Abstract:In order to solve the problems of water level blocking and sediment deposition caused by dam construction,the pneumatic floating dam is adopted in the water system connection and comprehensive treatment project of water environment in Bucheng,Wanzai county.This paper introduces the working principle of pneumatic floating dam,and compares it with the scheme of lying down lifting dam from the aspects of opening and closing mode,project operation,later operation and maintenance,project investment and so on.The results show that the use of buoyancy to open and close the pneumatic floating dam is more in line with the concept of ecological river control and low-carbon river control;The dam body is easy to operate,and the whole body can lie down through exhaust,which basically has no impact on the safety of flood discharge,and avoids the problems of later operation management and protection caused by sediment deposition.It is an optional scheme for low and medium head backwater structures in river ecological regulation.