Document Type : Research Article
Authors
1
Assistant Professor in Geology, Islamic Azad University Khoy Branch, Khoy, Iran
2
MSc Student in Water Science Engineering, Islamic Azad University Khoy Branch, Khoy, Iran
3
Assistant professor in Water Science Engineering, Islamic Azad University Khoy Branch, Khoy, Iran
Abstract
Zola River contains the most important fresh waters of West Azarbaijan province. The water surface of Urmia lake basin flows in this river. Sarnagh bridge is located on this river on the Sarnagh-Salmas road. Destructive flood event with high return time in river banks especially beside urban and rural residents cause many financial damages and life threats. So, exploring the river’s hydraulic behavior is essential. This study explored the Zola river bed and realm boundary and its floods bond affected by bridges structure. It studied the Zola River in Sarnagh road bridge position using HEC-RAS model. At first, using river 1:2000 scale topographic maps, ArcGIS software with HEC-Geo RAS extension, and HEC-RAS software, river discharge flow with 2, 5, 10, 25, 50, and 100 return time were analyzed for two scenarios. First scenario simulated the normal flow condition of the river and second one simulated the river flow, considering the effects of cross over structure of the bridge. The flow with 25 year return was used to model the design due to regional circumstances and controlled by 100 year return time flow, evaluating river bed extend before and after bridge structures. The results showed that narrow flow in bridge place causes flow reduction, flow reversal, deposition in upstream, as well as increase in the flow, erosion and foaming in the downstream of the bridge, which necessitates a bed stabilization structure.
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