Water Quality Simulation for Southern Typical Rain-Source Rivers Based on MIKE11 Model
Rain-source rivers have small water environment capacity,fragile ecosystems,and are susceptible to strong disturbance by human activities and rainfall,which may lead to environmental problems such as water shortage and serious water pollution in the basin.At present,there is a lack of systematic studies covering the pollutant identification and water quality simulation of rain-source rivers.In this paper,the MIKE11 hydrodynamics(HD)module and convective diffusion(AD)module were established based on a rain-source river(PS River)in southern China,and coupled with the MIKE11 water ecology(ECOLab)module.The main pollutants of the river were identified based on hydrochemical parameters and their temporal and spatial variations were analyzed to clarify the regular pattern.The results showed that the main pollutants affecting the rain-source river were TN,TP and ammonia nitrogen.The concentrations of ammonia nitrogen and TP in the rainy season were higher than those in the dry season,and the concentration of CODCr and TN in the dry season were higher.Besides,the water quality in the downstream section was greatly affected by rainfall runoff.The relative errors of the water quantity and water quality models in the whole basin were 14.5％and 12.5％,respectively,and the Nash coefficients were 0.73 and 0.78,respectively,indicating that the simulation accuracy of the model is good.The relative error and uncertainty of the BOD5 simulation were the highest,and the relative error and uncertainty of the DO simulation were the lowest.This study is helpful to realize the high-precision simulation of rain-source rivers.
万方数据
维普
