects of short time water level changes on gravity observation results in Sep.2024 are analyzed.The results shows that there are good correlation between Three Gorges Reservoir water level changes and regional gravity changes.If the reservoir water level changes greater,the gravity changes contour lines are denser.The rising and falling trend of water level are consistent with the direction of the gravity changes.If the distance between the observation station and the Yangtze River or its branch is less than 300 meter,the water level changes curve is nearly overlapped with the gravity time-varying curve of the observation station.The short time water level changes in two days will affect the self-difference of the survey segment near the Yangtze River or its branches which is observed in two days.If there is one station near the Yangtze river or its branch in a segment,the segment self-difference will exceed 7 μGal,which is far greater than the treble of the self-difference average 1.09 μGal.If the two stations are both near the Yangtze river or its branch or both away from that,the segment self-difference will remain below 5 μGal.