The Simulation And Study On Eutrophication Of City Landscape Lake

This paper sets the landscape lake of city on arid as background, determines the subject and studies lake eutrophication problem, applies the concept of the systematical engineering for determination of technical route for this subject; This paper applies the two-dimensional hydrodynamic model, water quality model, and mix a variety of biological processes which involved in lake eutrophication, into a lake eutrophication coupling model. Taking Ying Ze lake of Tai Yuan city as the carrier, quantify the lake eutrophication problem and reveal the transport and diffusion law of nutrients and eutrophication processes.Aiming at eutrophication problem on the Ying Ze lake, proposing hydrodynamic change plan in order to improve the water quality. The achievement of this research proves a general theoretical significance and practical valueMain study results of this paper are:(l)According to characteristics of the landscape water in the northern city, this paper applies the systematical engineering design concept, composites the two-dimensional hydrodynamic model, water quality model, and mixs a variety of biological processes which involves in lake eutrophication, formed a technical method system of quantifying urban landscape lake eutrophication problem.(2)Based on the two-dimensional hydrodynamic model, this paper sets up the eutrophication coupling model coupled with the former model. The model describes nutrient cycling, phytoplankton and zooplankton growth, growth and distribution of rooted vegetation and macroalgae.(3)Ying Ze Lake for the study, based on the Ying Ze lake structural features, this study determines land and water borders, generalizes the triangle grid system of the numerical simulation and the digital bathymetry, then identifies the basic conditions for eutrophication coupling model, sets up different scenarios. Selecting the total nitrogen, total phosphorus, chlorophyll-a and secchi depth as the factor to simulate and analyze the simulation results, discovers the rule of nutrient transport under different weather and working condition of the lake.(4)Aiming at the poor hydrodynamic conditions and nutrient transport diffusion of the Ying Ze lake, this study puts forward three hydrodynamic conditions change plans, reflect improvement effect of each plan on the hydrodynamic conditions and nutrient transport diffusion.This paper coupling hydrodynamic model, the water quality model and complex biological process set up the eutrophication of the coupling model has not seen from the report. According to systematic analysis the Ying Ze lake hydrodynamic conditions and rule of nutrient transport and diffusion, research results can be used as prevention and control eutrophication theory and the technology reference effect on the Ying Ze lake.