Tidal modulation of the hypoxia adjacent to the Yangtze Estuary in summer.
The influence of tide on the distribution of hypoxia adjacent to the Yangtze Estuary was investigated using a three-dimensional hydrodynamic eutrophication model. In the absence of tide, the hypoxic areal extent increased from 5226.75km(2) in the base model run to 19,514.25km(2), and it mainly occurred in the inner shelf region near the mouth of the Yangtze Estuary and in the inner part of Hangzhou Bay. During neap tide, the hypoxic areal extent further increased to cover 20,704.50km(2). Hypoxia first appeared to the southeast of Hangzhou Bay. During the neap to spring tide transition, the hypoxic areal extent decreased to 2430.00km(2) due to reduced stratification (2.65×10(-3)S(-2)) and the direction of the current. The hypoxic areal extent further decreased to 2319.75km(2) during spring tide along with increased current and reduced stratification. Also, hypoxia mainly appeared in the submarine valley.
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China.
Xiaofeng
X
Chen
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China. Electronic address: zyshen@bnu.edu.cn.
Zhenyao
Z
Shen
Chinese Academy for Environmental Planning, #8 Dayangfang, Beiyuan Rd., Chaoyang District, Beijing 100012, PR China.
Yangyang
Y
Li
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China.
Ye
Y
Yang
D063366:Estuaries; D005068:Eutrophication; D057446:Hydrodynamics; D008962:Models, Theoretical; D010100:Oxygen / Q000032:analysis*; D045483:Rivers; D012621:Seasons; D014867:Water / Q000737:chemistry*; D014872:Water Movements; D060753:Water Quality
D014867:Water; D010100:Oxygen
Hypoxia; Residual current; Stratification; Tide; Yangtze Estuary