本文介绍了用计算水力学建立数学模型的方法来解决靠近河口、海湾的城市污水处理厂的处理程度问题。 河口城市的污水排入水体后,由于受径流和潮汐的相互作用及河道冲淤变化等复杂影响,用一般计算方法已无法解决。我国首次应用数学模型为确定杭州市的污水处理程度,提供了比较可靠的依据。 This article describes the use of computational hydraulics to establish a mathematical model to solve the problem of treatment levels in urban sewage treatment plants near estuaries and bays. After the effluent of the estuary city is discharged into the water body, due to the interaction of runoff and tides and the complex effects of river erosion and silting, it cannot be solved by general calculation methods. For the first time, China has applied a mathematical model to determine the degree of wastewater treatment in Hangzhou and provided a relatively reliable basis.