河川型水库水质预报数学模型

Water Quality Prediction Model for River-Type Reservoirs

根据河川型水库具有狭长形状、有多条河流汇入且有多个库弯水塘的特点,依据圣维南方程组及河流纵向弥散微分方程,并考虑了汇合点和库弯水塘对计算的影响,建立了一维非恒定水质预报数学模型.本模型由水动力模型和水质模型组成.对具有两个汇合点和四个库弯水塘的某水库的断面平均水力要素及水质情况进行了计算,计算值与实测值比较接近.本模型可为河川型水库的水量、水位及水质预报提供参考.

A river-type reservoir is narrow and long in shape and has many reservoir bends and confluences of tributaries. On the basis of Saint-Venant equations and differential equation for longitudinal diffusion and in consideration of the influence of confluences and bends, a one-dimensional unsteady mathematical model for water quality prediction is established in this paper. The model consists of a hydrodynamic model and a water quality model. As an example, average hydraulic characteristics and water quality parameters are calculated for a reservoir with two confluences and four bends. The computed results are in agreement with field observation data. The model can be applied to predict water quantity, water level and water quality of river-type reservoirs.