Study on algae source pollution and ecological risk control in urban inner lakes
Aiming at the problem of frequently occurred eutrophication in urban inner lakes and the serious harm to their ecological security,we took Hancheng Lake in Xi'an as the research ob-ject,used hydrodynamic and eutrophication models,and scenario simulation analysis of boundary conditions to analyze the causes of water quality deterioration and proposed water quality im-provement plans.The results indicate that the model has a good fit with a coefficient higher than 0.8 after parameter calibration,and can effectively simulate the evolution of the water quality.The scenario simulations reveal that algal growth is influenced by both external environmental factors and nutrient substances,with nutrient substances(particularly inorganic phosphorus)having a greater impact.The most effective measures for water quality improvement include pu-rifying water quality in source water,and increasing the amount of water replenishment,macro-phyte cultivation and the capture of algae by zooplankton.Given the actual situation,a combina-tion of adjusting the amount of water replenishment,adopting eco-purification measures through water diversion channels,and implementing biological manipulation can guarantee the water quality of Hancheng Lake.Moreover,when the water replenishment is insufficient,the optimal hydraulic residence time should be controlled at 35 days.
urban inner lakesalgae growthecological riskMIKE 3 model
国家科技期刊平台
NSTL
万方数据
维普
