Preprints
https://doi.org/10.5194/esurf-2018-85
https://doi.org/10.5194/esurf-2018-85
18 Dec 2018
 | 18 Dec 2018
Status: this preprint has been withdrawn by the authors.

Modelling confluence dynamics in large sand-bed braided rivers

Haiyan Yang and Zhenhuan Liu

Abstract. Confluences are key morphological nodes in braided rivers where flow converges, creating complex flow patterns and rapid bed deformation. Field survey and laboratory experimental studies have been carried out to investigate the morphodynamic features in individual confluences, but few have investigated the evolution process of confluences in large braided rivers. In the current study a physics-based numerical model was applied to simulate a large lowland braided river dominated by suspended sediment transport, and analyzed the morphologic changes at confluences and their controlling factors. It was found that the confluences in large braided rivers exhibit some dynamic processes and geometric characteristics that are similar to those observed in individual confluences arising from two tributaries. However, they also show some unique characteristics that are result from the influence of the overall braided pattern and especially of neighboring upstream channels.

This preprint has been withdrawn.

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Haiyan Yang and Zhenhuan Liu

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Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Haiyan Yang and Zhenhuan Liu
Haiyan Yang and Zhenhuan Liu

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Short summary
We applied a numerical model to simulate a large lowland braided river with suspended sediment transport, and analyzed the morphologic changes at confluences and their controlling factors. The confluences exhibit some dynamic processes and geometric characteristics similar to those observed in individual confluences arising from two tributaries, but they also show some unique characteristics resulting from the influence of overall braided pattern and especially the neighboring upstream channels.