Quantitative Evaluation to the Sediment Load at a Part of Euphrate River in Center of Iraq

• Autorzy: Al Bayaty Majd A. , Al Zubaidy Riyath Z. , Almansory Nisren J.

Identyfikatory

DOI

10.12912/27197050/186867

• Języki publikacji: EN

Abstrakty

EN

Estimates sediment transport in Iraqi Rivers are essential for effective rivers management, particularly when delivery rates is potential threat to environment and ecological systems. Therefore, this research was performed for estimating sediment transport rates in a certain reach from Euphrates River downstream Al Hindiyah Barrage and examine the stat of Entrainment Rate Esi of bed sediments under a unsteady stream flow. In spite of complexity and the difficulty of conducting measurements, the sediment load were measured with satisfactory perfection to achieve acceptable results for monitoring this river reach. The acoustic Doppler current profiler (ADCP) technique were used to measure velocity distribution, cross section profiles, and using (Helley-Smith) sampler to collect bed load samples from twenty cross sections downstream Al Hindiya Barrage. The investigation of suspended sediment concentration in vertical profiles has consisted of using an Entrainment rate relation (Esi), also for evaluating materials concentration near the bed and the upward, the vertical distribution of material particles was examine in the water column. The measurement results are clarified that there are many regions of river covered with high sedimentation, but the suspended load is prevalent mode of transport with average value 97.313%. The observed suspended sediment yield in the river reach was ranged from 386.645 ton/day to 6588.58 ton/day during the drought condition and low level of water discharge and may change with discharge change. While bed load yield ranged between 0.270 ton/day to 5.394 ton/day. The investigation is represented a non-equilibrium condition in sediment transport is prevalent circumstance in channel system. It is tested the relation of Ei against limited grainsizes data and skin shear velocity U*skin then analyzed the regression. The result is shown that near-bed entrainment, evaluated at 15% of the flow depth, decreases with the ratio of settling velocity to skin-friction shear velocity due to its role in determining bed load-layer concentrations. The fit relation for R2 = 0.48 and correlation r = -0.55 are shown that outstanding an association between maximal flow resistance and sediment diffusivities, this is probably because bed-form prompt by turbulence flow which caused nonlinear dependence.

Słowa kluczowe

EN

Euphrates river; entrainment rate; sediment transport; skin-shear velocity; particle Reynolds numer

• Wydawca: Lubelski Oddział Polskiego Towarzystwo Inżynierii Ekologicznej ; Lublin University of Technology ; WNGB Wydawnictwo Naukowe
• Czasopismo: Ecological Engineering & Environmental Technology
• Rocznik: 2024
• Tom: Vol. 25, iss. 6
• Strony: 159--171
• Opis fizyczny: Bibliogr. 30 poz., rys., tab.

Twórcy

autor

Al Bayaty Majd A.

• Department of Civil Engineering, College of Engineering, University of Babylon, Babylon 51001, Iraq

• https://orcid.org/0009-0002-0667-4113

autor

Al Zubaidy Riyath Z.

• Department of Water Resources Engineering, College of Engineering, University of Baghdad 10011, Iraq

• https://orcid.org/0000-0001-7400-3763

autor

Almansory Nisren J.

• Department of Environmental Engineering, College of Engineering, University of Babylon, Babylon 51001, Iraq

• https://orcid.org/0000-0002-8921-7868

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