降雨-径流城市地面集水时间计算模型及模拟
发布时间：2018-12-27 12:12
【摘要】：将地面集水过程分为片流、浅水集中流、明渠流和雨水调蓄池内停留4种状态,分别使用曼宁动力学方法、USDA方法、曼宁公式法和均匀流计算法进行计算,提出了适合我国的计算理论和方法,并模拟研究我国6个主要城市的地面集水时间.结果表明:对于光滑地表,集水时间与集水距离成正比;对于粗糙地表,集水时间对集水距离的响应为在片流和浅水集中流临界处出现拐点;相同坡度的光滑地表,不同城市的50 m和150 m集水时间差别较大;《室外排水设计规范》(GB 50014—2006,2014版)关于集水时间和集水距离的规定,在地面平坦且光滑的情况下(坡度S≤0.001)可以应用,当S0.001时,则不安全;《室外排水设计规范》(GB 50014—2006,2014版)关于集水时间和集水距离的规定对于非光滑地表要慎重应用;相同地表曼宁系数时,坡度越大,对设计流量的相对影响越大;相同坡度时,曼宁系数越大,对设计流量的相对影响越大.
[Abstract]:The surface water collecting process was divided into four states: sheet flow, shallow water concentration flow, open channel flow and Rain Water storage tank. The Manning kinetic method, USDA method, Manning formula method and uniform flow calculation method were used to calculate the process. The calculation theory and method suitable for our country are put forward, and the surface water harvesting time of six major cities in China is simulated. The results show that the catchment time is proportional to the catchment distance for the smooth surface, and for the rough surface, the response of the catchment time to the catchment distance is the inflection point at the critical point of the shallow-water concentrated flow. On the smooth surface of the same slope, the water catchment time of 50 m and 150 m in different cities is quite different. The Design Code for Outdoor drainage (GB 50014-200614 / 2014) provides for water harvesting time and distance, which can be applied when the ground is flat and smooth (slope S 鈮，
本文编号：2393042
[Abstract]:The surface water collecting process was divided into four states: sheet flow, shallow water concentration flow, open channel flow and Rain Water storage tank. The Manning kinetic method, USDA method, Manning formula method and uniform flow calculation method were used to calculate the process. The calculation theory and method suitable for our country are put forward, and the surface water harvesting time of six major cities in China is simulated. The results show that the catchment time is proportional to the catchment distance for the smooth surface, and for the rough surface, the response of the catchment time to the catchment distance is the inflection point at the critical point of the shallow-water concentrated flow. On the smooth surface of the same slope, the water catchment time of 50 m and 150 m in different cities is quite different. The Design Code for Outdoor drainage (GB 50014-200614 / 2014) provides for water harvesting time and distance, which can be applied when the ground is flat and smooth (slope S 鈮，
本文编号：2393042
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