Volume 28, Issue 4 (Winter 2025)
jwss 2025, 28(4): 1-22 |
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Ranjbari Hajiabadi M, Abedi Koupai J, Matinzadeh M. Investigating the Performance of SewerGEMS Software in Simulating Urban Runoff for Small Basins (Case Study: Minab City). jwss 2025; 28 (4) :1-22
URL: http://jstnar.iut.ac.ir/article-1-4424-en.html
URL: http://jstnar.iut.ac.ir/article-1-4424-en.html
Department of Water Science and Engineering, College of Agriculture, Isfahan University of Technology, Isfahan, Iran. , koupai@cc.iut.ac.ir
Abstract: (98 Views)
Urban runoff is a serious issue due to urbanization and climate change. Therefore, paying attention to rainfall-runoff simulation models is important to manage and reduce adverse consequences. In this research, the performance of the SewerGEMS software was examined by studying different modes based on the number and area of sub-basins. Two modes, consisting of nine and seventeen sub-basins, were evaluated with varying durations of rainfall of 6 and 12 hours. Additionally, the performance of three methods for calculating concentration time (Kerpich, Brnsby-Williams, Carter) was compared to simulate flood hydrographs in Minab City. The results showed that the total volume of produced runoff in the nine sub-basins was 4% higher than in the seventeen sub-basins. The maximum runoff peak flow in the nine sub-basins was also 20% higher than in the seventeen sub-basins. Furthermore, the Brnsby-Williams method exhibited the least software continuity error among the three calculation methods for concentration time. On the other hand, the Carter method had the highest continuity error. The concentration time calculated by this method in some sub-basins exceeded the 6-hour duration of rain. A t-test was performed to compare the peak discharge data obtained from the Kerpich and Barnesby-Williams methods. The results indicated a significant difference between the data from the two methods at a 95% confidence level (p<0.05). Considering that the Kerpich method is suitable for calculating concentration time in small basins, it was used to compare the nine and seventeen sub-basins. Based on the findings, it was observed that merging the sub-basins and reducing their number from seventeen to nine resulted in an increase in the total volume of produced runoff from approximately 123,839 cubic meters to 128,446 cubic meters, as well as an increase in the maximum peak flow of runoff from about 2.400 m3/s to 2.884 m3/s. This demonstrates an increase in both the total volume and maximum peak discharge of the runoff.
Keywords: Rainfall-runoff simulation models, Rainfall duration, Urban flooding, Time of Concentration, SewerGEMS, Urban sub-basins, Slope of the sub-basin
Type of Study: Research |
Subject:
Ggeneral
Received: 2024/05/20 | Accepted: 2024/06/23 | Published: 2025/01/29
Received: 2024/05/20 | Accepted: 2024/06/23 | Published: 2025/01/29
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