基于SWMM模型的城市内涝与面源污染的模拟分析

发布时间：2018-07-25 19:51

【摘要】：随着城市化的快速发展,城市内涝和径流污染现象日益严重。本文以陕西省西安市与咸阳市建成区之间部分区域为研究对象,利用SWMM软件对研究区域建立模型,对传统开发(TD)模式与低影响开发(LID)模式下不同情景的降水事件进行模拟。结果表明:(1)LID措施对于缓解雨水管网节点的积水情况具有较好的效果,重现期较小的降雨事件中,未有积水现象出现;强度大的降雨事件中,径流量及径流污染物均能得到较好调控。(2)在不同情景下,添加LID措施后径流总量控制率提高了3.18%~15.14%,洪峰迟滞时间为5~30min。LID模式与传统开发模式相比较,SS负荷削减率提高了28.16%~38.92%;COD负荷削减率提高了25.24%~36.34%;TP负荷削减率提高了29.78%~40.02%;TN负荷削减率提高了26.57%~37.26%。LID措施能够有效调控城市暴雨径流量,削减径流污染负荷。但随着降雨重现期的增大,LID措施对于暴雨径流和污染负荷调控效果逐渐减弱。
[Abstract]:With the rapid development of urbanization, urban waterlogging and runoff pollution are becoming more and more serious. In this paper, taking some regions between Xi'an City and Xianyang City as the research object, we use SWMM software to establish the model of the study area, and simulate the precipitation events in different scenarios under the traditional development (TD) model and the low impact development (LID) model. The results show that: (1) the LID measures have good effect on relieving the water accumulation of the rainwater pipe network node, no water accumulation occurs in the rainfall events with a small recurrence period, and no water accumulation occurs in the heavy rainfall events. Runoff and runoff pollutants can be well regulated. (2) under different scenarios, After the addition of LID measures, the total runoff control rate increased 3.18% and 15.14%. Compared with the traditional development mode, the Hong Feng hysteresis time increased the SS load reduction rate by 28.16% and 38.92% respectively. The reduction rate of the 5~30min.LID load increased by 25.24% ~ 36.34% TP load reduction rate and the TN load reduction rate increased by 29.7840.02% and 29.7840.02% respectively. The improved 26.57%~37.26%.LID measures can effectively control the urban rainstorm runoff, Reduce runoff pollution load. However, with the increase of rainfall recurrence period, the control effect of Lid on rainstorm runoff and pollution load gradually weakened.
【作者单位】：西安理工大学西北旱区生态水利工程国家重点实验室培育基地;
【基金】：陕西省自然科学基金(2015JZ013) 国家自然科学基金(51279158)
【分类号】：TU992;X52

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