PIANC Smart Rivers 2022

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due to the occupation of the river and the pollution of water quality, the original ecosystem of the river is also affected, including the reduction of habitat types, the disappearance of habitat, the reduction of biodiversity and the degradation of ecosystem. One of the main contents of the comprehensive river treatment project in Luliang County, Qujing City, Yunnan Province is the ecological restoration project, including creating diversified habitats and improving the self purification capacity of water bodies and the service function of ecosystem. Two landscape gates will be built on XinPan river. A total of two River Center sandbars were built, with a total area of 5948m2; Ecological boulder 1476m3; Ecological wooden pile 933.71m3. Among them, the size, shape, layout density, impact form on sediment and related ecological impact effects of ecological boulders need to be studied by numerical simulation and diagnosis test; Similarly, the arrangement direction and density of ecological wooden piles and their effect on river ecological improvement also need further research and demonstration. In this study, the computational fluid dynamics software FLUENT is used to study the three-dimensional numerical simulation of the layout optimization scheme of ecological boulders and ecological wooden piles in the river comprehensive treatment project in Luliang County, Qujing City, Yunnan Province. It is found that the size, shape, layout density and other geometric elements of river ecological boulders have a significant impact on the evolution of riverbed and flow pattern; The arrangement direction and density of ecological wooden piles affect the change of flow pattern, which leads to the change of ecological response of river water quality. The research results can provide technical support for the optimization scheme of ecological boulders and ecological wooden piles for comprehensive river treatment in Luliang County, Qujing City, Yunnan Province.

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