Statistical properties of armored gravel bed surfaces

J. Aberle, V.I. Nikora

Research output: Contribution to journalArticle

118 Citations (Scopus)

Abstract

Roughness of successively developed armor layers in a large laboratory flume is analyzed considering gravel surfaces as two-dimensional random fields of bed elevations. Statistically derived roughness parameters are evaluated from precise digital elevation models (DEMs) of bed surfaces and are discussed with respect to successive development of stable armor layers. The key results relate to evolution of the probability distribution of bed elevations and its moments and structure functions of various orders with respect to armoring discharge. Our results suggest that statistical analysis of bed elevations is a helpful tool for defining roughness parameters, quantifying armoring effects, and identifying particle orientation, flow direction, and surface-forming processes.

Original languageEnglish
Pages (from-to)W11414
Number of pages11
JournalWater Resources Research
Volume42
Issue number11
DOIs
Publication statusPublished - 18 Nov 2006

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roughness
gravel
digital elevation model
statistical analysis
parameter
distribution
effect
particle
laboratory

Keywords

  • order structure functions
  • coarse grained channels
  • flow resistance
  • structured grids
  • roughness
  • scale
  • streams
  • rivers
  • topography
  • profiles

Cite this

Statistical properties of armored gravel bed surfaces. / Aberle, J.; Nikora, V.I.

In: Water Resources Research, Vol. 42, No. 11, 18.11.2006, p. W11414.

Research output: Contribution to journalArticle

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AB - Roughness of successively developed armor layers in a large laboratory flume is analyzed considering gravel surfaces as two-dimensional random fields of bed elevations. Statistically derived roughness parameters are evaluated from precise digital elevation models (DEMs) of bed surfaces and are discussed with respect to successive development of stable armor layers. The key results relate to evolution of the probability distribution of bed elevations and its moments and structure functions of various orders with respect to armoring discharge. Our results suggest that statistical analysis of bed elevations is a helpful tool for defining roughness parameters, quantifying armoring effects, and identifying particle orientation, flow direction, and surface-forming processes.

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KW - structured grids

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KW - scale

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KW - rivers

KW - topography

KW - profiles

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