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Flood Hazard Assessment and Mitigation in the Tigris River: An HEC-RAS Approach (Al-Kut dam to Al-Musandaq) | ||
| Civil Engineering and Applied Solutions | ||
| مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 11 خرداد 1405 | ||
| نوع مقاله: Original Article | ||
| شناسه دیجیتال (DOI): 10.22080/ceas.2026.31452.1085 | ||
| نویسندگان | ||
| Mahmoud Mohammad Rezapour Tabari* ؛ Milad Rahshabdiz؛ Mustafa Khudhair Tuama | ||
| Department of Civil Engineering, Faculty of Engineering and Technology, University of Mazandaran, Mazandaran, Iran | ||
| تاریخ دریافت: 22 اسفند 1404، تاریخ بازنگری: 11 فروردین 1405، تاریخ پذیرش: 11 خرداد 1405 | ||
| چکیده | ||
| This study addresses the critical issue of flood hazard management in the Maysan region of Iraq, a city highly susceptible to recurrent and devastating floods, as tragically demonstrated by the 2019 flood event. Focusing on a 169 km reach of the Tigris River downstream of the Al-Kut barrage, including the Al-Musandaq channel, this research investigates the impact of riverine obstacles on flood dynamics. The primary objective is to assess and mitigate flood hazards through advanced hydrological modeling. The study employed the HEC-RAS model, utilizing 169 cross-sections surveyed in 2017 and incorporating digital elevation model (DEM) data. Model calibration, using hydrological and topographical inputs, yielded a Manning’s roughness coefficient of 0.031 for the Tigris River and 0.028 for the Al-Musandawi channel. High accuracy was confirmed by Nash-Sutcliffe Efficiency (NSE) indices of 0.979 and 0.986, respectively, alongside other error metrics (RMSE, MAE). Model simulations revealed that flood waves were primarily delayed, reaching Maysan city with minimal dispersion, leading to inundation. To mitigate these risks, two management approaches were considered: (1) removal of islands and sidebars within the river reach, and (2) construction of a weir. Due to the high cost and limited effectiveness of removing natural obstacles, the focus shifted to structural solutions. Scenarios were developed to design a weir with an optimal crest elevation. The goal was to prevent downstream flow to Maysan city from exceeding 700 m³s during flood seasons, while ensuring a minimum flow of 250 m³s during dry seasons. Simulations of peak flow rates (4000, 2500, 1050, 533, and 250 m³s) established an optimal weir crest elevation of 9.4 meters. This study provides crucial insights into flood mitigation strategies for the Tigris River, offering a data-driven approach to protect vulnerable downstream areas. | ||
| کلیدواژهها | ||
| Flood hazard management؛ HEC-RAS؛ Tigris River؛ Floods coontrol؛ Flood wave routing؛ Hydraulic modeling | ||
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آمار تعداد مشاهده مقاله: 9 |
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