太湖数字流域系统在阳澄湖地区的研究和应用

Research and Application of Digital Valley System of Taihu Basin in Yangcheng Area

基于太湖数字流域系统建立了阳澄湖地区一维河网模型,选取研究范围内38个监测断面的水位水质实测资料对模型进行率定,得到河道参数范围：糙率0.020 ～ 0.025,CODCr降解系数0.1 ～0.3 d-1,NH3-N降解系数0.07～0.29 d-1,TP综合沉降系数0.05～0.10d-1,模型拟合结果较好.应用建立的一维河网模型计算阳澄湖地区污染物削减前后的断面水质浓度,结果显示,太湖数字流域系统可定量地进行阳澄湖地区水环境质量的模拟和预测.

The paper establishes one-dimension water-quantity and water-quality mathematical model for the water network of Yangeheng are- a, based on digital valley system of Taihu Basin. Observed water level and water quality dates of 38 representatives have been employed for the determination and verification of various parameters used in the model. The channel roughness is 0.020 - 0. 025. The degradation factors of CODcr, NH3-N and TP are 0.1 - O. 3, 0.07 - 0.29, 0.05 - O. 10 d -1. The model simulation results present well. Calculation of pollutants concentration of water quality before and after the reduction using river network model shows that the digital valley system of Taihu Basin pro- vides scientific evidence of modeling and prediction of water aulity of Yangcheng area.