| Canghai Wetland Gufeng Wetland Park is an important part of Canghai lake of new Canghai District in Guangxi Wuzhou City, have a major impact to flow and water quality of the Canghai lake.In order to clarify the scientific rationality about the water system’s layout and effects of water quality.To the inlet flow, water morphology and other factors as the basis for experimental design.Running a hydrodynamic models simulate flow field and water quality.Explore how it impacts to the flow field, water quality of the water parkIn the flow field, the main results are as follows:(1) In the maximum flow of wet period,the flow velocity between about0.05m/s-0.15m/s. Water of A and J section flow fastest,generally up to0.15m/s.D, F, I regional Water flow is slow, the rate is about0.05m/s. The overall water area is no stagnant. There is a phenomenon that water flow rate is too fast in localized of the park. Then it not suitable for plant growth.(2) In the minimum flow of dry period,the flow velocity between about0.015m/s-0.045m/s. Water of A and J section flow fastest,generally up to0.045m/s.D, F, K regional Water flow is slow, the rate is about0.015-0.03m/s. The entire park local flow speed is too slow, it may lead to a deterioration of water quality.(3) In the average flow,the flow velocity between about0m/s-0.16m/s.Water of A and J section flow fastest,generally up to0.16m/s.D, F, I regional Water flow is slow, the rate is about0-0.04m/s. The overall water area is no stagnant.Local water is not suitable for plant growth that the flow speed is too fast, Local flow speed is too slow, it may lead to a deterioration of water quality.(4) Changing flow conditions,The overall flow rate maintained at0.025m/s-0.03m/s.Beneficial to algae growth.(5) The case in contrast to the water morphology program,the overall flow rate of the wet period around0m/s-0.06m/s.The water flow is small near the shore area. Some area do not flow. The hydrodynamic conditions of lake is poor. Flow rate of the whole park is between about0m/s-0.04m/s during the dry season, in open water have a small flow rate, Partial area water basic do not flow, In terms of water quality, flow and hydraulic retention time have a large influence on chlorophyll a, TP, TN, DO concentrations, main results are as follows:(1)In the flow of wet period,due to amount of traffic in the entrance,high content of nitrogen and phosphorus in the entrance water.It increase TP and TN accumulation at high-risk areas of blooms,resulting reproduction of algae over fast in partial.Chlorophyll a concentration basic stabilized after17days. We shall to prevent the emergence of the phenomenon blooms.(2)In the flow of dry period,Chlorophyll-a concentrations stable remained at a low level in most parts of the lake after22days, in addition to the TP, TN concentrations have a little high at local area of Northwest and Northeast, other indicators can reach the requirements of III water quality.(3)In the average flow, there will be a local blooms near the beaches of northwest and northeast and central regions after10days.After17days, the development of area will become stabilized, In addition to the TP, TN concentrations have a little high at local area of Northwest,Northeast and central regions, other indicators can reach the requirements of III water quality.(4)In changing the flow boundary condition,the content of chlorophyll-a is relatively stable after10,12and22days, the content of P, N are basically in line with the requirements grade III of water quality, the overall situation is well in the park.Through analysis, concluded as follows:(1)When the park entrance flow is14.5m3/s,it is the most reasonable form of the whole park, when the park entrance the flow is6.72m3/s, it is the most unreasonable form of the whole park.(2) According to comparison of the two forms of water forms, the study found, in the form of the first water,the park hydrodynamic conditions are better; in the second water morphology, both in the wet period or dry season, some areas of the park basically does not flow, hydrodynamic conditions are poor.(3)The size of the flow have a large influence on field distribution in some extent,in the above test, the most beneficial flow of water out of the water is14.5m/s3.The water quality of the Wetland Park can be improved by a7.78m3/s flow rate of the water transfer on the dry season.About0.03m/s flow rate suitable for the growth of algae, and can make the whole park to maintain good water quality.The most detrimental of water flow to water quality is6.72m3/s, the flow rate is too slow, it will lead to the deterioration partial water quality. |
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