title: Modelling and Analysis of Hydrodynamics and Water Quality for Rivers in the Northern Cold Region of China.
abstract: In this study, the Mudan River, which is the most typical river in the northern cold region of China was selected as the research object; Environmental Fluid Dynamics Code (EFDC) was adopted to construct a new two-dimensional water quality model for the urban sections of the Mudan River, and concentrations of COD(Cr) and NH₃N during ice-covered and open-water periods were simulated and analyzed. Results indicated that roughness coefficient and comprehensive pollutant decay rate were significantly different in those periods. To be specific, the roughness coefficient in the ice-covered period was larger than that of the open-water period, while the decay rate within the former period was smaller than that in the latter. In addition, according to the analysis of the simulated results, the main reasons for the decay rate reduction during the ice-covered period are temperature drop, upstream inflow decrease and ice layer cover; among them, ice sheet is the major contributor of roughness increase. These aspects were discussed in more detail in this work. The model could be generalized to hydrodynamic water quality process simulation researches on rivers in other cold regions as well.
authors.affiliation: State Key Laboratory of Resources and Environmental Information Systems, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China. gulatang@foxmail.com.|The Engineering Science, Computer Science and Imaging Laboratory, The National Center for Scientific Research, University of Strasbourg, Illkirch 67412, France. gulatang@foxmail.com.|University of Chinese Academy of Sciences, Beijing 100049, China. gulatang@foxmail.com.
authors.forename: Gula
authors.initials: G
authors.lastname: Tang
authors.affiliation: State Key Laboratory of Resources and Environmental Information Systems, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China. zhuyq@igsnrr.ac.cn.|Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China. zhuyq@igsnrr.ac.cn.
authors.forename: Yunqiang
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: Southern Trunk Channel Management Office of South-to-North Water Diversion Project, Beijing 100195, China. wgzh08@163.com.
authors.forename: Guozheng
authors.initials: G
authors.lastname: Wu
authors.affiliation: Heilongjiang Provincial Research Institute of Environmental Science, Harbin 150056, China. lijing020801@126.com.
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.affiliation: The Engineering Science, Computer Science and Imaging Laboratory, The National Center for Scientific Research, University of Strasbourg, Illkirch 67412, France. lizl@unistra.fr.|Key Laboratory of Agri-informatics, Ministry of Agriculture, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China. lizl@unistra.fr.
authors.forename: Zhao-Liang
authors.initials: ZL
authors.lastname: Li
authors.affiliation: State Key Laboratory of Resources and Environmental Information Systems, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China. sunjl@igsnrr.ac.cn.|Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China. sunjl@igsnrr.ac.cn.
authors.forename: Jiulin
authors.initials: J
authors.lastname: Sun
mesh_terms: D000641:Ammonia / Q000032:analysis; D057919:Biological Oxygen Demand Analysis; D002681:China; D003080:Cold Temperature; D004784:Environmental Monitoring; D057446:Hydrodynamics; D008962:Models, Theoretical; D045483:Rivers / Q000737:chemistry; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis; D060753:Water Quality
chemical_list: D014874:Water Pollutants, Chemical; D000641:Ammonia
keywords: cold region; hydrodynamic; model; numerical simulation; water quality