Water quality improvement strategies for a coastal artificial lake

2019 3rd International Workshop on Renewable Energy and Development

能源学;生态环境科学

Zhang, G.Z.^1 ; Huang, S.C.^1 ; Zhou, H.M.^1

Zhejiang Institute of Hydraulics and Estuary, Hangzhou, China

Zhejiang Institute of Marine Planning and Design, Hangzhou, China

Zhejiang Provincial Key Laboratory of Estuary and Coast, Hangzhou, China^1

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/267/5/052023/pdf
DOI  :  10.1088/1755-1315/267/5/052023

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Coastal artificial lakes were encouraged to construct in China for coastal areas remediation. However, it was difficult to keep good water quality. This study investigated water quality improvement strategies for a new coastal artificial lake, located on the coast of Zhejiang Province, China. The expected objectives of water quality in the lake were identified as controlling of algae outbreak accidents under medium eutrophication state, transparency of 1.2 m and ensuring other water quality indicators to maintain or lower than the source water quality. Water exchange was implemented, and the water retention time was designed to be less than 30 days. The sediment could be mostly removed after precipitation in the preliminary precipitation basin. For phosphorus reduction, phosphorus concentration change was predicted by box model. Suppose the active phosphate concentration of inflow water was 0.02 mg/L, when the supplied water volume increased to 18 million m3/a, the active phosphate concentration of the lake could achieve 0.03mg/L. As the water quality was poor in summer, the amount of water supplied was suggested increased. This study established feasible water quality guidelines for sustainable operation, and suggested effective water quality improvement strategies for similar coastal artificial lakes.