基于Matlab软件自动化求取参数的HEC-RAS模型构建

水质模型是水环境模拟的重要工具，近年来越来越多的应用于水环境预测与管理中，但平原河网水质模拟一直是个难点.本研究采用HEC-RAS模型开展湖州市长兴城区平原河网水动力和水质模拟.模型的水质模块率定采用Matlab软件自动化求取参数，代替常规试错法求参率定，减少了人工干预，提高了模型率定效率.HEC-RAS模型在平原河网地区水动力模拟结果较好，水质模拟结果基本符合要求，证明了HEC-RAS模型在平原河网应用的可行性，但模型的精度通常受水系概化、水文状况、污染源信息等因素影响，对于信息比较充分的短时段水质模拟其精度相对较好.

A HEC-RAS model building with parameters automatically calibrated in Matlab

Water quality models, as water environment simulation tools, have been widely applied in water quality management up to date. However, there is a big challenge existed in simulating water quality of the plain river network by water quality models. The study develop a HEC-RAS model to simulate water dynamics and quality in a plain river network area of Changxing County, Huzhou City. The parameters of this model were calibrated automatically in Matlab. Results show that the calibration efficiency was improved as compared with trial and error method, and the simulation accuracy of model was mainly influenced by water system generalization, hydraulic state, and pollution source information. Results also indicate that our HEC-RAS model would perform much better for short time simulation if sufficient input data are available.