Abstract
With the continuous increase of urban population, the eutrophication of urban lakes is becoming more and more serious. It is necessary to improve the ecological environment of lakes by water supplement. In this study, TN (total nitrogen) and TP (total phosphorus) of Dongchang Lake before and after water replenishment were sampled and measured, and the hydrodynamic, water quality and sediment MIKE21 models of Dongchang Lake were established. Finally, the variation trend of TN and TP of Dongchang Lake before and after water replenishment of sediment and non-sediment water were simulated, and the following conclusions are drawn: During water replenishment, the TP concentration of each point will rise, and the TP concentration of non-sediment water is higher. After the completion of the water replenishment process, the TP concentration at each point decreases in turn. Under the two water replenishment modes, the difference of TP concentration gradually become narrower, but the TP concentration in non-sediment water is higher. The change trend of TN is similar to that of TP, but after the increase of TN concentration caused by water supply, the concentration of TN remains high in the next few days. This study provides an empirical basis for the development of lake water environment improvement strategies.
Highlights
The development of cities requires the use of various functions of water bodies in the city, among which the value of urban lakes is more reflected in tourism, entertainment, flood storage and drainage, climate regulation and improvement of urban ecological environment
Dongchang Lake, as a water deficient artificial shallow water lake in the north, has no natural river inflow, and its water supply mainly depends on rainfall and Yellow River
Because there are a lot of suspended sediment in the Yellow River water, on the one hand, suspended particles are the carrier of pollutants in water, which can help the transport and transformation of pollutants in water environment; on the other hand, water environment can provide the media that influences the chemical and biological changes of various pollutants, which aggravates the dynamic circulation of pollutants The complexity of the ring eventually destroyed the lake water ecological environment [3,4]
Summary
The development of cities requires the use of various functions of water bodies in the city, among which the value of urban lakes is more reflected in tourism, entertainment, flood storage and drainage, climate regulation and improvement of urban ecological environment. Because there are a lot of suspended sediment in the Yellow River water, on the one hand, suspended particles are the carrier of pollutants in water, which can help the transport and transformation of pollutants in water environment; on the other hand, water environment can provide the media that influences the chemical and biological changes of various pollutants, which aggravates the dynamic circulation of pollutants The complexity of the ring eventually destroyed the lake water ecological environment [3,4]. Aiming to improve the water quality of Dongchang Lake, this paper used Mike to construct twodimensional hydrodynamic, sediment and water quality model, designed different simulation schemes, and explored the influence of sediment water and nonsediment water on pollutants during water replenishment. This research provides empirical basis for the formulation of lake water environment improvement strategy
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