局部土地利用类型变化对城市水文过程的影响研究
Research on the Influence of Local Land Use Type Change on Urban Hydrological Process
李欣怡 1侯精明 1潘占鹏 1景静 1王添 1周庆诗 1董欣刚2
作者信息
- 1. 西安理工大学 西北旱区生态水利国家重点实验室,陕西 西安 710048
- 2. 中建智能技术有限公司,北京 100037
- 折叠
摘要
为探究城市下垫面局部土地利用类型变化对城市水文过程的影响,采用高效高精度城市雨洪模型(GAST)耦合管网模型(SWMM),模拟不同降雨重现期下动态改变土地利用类型(单块无下渗土地C1、多块组合无下渗土地C2、单块裸土地C3、单块草地C4和单块林地C5)对城市地表积水、管网排水的影响.结果表明:改变局部原始土地利用类型(B1)在小降雨重现期下降低了城市积水量,而在大降雨重现期下改变土地下渗面积和区域位置无法进一步减少积水,此时则需考虑非工程措施的极端暴雨应对模式.不同动态规划区域下渗强度导致管网排口流量增幅不同(C2＞C1＞C3＞C4＞C5),隔渗能力越强对管网排口流量增幅影响越大,而管网径流控制率则呈相反趋势.结合对积水量的影响可知,增加下垫面下渗能力并结合排水系统可进一步降低城市内涝风险和管网排水负荷,且管网径流控制率同样可以作为评估动态规划可行性的一个重要指标.
Abstract
In order to explore the impact of local land use change on urban hydrological process,the efficient and high-precision urban rain-water flood model(GAST)coupled pipe network model(SWMM)was used to simulate the impact of dynamic change of land use types(sin-gle non-permeable land C1,multiple combined non-permeable land C2,single bare land C3,single grassland C4 and single forest land C5)on urban surface inundation and pipe network drainage under different rainfall conditions.The results show that changing the local original land use type(B1)reduces the urban inundation amount in the return period of small rainfall,while it cannot further reduce inundation amount in the return period of heavy rainfall,it is necessary to consider the extreme rainstorm response mode of non-engineering measures.The difference of infiltration capacity(C2＞C1＞C3＞C4＞C5)in the dynamic planning area affects the increase of pipe network outlet flow.The greater the infiltration capacity is,the more obvious the impact is on the pipe network outlet flow,while the pipe network runoff control rate shows the opposite trend.Combined with the impact on the waterlogging volume,it can be seen that increasing the infiltration capacity of the underlying surface and combining with the drainage system can further reduce the urban waterlogging risk and the drainage load of the pipe network,and the pipe network runoff control rate can also be an important indicator to evaluate the feasibility of dynamic planning.
关键词
耦合模型/动态规划/地表积涝/管网流量/径流控制率Key words
coupling model/dynamic planning/surface inundation/pipe network flow/runoff control rate引用本文复制引用
基金项目
中德合作交流项目(M-0427)
国家自然科学基金(52079106)
国家自然科学基金(52009104)
出版年
2024
国家科技期刊平台
NSTL
万方数据