The invention relates to a computer programmed
water environment capacity calculation method based on a Delft3D model, and effectively solves the problems that in the early stage, only the
water environment capacity can be roughly estimated, meanwhile, the time and space precision is poor, and the experience dependence is large. According to the technical scheme, the method comprises the steps that a certain river channel is selected as a research range, and target section
water quality classification is set; setting model boundary conditions including upstream incoming flow and along-the-waybranch boundary conditions; inputting the boundary condition parameters by adopting a Delft3D
model system and outputting the boundary condition parameters to obtain a
pollutant concentration value when the
water quality of the target section meets the requirement; extracting relevant data from the model to calculate the
water environment capacity of the pollutants; Due to the fact that the Delft3D model can utilize specific discrete hydrological
water quality data, a hydrodynamic field and a water quality field with the time being accurate to second and the space being accurate to meter are output through calculation, automatic calculation is achieved by compiling a
computer program, and finally calculation of the water environment capacity of any
water body in any time period can be achieved.