The Roughness Coefficient in Euphrates River Reach between Haditha Dam to Ramadi Barrage
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Abstract
Accurate computation of the roughness coefficient is important in the studies of open channel flow. To measure and identify the hydraulic characteristics of the flow system, the model simulation is necessary to study and get the results of the hydraulic properties to specify Manning coefficient of the Euphrates River. In this study, the reach is extended along the Euphrates River from Haditha Dam to Ramadi Barrage with a distance of 169km. The HEC-RAS model was implemented to simulate the flow within the study reach. The geometry of the river was represented by more than two hundred cross-sections surveyed in 2013 and 2021. The model was calibrated using some observed discharges at the Heet gage station for records of the last five years. The Model was validated using five sets of observed water levels in different cases of manning coefficient in the model. The Root Mean Square Error (RMSE) was used for comparison of the model results. Results of the model showed that the roughness coefficient value for this reach is 0.026 for the river bed and 0.030 for the River bank. These values gave the best coincidence between the simulated and observed values of water levels.
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Abbas, M., S., and Azzubaidi, R., Z., 2020. Current and Modified Flood Discharge Capacity of a Reach of Tigris River between Kut and Amarah Barrages. Journal of Engineering, 26(2), pp. 129–143. doi:10.31026/j.eng.2020.02.10
Shayea, A., G., and Al Thamiry, H., A., 2019. Effect of Tail Regulators on Euphrates River Flood Capacity at Al Nassiriyah City. Journal of Engineering, 26(1), pp. 43–54. doi:10.31026/j.eng.2020.01.05
Farhan, A., M., 2020. Estimation of Surface Runoff in Arid Regions by using Soil and Water Assessment Tool (SWAT) (Case study: A part of the Iraqi Western Desert), MSc. Thesis, Department of water resources Engr., University of Baghdad.
Al. Khuzaie, H., M., A., Awad, A., M., and Abbas, M., F., 2018. A Hydraulic Model for Identification of Surface Friction Coefficient for Euphrates River within Al Muthanna Governorate. Iraq, Al-Muthana Journal of Engineering and Technology, 6 (2), pp.160-168. doi:10.18081/mjet/2018-6/160-168
Hameed, L., K., and Ali, S., T., 2013. Estimating of Manning’s Roughness Coefficient for Hilla River through Calibration Using HEC-RAS Model, Jordan Journal of Civil Engineering, 7(1), pp. 44-53.
Bahramifar, A., Shirkhani, R., and Mohammadi, M., 2013. An ANFIS-based Approach for Predicting the Manning Roughness Coefficient in Alluvial Channels at the Bank-full Stage. International Journal of Engineering, 26(2), pp. 177-186.
Parhi, P., K., 2013. HEC-RAS Model for Mannnig’s Roughness: A Case Study. Open Journal of Modern Hydrology. 3, pp. 97-101. doi:10.4236/ojmh.2013.33013
Abdullah, M., and Al-Ansari, N., 2021. Irrigation projects in Iraq, Journal of Earth Sciences and Geotechnical Engineering, 11 (2), pp. 35-160. doi:10.47260/jesge/1123
Al-Ansari, N., Adamo, N., Sissakian, V., K., Knutsson, S., and Laue, J., 2018. Water Resources of the Euphrates River Catchment, Journal of Earth Sciences and Geotechnical Engineering, 8 (3), pp. 1-20.
Al-Kazwini, M., J., Al-Suhaily, R., H., and Al-hdawi, S., A., 2011, Numerical Modeling of Flood Wave Behavior with Meandering Effects (Euphrates River, Haditha-Hit), Eng. and Tech. Journal, 29(7).
US Army Corps of Engineers, 2021. HEC-RAS, User Manual. Hydrologic Engineering Center, Version 6.1.