摘要
城镇建成区普遍面临内涝和非点源污染的问题,且二者均与降雨径流过程关系密切,形成风险叠加。为系统评价城镇建成区的内涝和非点源污染风险,基于建立的水量-水质联合风险评价指标、Copula联合分布函数和SWMM-InfoWorks ICM耦合模型,提出水量-水质联合风险评价方法,以北京某高校为研究区,对2种灰绿情境进行对比分析。结果表明:与基准情境相比,建成区在改造情境下内涝控制弹性、径流控制弹性和水质控制弹性平均值分别从0.55、0.90和0.76提升到0.63、0.95和0.80,风险程度下降但仍存在内涝和水质超标情况;两情境下水质弹性值概率密度分布均存在极值点,造成这一极值点的主要原因是对于悬浮物控制能力的降低;多场次降雨事件中,水量和水质高-低风险边界事件重现期分别由2.21 a和1.60 a提升至4.59 a和1.81 a,风险概率降低;灰绿改造后水量控制能力升高而水质控制能力下降,表明水量-水质联合调控至关重要。
Waterlogging and non-point source pollution are two common problems in urban built-up areas, both of which are closely related to the rainfall runoff process, forming a risk superposition.In order to systematically evaluate the risk of waterlogging and non-point source pollution in urban built-up areas, a joint risk assessment method was proposed which based on the established water quantity-water quality joint risk assessment index, as well as Copula joint distribution function and SWMM-InfoWorks ICM coupling model.A university is used as the research area, in which a comparative analysis of two different gray-green scenarios is carried out.The results show that: compared with the baseline scenario, the average values of waterlogging control elasticity, runoff control elasticity, and water quality control elasticity in the built-up area under the renovation scenario increased from 0.55,0.90,and 0.76 to 0.63,0.95,and 0.80,respectively.However, while the degree of risk decreased, waterlogging and water quality exceeding the standard still existed at the same time.In addition, extreme points exist in the probability density distribution of water quality elasticity values under two scenarios, which are mainly caused by the reduction of SS control ability.In multiple rainfall events been recorded, the high-low risk boundary return period of water quantity and water quality increased from 2.21 a and 1.60 a to 4.59 a and 1.81 a, respectively, which means the risk probability decreased.At last, after the gray-green transformation, the water quantity control ability increased but the water quality control ability decreased, indicating that the joint regulation of water quantity and water quality is very important.
作者
陈磊
周雪辉
余宇
郭晨茜
张潇月
沈珍瑶
CHEN Lei;ZHOU Xuehui;YU Yu;GUO Chenqian;ZHANG Xiaoyue;SHEN Zhenyao(State Key Laboratory of Water Environment Simulation,Beijing Normal University,Beijing 100875;School of Environment,Tsinghua University,Beijing 100084)
出处
《水科学进展》
EI
CAS
CSCD
北大核心
2023年第1期76-87,共12页
Advances in Water Science
基金
国家自然科学基金创新群体项目(52221003)
国家自然科学基金资助项目(42277044)。
关键词
水量
水质
风险评价
非点源污染
城市内涝
弹性指标
water quantity
water quality
risk assessment
non-point source pollution
waterlogging
elasticity index