Abstract

 One and two-dimensional hydraulic models simulations are important to specify the hydraulic characteristics of unsteady flow in Al-Gharraf River in order to define the locations that facing problems and suggesting the necessary treatments. The reach in the present study is 58200m long and lies between Kut and Hai Cities. Both numerical models were simulated using HEC-RAS software, 5.0.4, with flow rates ranging from 100 to 350 m3/s. Multi-scenarios of gates openings of Hai Regulator were applied. While the openings of Al-Gharraf Head Regulator were ranged between 60cm to fully opened. The suitable manning roughness for the unsteady state was 0.025. The obtained results show that the average velocities for the one-dimensional model were ranged between 0.36 and 0.5 m/s, and the average water surface elevations range between 15.14 m and 17.84 m. While these values ranged between 0.25 and 0.44 m/s and 14.125 and 18.82 m respectively for the two-dimensional model. The simulation results of the two-dimensional model were more accurate than their corresponding one-dimensional model, due to more agreement of these values with measured values, which achieved minimum values of the root mean square error and the determination coefficient.
Highlights
The priorities of the needed requirement for consuming water resources in different sectors such as for drinking, irrigation purposes, agriculture needs or for the industry sector, the impact of drought and flood seasons
Contains important hydraulic structures like Gharraf Head Regulator located at the upstream of the reach and the second structure is Hai Regulator, the reach ends near Hai City, Fig
The result of the two-dimensional model predicted acceptable values for both velocity and water surface elevation, and the evaluated Manning coefficient value was 0.027 for the mainstream and 0.041 for its banks. (Pinos and Timbe, 2019) created a two-dimensional model using HEC-RAS software to predict the hydraulic performance of the Santa Barbara River in Ecuador, which considers a mountain river, the model results showed after 20 years, the water will cover 44 % from lands area. (K .B and S.M, 2019) create a one-dimensional unsteady flow model using HEC-RAS software to simulate the hydraulic flow of Purna River located in Navsari city in India
Summary
The priorities of the needed requirement for consuming water resources in different sectors such as for drinking, irrigation purposes, agriculture needs or for the industry sector, the impact of drought and flood seasons. Al-Gharraf River considered the main subdivision of Tigris River plus it is the primary source of water for cities located in the south of Iraq. (Arrar, 2018) constructed a one-dimensional model in HEC-RAS software (both steady and unsteady state) to estimate the manning roughness coefficient in Al- Gharraf River between Kut-Hai cities. (K .B and S.M, 2019) create a one-dimensional unsteady flow model using HEC-RAS software to simulate the hydraulic flow of Purna River located in Navsari city in India. The result of simulating the model showed that the maximum operating flow capacity of the river was 805 m3/s.(Al-thamiry, et al.,2013)create a one-dimension hydrological model to study the Salinity effect on Euphrates River between Ashshinnafiyah and Assamawa Cities using HEC-RAS software. The result of the one-dimensional model showed that the best discharge value which minimizes the danger was 9 m3/s
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