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Modelling of Sediment Exchange between Suspended-Load and Bed Material in the Middle and Lower Yellow River, China

by Lianjun Zhao 1, Enhui Jiang 1,*, Dong Chen 2,3 and Wenjiao Zhang 1,2,3,*
1
Key Laboratory of Yellow River Sediment Research, Yellow River Institute of Hydraulic Research, Yellow River Conservancy Commission, Zhengzhou 450003, China
2
Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
*
Authors to whom correspondence should be addressed.
Water 2019, 11(8), 1543; https://doi.org/10.3390/w11081543
Received: 26 June 2019 / Revised: 17 July 2019 / Accepted: 22 July 2019 / Published: 25 July 2019
(This article belongs to the Section Hydrology)
The focus of this paper is on studying novel approaches to estimate sediment exchange between suspended-load and bed material in an unsteady sediment-laden flow with fine-grained sand. The erosion-deposition characteristics of the channel have close relation with the variation of size compositions of both suspended-load and bed material. These aims are addressed by deducing the sediment exchange equations from the mass conservation perspective and establishing a river-sediment mathematical model based on the theory. The model is applied in the middle and lower Yellow River, China, and calibrated and verified under both deposition and erosion conditions using a generalized channel and a large quantity of measured data in the Yellow River basin. The results indicate that the grading curves of suspended-load and bed material calculated by the mathematical model are close to those of the measured data. The temporal and spatial variations in the mean sizes of suspended-load and bed material, flow rate, sediment concentration and erosion or deposition volume estimates during the entire flood process can be accurately predicted. The model performance is considered acceptable for determining the sediment exchange process and the change in channel morphology for unsteady sediment-laden flow. View Full-Text
Keywords: suspended-load; bed material; size gradation; sediment exchange; mathematical model suspended-load; bed material; size gradation; sediment exchange; mathematical model
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Zhao, L.; Jiang, E.; Chen, D.; Zhang, W. Modelling of Sediment Exchange between Suspended-Load and Bed Material in the Middle and Lower Yellow River, China. Water 2019, 11, 1543.

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