三峡工程最大水头113m，溢流坝面最高流速达35m／s，对泄流面平整度要求很高，施工很难作到。为方便施工和溢流面不发生空蚀，研究采用掺气槽。结合国内外已建工程，尤其是乌江渡工程的经验，三峡工程表孔选用组合式掺气槽，其面积取6．8m2，槽深1．2m，挑坎高0.8m，通气孔直径1．3m，槽内负压值667mm水柱，通气孔布置在两侧闸墩上。深孔掺气槽参考龙羊峡水电站的突跌形式，弧门下游秩差2．0m，通气孔直径1．0m，设在两侧边墙上。 The maximum head of the Three Gorges Project is 113m and the maximum flow velocity of spillway dam is 35m / s, which requires high flatness of the discharge surface and is difficult to be constructed. In order to facilitate the construction and overflow surface cavitation does not occur, the study adopted aeration tank. Combined with the experience of built projects at home and abroad, especially the Wujiangdu Project, the combined aeration tank for the Three Gorges Project has a surface area of ​​6.8m2, a groove depth of 1.2m, a pick-up height of 0.8m and a vent diameter of 1. 3m, tank negative pressure value of 667mm water column, vents arranged on both sides of the pier. Deep aeration tank reference Longyangxia hydropower station plunge form, the downstream of the arc gate rank of 2.0m, vent diameter 1.0m, located on both sides of the wall.