%0 Journal Article
%T CHANGES OF LOCAL GRAVITY FIELD BEFORE AND AFTER SECOND IMPOUNDMENT IN THREE GORGES DAM AREA<br>三峡坝区二次蓄水前后的局部重力场变化
%A Sun Shaoan
%A Xiang Aiming
%A Xu Rugang
%A Zhang Xinglin
%A Wei Jin
%A <br>孙少安
%A 项爱民
%A 徐如刚
%A 张新林
%A 韦进
%J 大地测量与地球动力学
%D 2007
%I 
%X By analyzing the characteristics of gravity changes before and after the second impoundment in the Three Gorges dam area, we have found that the variation of gravity approximately accords with the change of water level in the Three Gorges reservoir, but in the head area of reservoir, the difference between the change relations of gravity to water level under the first and the second impoundment is obvious. The gravity changes by the south and north sides in the head area is extremely dissymmetric. The gravity field by the north side changes greatly and attenuates slowly, while that by south side has smaller changes and attenuates quick. In the Xiangxi segment, the variation of gravity is quite regular and presents the characteristics that the gravity changes is stronger by the south side than that by the north side taking basically the Yangtz river as the axis of symmetry. The observation results confirm that the maximum gravity change is still in Xiangxi segment after second impoundment.
%K Three Gorges reservoir
%K second impoundment
%K local gravity field
%K change law
%K variation characteristics<br>三峡水库
%K 二次蓄水
%K 局部重力场
%K 变化规律
%K 变化特征
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=DA72A78627FE64EAA572951EA05D274A&jid=73A1A428591E600EF664B596512A2997&aid=D8051B66BB891A2EF4BCE7E5ABB761DF&yid=A732AF04DDA03BB3&vid=DB817633AA4F79B9&iid=94C357A881DFC066&sid=A4FA325EA800C820&eid=331211A5F5616413&journal_id=1671-5942&journal_name=大地测量与地球动力学&referenced_num=0&reference_num=10