Abstract: By use of single beam bathymetry, side scan sonar and ROV joint inspection technology, the geomembrane face of Nam Ou VI hydropower dam is inspected in detail, the overall situation of geomembrane face and the connection between geomembrane and toe slab are found out, the deformation of geomembrane such as bulge and pit as well as the position and extent of sundries are described, the actual operation of geomembrane is reflected, which provide reliable basis for safety evaluation and dam operation management.

Key words: face slab rock-fill dam, geomembrane, underwater inspection

摘要： 利用单波束测深、侧扫声呐和ROV联合检查技术对南欧江六级水电站大坝土工膜面板进行了详细检查，查明了土工膜面板及土工膜与趾板连接处的整体情况，描述了土工膜鼓包、凹陷等变形及杂物的位置与程度，反映了土工膜的实际运行状态，为大坝运行安全评价和管理提供了可靠的依据。

关键词: 面板堆石坝, 土工膜, 水下检查