Manijeh Ghahroudi Tali; Shima Shariat; Ali Chavoshian
Abstract
The aim of this research is to simulate the collection of runoff due to irregular rainfall regimes and the total occurrence of annual rainfall in dry areas. Simulation has been done using hydrological models in Islamshahr city with a dry climate. The data includes all the layers related ...
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The aim of this research is to simulate the collection of runoff due to irregular rainfall regimes and the total occurrence of annual rainfall in dry areas. Simulation has been done using hydrological models in Islamshahr city with a dry climate. The data includes all the layers related to surface and subsurface urban infrastructures for collecting runoff, which is prepared from spatial data sources in ArcGIS software. The research method for calculating runoff in Islamshahr is the SCS (CN) model during 2005 and 2011. In this regard, first, the direction and collection of runoff were determined based on elevation data and field observations. Then the amount of runoff produced in each evaluation basin and the geometry of its channels were calculated with the atmospheric runoff simulation Swale model in SWMM software. The combination of the SCS (CN) model in the production of runoff and the Swale model in the SWMM environment has provided a new way to collect runoff at the best point of its concentration so that the maximum runoff produced in basins 3 and 4 and 5 of Islamshahr because the runoff from the upstream basins is also added to it, so it is a suitable outlet for collecting runoff. Also, in terms of reducing runoff, the Swale model reduces the vulnerability potential of Islamshahr in the face of the risks of urban runoff.
