城市更新的雨洪过程动态响应模拟研究——以银川市为例  

Simulation study on dynamic response of rain and flood process in urban renewal:A case study of Yinchuan City

作　　者：李欣怡 侯精明 潘占鹏 景静 樊超[2] 孙学良 LI Xinyi;HOU Jingming;PAN Zhanpeng;JING Jing;FAN Chao;SUN Xueiang(State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi’an University of Technology,Xi’an 710048,China;China Academy of Urban Planning&Design,Beijing 100044,China)

机构地区：[1]西安理工大学省部共建西北旱区生态水利国家重点实验室,陕西西安710048 [2]中国城市规划设计研究院,北京100044

出　　处：《水利学报》2023年第11期1347-1358,共12页Journal of Hydraulic Engineering

基　　金：中德合作交流项目(M-0427);国家自然科学基金项目(52079106,52009104)。

摘　　要：为探明城市更新发展中局部片区改造对整体地表径流过程和地下管网排水过程的影响。本文应用耦合水文和水动力学过程数值模型,以银川市西夏区南部和金凤区北部分别作为老城和新城更新片区,进行老城管网雨污分流改造及新城城市边缘区居民用地扩建研究。研究表明:雨污分流对老城地表积涝和管网堵塞均有显著提升作用,不同组合方案局部改造较原始地块可减少地表积涝水量25.06%~49.63%,在峰值时刻和退水3 h后管网充满度<1所占比例较改造前分别提升1.51~2.39倍和1.32~2.66倍(1≤P≤5)。不同面积占比的新城扩建(0.56%、0.30%、0.19%)对城市地表积涝和降雨径流控制率影响随着降雨重现期增加而增大,但其增速在P=20时变缓。因此应充分考虑局部改造对整体城市区域雨洪过程的影响,以避免因城市更新而导致城市洪涝灾害加剧,达到防患未然效果。During the process of urban development and renewal,the transformation of local areas can significantly affect both surface runoff and underground drainage processes.In this paper,the numerical model of coupling hydrological and hydrodynamic processes is applied,and the southern Xixia District and the northern Jinfeng District of Yinchuan City are taken as the renewal areas of the old city and the new city,respectively.The results showed that renovating the rainwater and sewage systems in the old urban area significantly reduced surface inundation and prevented pipe blockages.Different renovation schemes(Area 1,Area 2,and Area 3)resulted in a reduction of surface waterlogging ranging from 25.06% to 49.63% compared to the pre-renovation period.The percentage of time that pipes were filled with water after peak flow and 3 hours of recession was reduced by 1.51 to 2.39 and 1.32 to 2.66 times(1≤P≤5)compared to before the renovation.In the new urban area,the expansion of residential areas(0.56%,0.30%,and 0.19%)had a greater impact on surface inundation and rainfall runoff control as the rainfall recurrence interval increased.However,when P=20,the percentage of increased internal inundation after renovation was higher than before,but the rate of increase slowed down.The longer the rainfall return period,the greater the parabolic constant value.Therefore,the study emphasizes the importance of considering the impact of local changes on the overall rain and flood process in the region,achieve that effect of nip in the bud.

关 键 词：耦合模型 城市更新 旧城改建 雨污分流 新城扩建 雨洪响应 

分 类 号：TV12[水利工程—水文学及水资源]