Turbidity disturbances and their relations to dissolved oxygen modelling:A case study of Yellow River Estuary, China
The aim of the study was to gain insights on the hydrological and biogeochemical mechanisms controlling the estuarine ecosystem. Dissolved oxygen is important for aquatic communities, index of water quality and is affected by different environmental factors. A system dynamics model was designed to predict the response of dissolved oxygen to varied environmental factors. Different physical, chemical and biological processes including re-aeration, biochemical oxygen demand, nitrogenous oxygen demand, photosynthesis and respiration of the phytoplankton, which control the fluctuation of dissolved oxygen, were embodied in the present model. The diel dissolved oxygen fluctuated with a single peak-valley type and the highest dissolved oxygen concentrations generally appeared in the late afternoon. Adding turbidity-light attenuation coefficient sub model to it was very significant to explore mechanism of biogeochemical processes in water environment. It has been proved that turbidity affects the dissolved oxygen in estuary negatively. Turbidity pulse on ecosystem function leads to decrease of dissolved oxygen. Water temperature is another critical influencing factor. The higher the temperature is, the worse the impact is. The estuarine ecosystem will be less affected if turbidity pulses occur in lower temperature seasons.
System dynamics model Dissolved oxygen Turbidity Freshwater inflow Temperature
S.Tang T.Sun X.M.Shen
State Key Laboratory of Water Environment Simulation, School of Environment Beijing Normal University Beijing 100875, PRC
国际会议
The 3rd Biennial ISRS Symposium Achieving Healthy and Viable Rivers (ISRS)第3届国际河流大会
北京
英文
281-289
2013-08-05（万方平台首次上网日期，不代表论文的发表时间）