|Table of Contents|

Drainage Effect of Urban Drainage-pipe Network Under Extreme Rainstorms—Taking Fengxi New City in Xi'an City, China as an Example(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2023年第02期
Page:
427-436
Research Field:
水资源与水文地质
Publishing date:

Info

Title:
Drainage Effect of Urban Drainage-pipe Network Under Extreme Rainstorms—Taking Fengxi New City in Xi'an City, China as an Example
Author(s):
HOU Jing-ming1;  DONG Mei-jun1;  LI Dong-lai1;  MA Yue2;  JI Guo-qiang2;  ZHANG Song3
(1. State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi'an 710048, Shaanxi, China; 2. Research Center for Sponge City, Fengxi New City Development and Construction Group of Shaanxi Xixian New Area Co., Ltd., Xi'an 710061, Shaanxi, China; 3. Sichuan Water Conservancy College, Chengdu 611830, Sichuan, China)
Keywords:
drainage of pipe network;  drainage-pipe network;  coupled model;  inundation;  extreme rainstorm;  overload rate;  drainage rate;  Xi'an
PACS:
TU992
DOI:
10.19814/j.jese.2022.03010
Abstract:
Drainage-pipe network is an important channel for urban rainfall runoff, and its drainage effect related to the safety of urban drainage and flood prevention directly. In order to alleviate urban flood, it is crucial to explore the drainage effect of urban drainage-pipe network under different rainfalls. However, there is no systematic research on how the pipeline network responds to the changes in the drainage effect of different rain-fall intensities. GAST-SWMM coupled model was the tool used in this study. The study area is a certain of Fengxi new city in Xi'an. 1-, 2-, 5-, 10- and 30-year recurrence periods of regular rainfall, and 50-, 100-year recurrence periods of excessive rainstorm were setted, 2 h design rainfall process was used to simulate. The drainage situation of the pipeline network under different rainfall in the study area was simulated, the overload rate of the pipeline and the drainage volume of the pipeline network was calculated, and the drainage effect of the pipeline network was quantitatively evaluated. The results show that the pipeline overload rate is 0.00%-51.22% under conventional rains(recurrence period of rainfall is less than or equal to 30-year), and 64.63% when the recurrence period of rainstorm is 100-year; When the recurrence period of rainfall attains 30-year, the pipeline overload rate is over 50% and the amount of water discharged through the pipe network accounts for 3.55%-22.25% of the total rainfall, and with the increase of the recurrence period, the increase of discharge shows a slowing trend. The most of the drainage-pipe network is overloaded under excessive rainfall even in 30-year recurrence period of rainfall, but it still has drainage capacity under this condition and plays a significant role in the process of urban drainage. This study provides a reference for the planning, design and maintenance of urban stormwater pipe networks.

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Last Update: 2023-05-20