基于SWMM模型的LID方案排澇能力評(píng)估
[Abstract]:"Sponge City" has gradually become a unique concept of urban development in China, and the low-impact development technology (LID) is an effective scientific method. LID technology has a very obvious advantage over the traditional Rain Water storage facilities. However, few papers have carried out comparative study and analysis of the two schemes. Therefore, in this paper, we use part of the easily stagnant land of Shenzhen X University as the research object, using the SWMM model to model the development status, green roof, infiltration pavement, Rain Water Garden three selected LID measures as well as Rain Water storage pool for comprehensive evaluation. The conclusions are as follows: 1, from the effect of total emission reduction, under the rainfall recurrence period of 2 ~ 50 years, Rain Water Garden permeates the green roof, and 2, from the peak discharge reduction effect of discharge outlet, under the rainfall recurrence period of 2 ~ 50 years, Rain Water Garden Green Roof infiltration pavement; 3, from the effect of runoff coefficient reduction, under the condition of rainfall recurrence period of 2 ~ 50 years, Permeation pavement Green Roof Rain Water Garden; 4, under the same rainfall recurrence period P, The volume of the central storage pool is smaller than that of the terminal storage pool. Considering the factors of cost and land use, Rain Water storage pool should be located in the middle of the pipe network. The LID measures of Rain Water Garden, permeable pavement and Green Roof were combined according to different proportion of transformation to form 12 retrofit schemes, which were added to the current SWMM hydraulic model. And under the following three control objective conditions (1, 2 years and 24 hours of rainfall), the designed discharge of Rain Water after development and construction is not greater than the level before development, and under the condition of 24 hours of rainfall once in 2, 10 years, The comprehensive runoff coefficient is not more than 0.60.0.After the LID transformation, under the rainfall condition of 50 years, the depth of accumulated water on the road surface is not more than 15cm. Screen the scheme. Finally, according to the simulation results, four schemes accord with the design goal. They are: green roof (100%) permeable pavement (100%), green roof (100%) permeable pavement (100%), Rain Water garden (10%), green roof (80%) permeable pavement (100%), Rain Water garden (8%), green roof (80%), permeable pavement (100%) and Rain Water garden (6%). The results show that Rain Water reservoir has better hydrological and flood control benefits, but from the point of view of the cost input and the social benefit, the LID reconstruction scheme has obvious advantages. Based on the comprehensive analysis of flood control benefit, cost input and social benefit, by comparing the value of comprehensive energy efficiency, it is found that each LID reconstruction scheme is larger than the traditional Rain Water storage pool, which fully illustrates the advantages of the LID transformation scheme.
【學(xué)位授予單位】:廣州大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TU992
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