Flow resistance of emergent rigid and flexible floodplain vegetation

Jochen Aberle*, Juha Järvelä

*Corresponding author for this work

Research output: Contribution to journalArticle

119 Citations (Scopus)

Abstract

This paper summarizes current practices for the estimation of flow resistance caused by floodplain vegetation in emergent flow conditions. The current state-of-the-art for the parameterization of vegetative form drag and associated flow resistance was explored with a view on practical applicability. Specifically, the dissimilar resistance behaviour of simply shaped rigid elements and foliated natural vegetation was emphasized by compiling and reanalysing data published by the authors research teams as well as others. It was shown that describing the key hydraulic properties of plants, geometry, and flexibility, with species-specific parameters is superior to the rigid cylinder analogy commonly used in hydraulic engineering practice. The discussion on the limitations of many existing approaches for the determination of vegetative flow resistance is intended to advance the use of modern practices such as the parameterization of vegetation density with the leaf area index, a parameter that can be derived using remote sensing techniques.

Original languageEnglish
Pages (from-to)33-45
Number of pages13
JournalJOURNAL OF HYDRAULIC RESEARCH
Volume51
Issue number1
DOIs
Publication statusPublished - 1 Feb 2013
MoE publication typeA1 Journal article-refereed

Keywords

  • Environmental fluid mechanics
  • hydraulic resistance (drag coefficients and friction factors)
  • leaf area index
  • river restoration
  • streams and rivers
  • vegetated flows

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