Regional Planning Approach to Protect Surrounding Towns and Villages in the Event of Dam Break: Case Study of AghChay Dam
This article has been corrected.
VIEW CORRECTIONPublication: Natural Hazards Review
Volume 22, Issue 4
Abstract
AghChay Dam is located in northwestern Iran in West Azerbaijan Province and is built on the AghChay River. There are many settlements and features situated downstream of the dam, and in the case of a probable break of AghChay Dam, there would likely be significant casualties and financial loss in the region. Therefore, modeling and mapping dam break–induced flooding and identifying high-hazard zones is of utmost importance in order to manage and mitigate flood hazards and also to devise emergency plans. In this paper, using four indices—flood depth, flood velocity, flood arrival time, and hazard index—flood zoning is carried out and flood hazards are assessed in two overtopping and piping scenarios. The goal is to simulate the flood and prepare flood maps for the desired indices and evaluate flood effects on the area. Accordingly, parts of the different layers of data are extracted using Google Earth and Global Mapper applications at the beginning. Then, the data are entered into the Hydraulic Engineering Center’s River Analysis System (HEC-RAS) application, and after specifying the roughness coefficient, discretization of the domain, and entering the dam information, the simulation is done and zoning maps of the indices are produced. Finally, some maps are edited using the QGIS application. The results indicate that, in modeled scenarios, considerable parts of the area and the agricultural lands are inundated and many features and settlements are placed in seriously hazardous zones. AghChay Dam is destroyed after 25 min in the piping scenario and after 45 min in the overtopping scenario, and 16 and 18 settlements are inundated, respectively. Moreover, out of three important access roads, 10 bridges, and three significant historical monuments, only one of the historical monuments is located in the secure zone. Furthermore, flood arrival time, maximum velocity, depth, and type of hazard zone are extracted for each feature.
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Data Availability Statement
Some or all data, models, or code used during the study were provided by a third party. This data includes all the information contained in the AghChay Storage Dam Design Report, Second Stage Studies, October 2001 that was used for flood modeling. This information has been provided by the Regional Water Company of West Azarbaijan. Access to this information requires a direct request from the relevant organization.
The rest of the data, models and codes generated or used during the study are in the published article.
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Published In
Natural Hazards Review
Volume 22 • Issue 4 • November 2021
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© 2021 American Society of Civil Engineers.
History
Received: Oct 2, 2020
Accepted: Apr 26, 2021
Published online: Aug 5, 2021
Published in print: Nov 1, 2021
Discussion open until: Jan 5, 2022
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