“射阳河口”属小型河口,在江苏海岸冲淤演化的空间格局中具有重要的位置。近年来,人类活动对河口环境的影响日益显著。本文针对在河口修建挡潮闸和围垦这两种人类活动,设计了四种模拟方案:无闸、建闸(关闸)、开关闸(关闸、开闸在涨、落潮期交替)、围垦分别进行模拟计算,并比较各方案造成底床冲淤的特征。 “Sheyang estuary ” is a small estuary, in the Jiangsu coastal scour and siltation evolution spatial pattern has an important position. In recent years, human activities have an increasingly significant impact on the estuary environment. In this paper, four kinds of simulation schemes are designed for the construction of tidal flats and reclamation at the estuary. There are four kinds of simulation schemes: no gate, gate closing, gate opening and closing (gate closing and gate opening alternation), reclamation Simulations were performed separately and the characteristics of the scouring and silting of the beds were compared.