Dune dynamics and roughness under gradually varying flood waves, comparing flume and field observations, doi: 10.5194/adgeo-39-115-2014

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)
20 Downloads (Pure)

Abstract

Accurate forecasts of bed forms and their roughness during a flood wave are essential for flood management. Bed forms remain dynamic even under steady discharge and are subject to a continuous process of creations and destructions of individual bed forms. Dune evolution during the rising limb of a flood wave is quite well understood and can be modeled. However, dune evolution during the falling limb remains poorly understood. The objective of this paper is to explain the bed form evolution and roughness during the receding limb of fast flood waves. Therefore, bed profiles of two flume experiments were analyzed in detail and individual dune creations and destructions were classified. The results showed that for fast flood waves in subcritical water flow: (1) dune length grows during both rising and falling limb due to amalgamation of bed forms, (2) dune length has a longer adaptation time than dune height, resulting in short, high dunes during the peak discharge, and (3) this hysteresis difference between dune height and length results in a larger roughness than predicted by equilibrium bed form dimension equations, which may result in a larger roughness of the main channel during floods than expected.
Original languageEnglish
Pages (from-to)115-121
JournalAdvances in geosciences
Volume39
DOIs
Publication statusPublished - 2014

Fingerprint

dunes
flood wave
roughness
dune
bedform
beds
limbs
limb
falling
destruction
flume experiment
peak discharge
water flow
hysteresis
forecasting
profiles

Keywords

  • METIS-301314
  • IR-91479

Cite this

@article{0409cf2aeacb4f3e8b067a091760fb87,
title = "Dune dynamics and roughness under gradually varying flood waves, comparing flume and field observations, doi: 10.5194/adgeo-39-115-2014",
abstract = "Accurate forecasts of bed forms and their roughness during a flood wave are essential for flood management. Bed forms remain dynamic even under steady discharge and are subject to a continuous process of creations and destructions of individual bed forms. Dune evolution during the rising limb of a flood wave is quite well understood and can be modeled. However, dune evolution during the falling limb remains poorly understood. The objective of this paper is to explain the bed form evolution and roughness during the receding limb of fast flood waves. Therefore, bed profiles of two flume experiments were analyzed in detail and individual dune creations and destructions were classified. The results showed that for fast flood waves in subcritical water flow: (1) dune length grows during both rising and falling limb due to amalgamation of bed forms, (2) dune length has a longer adaptation time than dune height, resulting in short, high dunes during the peak discharge, and (3) this hysteresis difference between dune height and length results in a larger roughness than predicted by equilibrium bed form dimension equations, which may result in a larger roughness of the main channel during floods than expected.",
keywords = "METIS-301314, IR-91479",
author = "Warmink, {Jord Jurriaan}",
note = "Open access",
year = "2014",
doi = "10.5194/adgeo-39-115-2014",
language = "English",
volume = "39",
pages = "115--121",
journal = "Advances in geosciences",
issn = "1680-7340",
publisher = "European Geosciences Union",

}

TY - JOUR

T1 - Dune dynamics and roughness under gradually varying flood waves, comparing flume and field observations, doi: 10.5194/adgeo-39-115-2014

AU - Warmink, Jord Jurriaan

N1 - Open access

PY - 2014

Y1 - 2014

N2 - Accurate forecasts of bed forms and their roughness during a flood wave are essential for flood management. Bed forms remain dynamic even under steady discharge and are subject to a continuous process of creations and destructions of individual bed forms. Dune evolution during the rising limb of a flood wave is quite well understood and can be modeled. However, dune evolution during the falling limb remains poorly understood. The objective of this paper is to explain the bed form evolution and roughness during the receding limb of fast flood waves. Therefore, bed profiles of two flume experiments were analyzed in detail and individual dune creations and destructions were classified. The results showed that for fast flood waves in subcritical water flow: (1) dune length grows during both rising and falling limb due to amalgamation of bed forms, (2) dune length has a longer adaptation time than dune height, resulting in short, high dunes during the peak discharge, and (3) this hysteresis difference between dune height and length results in a larger roughness than predicted by equilibrium bed form dimension equations, which may result in a larger roughness of the main channel during floods than expected.

AB - Accurate forecasts of bed forms and their roughness during a flood wave are essential for flood management. Bed forms remain dynamic even under steady discharge and are subject to a continuous process of creations and destructions of individual bed forms. Dune evolution during the rising limb of a flood wave is quite well understood and can be modeled. However, dune evolution during the falling limb remains poorly understood. The objective of this paper is to explain the bed form evolution and roughness during the receding limb of fast flood waves. Therefore, bed profiles of two flume experiments were analyzed in detail and individual dune creations and destructions were classified. The results showed that for fast flood waves in subcritical water flow: (1) dune length grows during both rising and falling limb due to amalgamation of bed forms, (2) dune length has a longer adaptation time than dune height, resulting in short, high dunes during the peak discharge, and (3) this hysteresis difference between dune height and length results in a larger roughness than predicted by equilibrium bed form dimension equations, which may result in a larger roughness of the main channel during floods than expected.

KW - METIS-301314

KW - IR-91479

U2 - 10.5194/adgeo-39-115-2014

DO - 10.5194/adgeo-39-115-2014

M3 - Article

VL - 39

SP - 115

EP - 121

JO - Advances in geosciences

JF - Advances in geosciences

SN - 1680-7340

ER -