CAJ | 학술논문

基于二元水循环理论,着眼于污染物产生、入河过程机理的描述,对流域分布式水质模型WEQ进行了改进.改进模型的农田面源由陆域产生至入河的过程更具有物理机制;借助水土流失方程计算水土流失量,增强了土壤侵蚀面源污染计算结果的可信度;通过水质过程与二元水循环过程的耦合,实现了点、面源污染物入河过程的动态计算;考虑河道内人工取用水量、水库蓄水量变化对污染物时空分布的影响,进一步增强模型的物理机制.以嫩江流域为例,模拟了COD、氨氮的空间分布规律及河道断面负荷变化特征.模拟结果显示,其均方误差与相对误差减小,模拟精度提高.通过产生量核算、水质模拟过程与监测数据对比以及水库调度合理性分析,确保改进模型的模拟误差在合理范围之内,从而能够反映强人类活动干扰下的水质过程,对水环境管理需求具有实际意义.
기우이원수순배이론,착안우오염물산생、입하과정궤리적묘술,대류역분포식수질모형WEQ진행료개진.개진모형적농전면원유륙역산생지입하적과정경구유물리궤제;차조수토류실방정계산수토류실량,증강료토양침식면원오염계산결과적가신도;통과수질과정여이원수순배과정적우합,실현료점、면원오염물입하과정적동태계산;고필하도내인공취용수량、수고축수량변화대오염물시공분포적영향,진일보증강모형적물리궤제.이눈강류역위례,모의료COD、안담적공간분포규률급하도단면부하변화특정.모의결과현시,기균방오차여상대오차감소,모의정도제고.통과산생량핵산、수질모의과정여감측수거대비이급수고조도합이성분석,학보개진모형적모의오차재합리범위지내,종이능구반영강인류활동간우하적수질과정,대수배경관리수구구유실제의의.
Based on the dualistic water cycle theory, a distributed watershed water quality model called WEQ has been improved on the physical mechanism, including the processes of pollutant generation and flowing into river and so on. The improved WEQ is strengthened in its physical mechanism of pollutant from farmland,using MUSLE equation for reference to calculate the amount of soil erosion and coupling wa?ter quality and dualistic water cycle process in dynamic computation. Once the amount of water use from in?dustries and lives in river or water storage in reservoir are changed, the changes of water quality load or concentration are considered. The model has been applied in the Nenjiang River basin to simulate spatial distribution rule of COD and ammonia nitrogen and water quality variation characteristics of river cross-sec?tion. The simulation results show that MSEQ=1.81, Re=37.4% in calibration period and MSEQ=1.45, Re=33.8% in verification period. In order to ensure the simulation error within reasonable limits,the amount of pollutants should be adjusted with the investigation results and the river cross-section pollution load should be verified with the monitoring data.