河道水质高效高分辨率数值模拟及评估模型研究  

Research on high-efficient and high-resolution numerical simulation and assessment model for river water quality

作　　者：栾广学 侯精明 杨露[1] 李欣怡 吕佳豪 张文晴 孙学良 Guang-xue Luan;Jing-ming Hou;Lu Yang;Xin-yi Li;Jia-hao Lyu;Wen-qing Zhang;Xue-liang Sun(State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China,Xi’an University of Technology,Xi'an 710048,China;China Planning Institute(Beijing)Planning and Design Co.,Beijing 100044,China)

机构地区：[1]西安理工大学省部共建西北旱区生态水利国家重点实验室,西安710048 [2]中规院(北京)规划设计有限公司,北京100044

出　　处：《水动力学研究与进展（A辑）》2022年第3期372-382,共11页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金资助项目(52009104、52079106);中德合作交流项目(M-0427)。

摘　　要：为更好地模拟水污染事件中多组分污染物输移衰减反应过程并对水质指标进行快速评估,该文全面耦合了二维水动力模型与多组分水质模拟及评估模型,根据GB3838-2002地表水环境质量标准,同时引入图形处理器GPU(graphics processing unit)加速技术,构建了一个可对多种水质变量输移及相互反应过程模拟评估的河道水质高效高分辨率数值模拟及评估模型。采用理想地形算例与规则水渠地形算例,验证模型的精度和稳定性,同时根据银川市西大沟COD和NH3-N等水质变量的监测数据对其一级衰减反应系数进行率定,模拟评估城市溢流污染在海绵改造和生态修复等拟建工程措施建设前后对西大沟断面水质的影响。结果表明,该模型可模拟高分辨率地形的多种水质变量输移及相互反应过程,两个验证算例纳什系数分别为1和0.984,模型具有较好的可信度。在旱天无溢流污染情况下,西大沟断面水质均为准Ⅳ类水质;在雨天,城市溢流污染对西大沟影响较大,是导致西大沟水体发生黑臭的一个重要因素,但水环境工程措施对黑臭水体的治理效果明显。模型对城市沟渠水质模拟预测及评估效果较好,以期可为城市水环境工程建设提供相关参考。To better simulate the multi-component pollutant transport and attenuation response process in water pollution events and conduct rapid assessment of water quality indicators,a two-dimensional hydrodynamic model and multi-component water quality simulation and assessment model are coupled in this study,while the GPU acceleration technique is introduced to this model.Thus,an efficient and high-resolution numerical simulation and ev aluation model for river water quality was established,which can simulate and evaluate the transport and interaction processes of various water quality variables.The accuracy and stability of the model are verified by using two case studies,i.e.,the idea l terrain example and regular channel terrain example.Meanwhile,the first order attenuation reaction coefficient is calibrated acco rding to the monitoring data of COD,NH3-N and other water quality variables in Xidagou,Yinchuan city.Then,the impact of urban overflow pollution on water quality of Xidagou section before and after sponge reconstruction and ecological restoration h as been simulated and evaluated.The results show that the model can simulate the transport and mutual reaction process of multip le water quality variables in high-resolution terrain,the Nash coefficients of the two validation cases are 1 and 0.984,respectively,which refers to the model has good credibility.The water quality of Xidagou section is quasi-Class IV in the dry days without overflow pollution;urban overflow pollution has a greater impact on Xidagou in rainy days,which is an important factor lead ing to the black odor of Xidagou water body,but water environment engineering measures are effective in the treatment of black odor water body.The model has a good effect on the simulation prediction and evaluation of urban ditch water quality,which can provide good references for urban water environment engineering construction.

关 键 词：数值模拟 GPU并行计算技术 衰减反应 水质模拟评估 耦合模型 

分 类 号：TV131.2[水利工程—水力学及河流动力学]