Journal of Meteorology and Atmospheric Science

Evaluating the efficiency of the SWMM model in order to investigate the flooding nodes of the drainage network under the influence of climate change (Case study: East of Six District of Tehran Municipality)

10.22034/jmas.2022.360734.1185
Volume 4, Issue 4 - Serial Number 4
Autumn 2021
Pages 326-338
Journal of Meteorology and Atmospheric Science

Document Type : Original Article

Authors

yazdan yarahmadi 1
reza ghazavi 2
hoda ghasemiyeh 3

1 Faculty of Natural Resources and Earth Sciences, Kashan University

2 Professor, Faculty of Natural Resources and Earth Sciences, Kashan University

3 Associate Professor. Faculty Of Natural Resources and Earth Sciences. Kashan University. Iran

Abstract
The aim of the current research is to evaluate the performance of the drainage network and flood control nodes in the base period and under the influence of climate change for the 25 and 50-year return periods in the east of Tehran's sixth district using the SWMM and LARS-WG models. After calibrating the SWMM model based on observed rainfall-runoff events, the calibrating and validation results confirmed the agreement between the observed and simulated data. So that the value of the coefficient(KGE)in the calibration stage for the first, second and third event is 0.70,0.66 and 0.74 respectively and this coefficient in the validation stage for the two measured events is 0.71 and 0.65 respectively. The model simulation for the base period and under the influence of climate change was carried out with a return period of 25 and 50 years and the results showed that the number of flood nodes in the base period(1980-2020)and under the influence of climate change scenario RCP2.6 and RCP8.5(2021 - 2050)for the return period of 25 years, respectively 16,18 and 20 and the number of flood nodes in the base period(1980 - 2020)and under the influence of climate change scenario RCP2.6 and RCP8.5(2051 - 2100) for the return period of 50 years is 20,26 and 28 respectively. Therefore, the modeling results show that the surface runoff collection system of the research area needs to improve and modify the slope of the passages and the dimensions of the channels to transfer the runoff caused by the flood.

Keywords

Urban flooding
SWMM
climate change
LARS - WG
Subjects

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