Evolution of water quality risk and dispatching strategy of the tidal sluice at the typical sluice-controlled Estuary in South China
ZHAO Chang-jin, CHEN Gang, YANG Han-jie, WANG Wen-cai, YE Ying-xin, FANG Huai-yang, ZENG Fan-tang, FAN Zhong-ya
Guangdong Key Laboratory of Water and Air Pollution Control, National Key Laboratory of Water Environment Simulation and Pollution Control, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, China
Abstract：Lianjiang Estuary, located at east Guangdong province, is a typical heavily polluted and tidal sluice-controlled estuary in south China. This study utilized a numerical modelling to analyze the seasonal variations of water quality risks and the corresponding rational scheduling strategies of tidal sluice. Based on the Environmental Fluid Dynamics Code (EFDC), a three-dimensional coupled hydrodynamic and water quality model for the Lianjiang-Haimen Bay area was established. Aiming at differentiating the seasonal characteristics of water quality risks and comparing the improvements in varied dispatching schemes of the tide sluice, several scenario cases corresponding to dry and wet seasons were simulated. When the concentrations of pollutants in the dry season continued to exceed the water quality standards, the tide receiving should be scheduled at high tide to dilute the pollutant content. However, in the dry season, due to the high risk of saltwater intrusion, it is not advisable to keep opening sluices for a long time. The major pollution risk in the flood season was induced by the heavy rainfall and the sudden increase of ammonia. After the major polluted water mass was quickly discharged by opening the sluice, the sluice should be arranged to stay open at neap tides period in succession to discharge the remaining water body, preparing for the rapid down-rush of flood water potentially in coming days. By releasing and tracking Lagrangian particles in the numerical model, the total exposure time of the polluted water mass in the flood and dry seasons and the water exchange status of different river sections were calculated. The total exposure time in the flood seasons is in the range of 10~15 days, and in the dry season is about one month. The middle reaches of the river are characterized by the long exposure time. Considering the climate and eutrophication level of the Lianjiang River, the middle reaches are susceptible to algal blooms.
赵长进, 陈钢, 杨汉杰, 王文才, 叶颖欣, 房怀阳, 曾凡棠, 范中亚. 南方典型闸控河口水质风险演变及调度策略[J]. 中国环境科学, 2023, 43(7): 3644-3654.
ZHAO Chang-jin, CHEN Gang, YANG Han-jie, WANG Wen-cai, YE Ying-xin, FANG Huai-yang, ZENG Fan-tang, FAN Zhong-ya. Evolution of water quality risk and dispatching strategy of the tidal sluice at the typical sluice-controlled Estuary in South China. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(7): 3644-3654.
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