Abstract
The change of water and sediment conditions in wandering channels has a great impact on the stability of river regime. The quantitative relationship between them is still unclear. The qualitative influence of water and sediment conditions on the river regime stability was analyzed by a model test. The response relationship between the upward or downward moving distance of the main stream zone and water and sediment conditions was quantitatively studied by using the measured water and sediment data and large-section data over the years. The results showed that when the upstream water and sediment inflow conditions change, the stability of a wandering channel with relatively stable river regime under the control of finite boundary will still change. When the river channel is at 1000 m3/s under the action of long-term small water, or silting thickness is about 0.53 m, the main stream next to the project moves upwards about 1170 m along the way. In the case of a large flood, such as 8000 m3/s, or scouring depth is about 0.39 m, the main stream next to the project moves downwards about 870 m along the way. The study provides a certain scientific basis for river regime stability and river flood control early warning, and provides a certain method reference for quantitative study of river regime evolution of other rivers at home and abroad.
Highlights
Published: 15 December 2021The change of river regime is the result of the interaction between water and sediment conditions and riverbed boundary [1,2]
The combination of the model test and prototype measured data analyIn this study, the combination of the model test and prototype measured data analysis sis was selected, the qualitative understanding of water and sediment conditions on river was selected, the qualitative understanding of water and sediment conditions on river regime evolution was obtained by the model test, and the quantitative impact of water regime evolution was obtained by the model test, and the quantitative impact of water and and sediment conditions on the upward or downward moving distance of main stream sediment conditions on the upward or downward moving distance of main stream zone zone was analyzed by prototype measured data
Theresearch researchshows showsthat thatthe theupward upwardor ordownward downwardmovement movementof ofthe themain mainstream stream zone is closely related to water and sediment conditions
Summary
Published: 15 December 2021The change of river regime is the result of the interaction between water and sediment conditions and riverbed boundary [1,2]. Different conditions of water and sediment make it possible to create different forms of channel and gradients, and the change in riverbed boundary in turn affects the capability of channels to discharge floods and transport sediment, which eventually adjust and change river regimes [3]. Due to the different combinations of water and sediment conditions (the amount and process of water and sediment entering the downstream in a given period of time), riverbed boundary (i.e., plane shape, section shape, longitudinal gradient, riverbed material composition and anti-scourability, beach trough height difference, etc.) and engineering boundary (i.e., project length, layout form, spacing, etc.), which caused the different regime for the same reach at different periods. Taking the Yellow River for example, its unique condition of water and sediment (such as less water and more sediment, temporal and spatial uneven distribution of water and sediment and different sources of water and sediment) is necessary for the formation and maintenance of its wandering reach, and the channel boundary provides space for the evolution and development of its river regime, Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
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