山区河流水环境数值模拟——以四川古蔺河为例
Numerical simulation of water environment in mountainous river:A case of Gulin River,Sichuan Province
王更 1白栋 1钱建利1
作者信息
- 1. 中国地质调查局西安矿产资源调查中心,陕西西安 710100
- 折叠
摘要
山区河流边界地形复杂、水动力条件变化剧烈且水文水质资料缺失,水环境系统不确定性较大,对其开展数值模拟研究具有重要的科学和实践意义.通过建立基于Navier-Stokes的MIKE 21 水动力水质模型,对四川省南部典型山区河流古蔺河进行水环境数值模拟,为山区河流水环境研究提供支撑.结果显示,所建模型表现良好,水动力模型决定系数(R2)平均值为 0.93,平均相对误差(MRE)平均值为 14.25%,水质模型R2 平均值为 0.86,MRE平均值为 19.83%.水动力情景模拟显示,降雨量增加一倍,控制断面处的平均流速增加 7.94%,风速增加一倍,控制断面处的平均流速增加 5.26%.在不同补水情景下,当补水位置位于德耀镇、古蔺镇及太平镇再生水厂上游 5 km,补水量为再生水厂规模的 50%(0.29 m3/s、0.58 m3/s、0.46 m3/s)时,控制断面处COD、NH3-N和TP的平均浓度降幅最大,分别为 24.55%、25.25%和 26.79%.研究结果可为山区河流的水环境研究提供借鉴,对于山区河流的水环境系统治理具有重要意义.
Abstract
The terrain of mountain river boundaries is complex,the hydrodynamic conditions change drastically,and hydrological and water quality data are lacking,leading to significant uncertainty in the water environment system.Conducting numerical simulation research has important scientific and practical significance.In this study,we established a MIKE 21 hydrodynamic and water quality model based on the Navier-Stokes equations to perform numerical simulations of the water environment in the Gulin River,a typical mountain river in the southern part of Sichuan Province.The results show that the established model performs well,with an average coefficient of determination(R²)of 0.93 for the hydrodynamic model and an average mean relative error(MRE)of 14.25%.For the water quality model,the average R²is 0.86 and the average MRE is 19.83%.Hydrodynamic scenario simulations show that doubling the rainfall increases the average flow velocity at the control section by 7.94%,while doubling the wind speed increases the average flow velocity at the control section by 5.26%.Under different water supplementation scenarios,when the supplementation locations are 5 km upstream of the Deyao Town,Gulin Town,and Taiping Town wastewater treatment plants,and the supplementation amount is 50%of the treatment plant capacity(0.29 m³/s,0.58 m³/s,0.46 m³/s),the average concentrations of COD,NH3-N,and TP at the control section decrease the most,by 24.55%,25.25%,and 26.79%,respectively.The research results can provide references for the study of mountain river water environments and are of significant importance for the management of water environment systems in mountain rivers.
关键词
山区河流/水环境/数值模拟/MIKE/21/四川Key words
mountainous river/water environment/numerical simulation/MIKE 21/Sichuan Province引用本文复制引用
基金项目
中国地质调查局项目(DD20242666)
出版年
2024
国家科技期刊平台
NSTL
万方数据