title: Analysis and numerical simulation of natural and human-caused low dissolved oxygen in the Minjiang River Estuary.
abstract: The Minjiang River, a typical tidal channel in Southeast China, plays an important role in the supply of drinking water, flood control and drought relief, farming and navigation, as well as shipping and other functions. Dissolved oxygen (DO), as a basic living condition for aquatic biota, has been deteriorating in the Minjiang River in recent years. In order to understand how the spatial distribution of DO responds to river discharge, nutrient loading and water temperature, a three-dimensional Environmental Fluid Dynamics Code model was used to simulate water age and the distribution of DO in the Minjiang River. The model presented in this paper was used for water resource and water quality simulations under various physical, chemical, and biological scenarios. Sensitivity simulation results indicated that the three factors had a significant impact on the spatial distribution variation of DO in the Minjiang River. Increased river discharge or split ratio of the North Channel resulted in decreased water age and increased DO. Increased nutrient loading and water temperature caused lower DO. In order to protect coastal environments in the Minjiang River, river discharge should be increased and pollutants of local cities should be reduced during the high temperature and drought period.
authors.affiliation: College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China E-mail: ypang@hhu.edu.cn; Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, Hohai University, Nanjing 210098, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Zhang
authors.affiliation: College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China E-mail: ypang@hhu.edu.cn; Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, Hohai University, Nanjing 210098, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Pang
authors.affiliation: Fuzhou Research Academy of Environmental Sciences, 32 Jinjishan Road, Fuzhou 350013, China.
authors.forename: Chengchun
authors.initials: C
authors.lastname: Shi
authors.affiliation: South China Institute of Environmental Sciences, MEP, 7 Yuancun Street, Guangzhou 510655, China.
authors.forename: Yishu
authors.initials: Y
authors.lastname: Wang
authors.affiliation: College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China E-mail: ypang@hhu.edu.cn.
authors.forename: Lei
authors.initials: L
authors.lastname: Xu
authors.affiliation: College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China E-mail: ypang@hhu.edu.cn.
authors.forename: Hongche
authors.initials: H
authors.lastname: Pan
authors.affiliation: College of Environmental Science and Engineering, Fujian Normal University, Fuzhou 350007, China.
authors.forename: Rongrong
authors.initials: R
authors.lastname: Xie
mesh_terms: D002681:China; D004784:Environmental Monitoring; D063366:Estuaries; D008962:Models, Theoretical; D010100:Oxygen / Q000737:chemistry*; D045483:Rivers / Q000737:chemistry*; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*; D060753:Water Quality
chemical_list: D014874:Water Pollutants, Chemical; D014867:Water; D010100:Oxygen