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以北碚区城区及其城周山体构成的小流域为例,进行地表径流分析,讨论城市土地利用类型与地表径流的关系,同时探讨了北碚区城市用地的关键点.结果显示:从产流量看,建设用地产流量占总产流量的49.84%,林地占23.57%;从径流河网分布看,研究区内4级以下地表径流多被建设用地覆盖.研究区范围内共有1级地表径流汇水点114个,2级地表径流汇水点33个,3级地表径流汇水点18个,其中1级汇水点多分布于两侧山体中,被林地覆盖,2,3级汇水点多分布于城区朝缙云山方向的边界至山脚200~500 m高程范围内,从保护城区地表水循环的平衡与健康角度出发,此区域应为北碚区城区扩张过程中重点规划区域.
Taking the Beibei District urban area and the small watershed formed by its surrounding area as an example, the authors conducted surface runoff analysis to discuss the relationship between urban land use types and surface runoff, and discussed the key points of urban land use in Beibei District.The results showed that: , 49.84% of the total land use flow and 23.57% of the forest land were used for construction purposes. From the distribution of runoff river networks, the surface runoff below grade 4 in the study area was mostly covered by land for construction purposes. There were 1 surface runoff catchment 114, Level 2 surface runoff catchment points 33, Level 3 surface runoff catchment points 18, of which Level 1 catchments are distributed in both sides of the mountain, covered by woodland, 2,3-level catchments and more It should be distributed within the elevation of 200-500 m from the boundary of Jinyun Mountain toward the foot of the urban area. From the perspective of the balance and health of the surface water circulation in urban areas, this area should be the key planned area during the urban expansion of Beibei District.