摘要
随着城市化进程的进一步加快,城市暴雨洪涝灾害频发,居民的生命财产安全受到严重的威胁。本文以粤港澳大湾区典型流域车陂涌为例,结合研究区快速城市化的特点构建了城市暴雨洪涝模型,模拟和预测了城市化过程对流域水文过程的影响。主要结论如下:(1)构建了基于SWMM模型的城市暴雨管理模型并对其进行了验证,结果表明,该模型在研究区适应性较好。(2)研究区1980年代初、2015年及2050年(预测)的城市用地占比分别为15.07%、47.64%及54.29%。在1980—2015年的新增的城市用地里,耕地转化面积占比最大,达到了86.49%。(3)城市化后三个典型河道断面的流量过程线呈单峰状,起伏较大,而1980年代初过程线相对比较平缓;城市化还使得断面洪峰流量大幅增加,峰现时间提前。在0.5年一遇设计降雨条件下,2015年和2050年的流域出口洪峰流量分别比城市化前增加了2.27和2.7倍。本研究可为粤港澳大湾区海绵城市建设、防洪排涝提供科学依据。
As urbanization process speeds up, rainstorm and waterlogging disasters occur more frequently and severely threaten the residents’ safety of life and property. This study develops a stormwater management model(SWMM) combining with rapid urbanization process for assessing the impact of urbanization process on the basin hydrological process, and applies it to the Chebeichong basin, a typical basin in Guangdong-Hong Kong-Macao Greater Bay Area(GBA), to simulate its scenarios in the early 1980 s, 2015 and 2050. Results support the conclusions: 1) Our SWMM is verified against rainfall measurements and shows a good adaptability to the study area. 2) In the study area, the proportions of urban landuse are 15.07%, 47.64% and 54.29% in the three scenarios respectively;and from 1980 to 2015, the urban landuse was expanded by 24.35 km2 and concentrated on an area around the middle lower Chebei River mainstream and its tributary Yangmei River basin. Of the new urban landuse of 1980-2015, cultivated land converted into urban land was its largest proportion of up to 86.49%. 3) At three typical cross sections of the river, flow hydrographs show a single peak shape with large fluctuations after urbanization completed while their variations were relatively mild in 1980. Besides, urbanization can also increase flood peak discharges, advances flood peak times, and raises flood risk. Under the design rainfall of 0.5-year return period, the flood peak discharge at the basin outlet is increased by 2.27 and 2.7 times in the 2015 and 2050 scenarios respectively, and the peak time is nearly an hour earlier. The results are useful in constructing the pipeline networks, flood control, and drainage of GBA.
作者
陈佩琪
王兆礼
曾照洋
陈晓宏
CHEN Peiqi;WANG Zhaoli;ZENG Zhaoyang;CHEN Xiaohong(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510641;State Key Lab of Subtropical Building Science,South China University of Technology,Guangzhou 510641;Center for Water Resources and Environment,Sun Yat-sen University,Guangzhou 510275)
出处
《水力发电学报》
EI
CSCD
北大核心
2020年第9期67-77,共11页
Journal of Hydroelectric Engineering
基金
国家重点研发计划项目(2018YFC1508200)
国家自然科学基金项目(51879107)
广东省水资源节约与保护项目(2017-14)
关键词
城市化
土地利用变化
SWMM模型
水文效应
粤港澳大湾区
urbanization
landuse change
SWMM
hydrological process
Guangdong-Hong Kong-Macao Greater Bay Area
作者简介
陈佩琪(1996—),女,硕士生。E-mail:591318862@qq.com;通信作者:王兆礼(1979—),男,教授。E-mail:wangzhl@scut.edu.cn
