Mô phỏng và đánh giá khả năng tiêu thoát nước mưa khu vực quận 7 – Thành phố Hồ Chí Minh

Abstract

: Ho Chi Minh City (HCMC) is located in the transition zone between the Southeast and the Mekong Delta with terrain that gradually lowers from North to South and from East to West. The area of districts 9, 8, 7 and Binh Chanh, Nha Be, Can Gio districts located in the South-Southwest and Southeast of the city has an average height of around 1m and the highest is 2m, the lowest is 0.5m. Frequently flooded by tides, heavy rain or combined rain and tides. This paper will research and apply the SWMM model to simulate the level of flooding in District 7 and evaluate the drainage capacity of the system corresponding to rain frequency T = 3 years and two cases of water level boundary H = 1.25 m and 1.32 m. The results of model calibration and testing have a correlation coefficient between actual measurements and calculations R 2 = 0.83 and the simulation results show that the level of flooding often occurs at the outlet with fast water concentration time, large amount of water flowing into the manhole, causing water stagnation research area.