Abstract
The presence of deposition in the river decreases the river flow capability's efficiency due to the absence of maintenance along the river. In This research, a new formula to evaluate the sediment capacity in the upstream part of Al-Gharraf River will be developed. The current study reach lies in Wasit province with a distance equal to 58 km. The selected reach of the river was divided into thirteen stations. At each station, the suspended load and the bedload were collected from the river during a sampling period extended from February 2019 till July 2019. The samples were examined in the laboratory with a different set of sample tests. The formula was developed using data of ten stations, and the other three stations were used for validation. The determination coefficient, root mean square error and average relative error values were equal to 0.987,0.97 kg/s and 7%, respectively. Also, the values of the sediment load that resulted from the formula close to the results of the HEC-RAS model from a previous study, and the determination coefficient, root mean square error, and average relative error values were equal to 0.988, 0.88 kg/s, and 7 % respectively for the simulated model.
Highlights
Al-Gharraf River branches from the Tigris River, the main function Al-Gharraf River is delivering water to the cities situated in the center and south of Iraq
The total length of the Al-Gharraf River is 230 km, and the selected length of this study reach is 58 km that lies in Wasit province
The RMSE root mean square error was equal to 0.97 kg/s while the mean relative error was equal to 7%
Summary
Al-Gharraf River branches from the Tigris River, the main function Al-Gharraf River is delivering water to the cities situated in the center and south of Iraq. (Van Rijn, 1984) proposed his bedload and suspended load equations from the average flow depth, the average velocity of sediment particles, and the concentration of sediment material in the bed layer. This equation is for the sand bed with soil diameter ranged between 0.1 ≤ d ≤ 2.0 mm: 2.4 qb = 0.005 (Daham and Abed, 2020) developed a one-dimensional deposit transportation model using HEC-RAS software for the upstream part of Al-Gharraf River to simulate the sediment amount in the river during different discharge values. The purpose of sampling the suspended sediment is to estimate the concentration of accumulated soil particles in the water column over the period. The bed load samples were gathered to obtain the particle distribution curve
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