Modelling morphodynamic development in the presence of immobile sediment

Víctor Chavarrías, Willem Ottevanger, C.J. Sloff, E. Mosselman

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Predicting the formation and break-up of immobile layers is of crucial importance for river management, as these processes greatly affect the morphodynamic evolution of the river bed. Two models are currently available for studying these processes: Struiksma's and Hirano's model. In this paper, we show that both models present limitations. This is done by numerical modelling of a laboratory experiment and two thought experiments. Struiksma's model does not predict break-up and Hirano's model yields unrealistic results when part of the sediment is immobile. We propose two alternatives that overcome these limitations: the ILSE and HANNEKE models. They differ in the interpretation of the top part of the bed interacting with the flow. Moreover, only the HANNEKE model explicitly predicts the formation of coarse layers, at the expenses of a more limited application range.
Original languageEnglish
Number of pages18
JournalGeomorphology
DOIs
Publication statusPublished - 2022

Keywords

  • Mixed-size sediment
  • Immobile sediment
  • Fixed layers
  • Coarse layer
  • Active-layer model

Fingerprint

Dive into the research topics of 'Modelling morphodynamic development in the presence of immobile sediment'. Together they form a unique fingerprint.

Cite this