Suction removal of sediment from between armor blocks. III: Breaking waves

Research output: Contribution to journalJournal article – Annual report year: 2012Researchpeer-review

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Suction removal of sediment from between armor blocks. III: Breaking waves. / Nielsen, Anders Wedel; Sumer, B. Mutlu; Fredsøe, Jørgen.

In: Journal of Hydraulic Engineering (Reston), Vol. 138, No. September, 2012, p. 803-811.

Research output: Contribution to journalJournal article – Annual report year: 2012Researchpeer-review

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@article{2e2095c23ee34c52b5b9109b3ce3ccdd,
title = "Suction removal of sediment from between armor blocks. III: Breaking waves",
abstract = "When a sediment beach covered by stones or an armor layer is exposed to breaking waves, the turbulence generated by the breaking waves can cause mobilization and removal of the sediment underneath the stones. In two earlier studies by the Technical University of Denmark (DTU)-group, the suction removal of sediments from between armor blocks has dealt with the case of steady current and nonbreaking waves. The present study is an extension of these studies and the results will be presented in a similar way. The critical conditions for removal of sediment are determined. It is found that the onset of removal of sediment is governed by three parameters: (1) the sediment mobility (based on the sediment size, wave height, and wave period), (2) the ratio between the sediment size and the stone size, d=D, and (3) surf similarity parameter, ξ ¼ tan{\dh}β{\TH}={\dh}H0=L0 {\TH}0.5. The variation of the critical mobility number for removal of sediment as function ofd=D and ξ is determined for the range 0.001 < d=D ≤ 1.0 and 0.15 < ξ < 6.00. The experiments were made on 1∶2, 1∶14, and 1∶30 slopes. Spilling, plunging, and surging breakers were used in the experiments. Both one and two layers of armor stones and rectangular blocks were studied.",
keywords = "Scour, Beaches, Breakwaters, Breaking waves, Armor units, Sediment",
author = "Nielsen, {Anders Wedel} and Sumer, {B. Mutlu} and J{\o}rgen Freds{\o}e",
year = "2012",
doi = "10.1061/(ASCE)HY.1943-7900.0000592",
language = "English",
volume = "138",
pages = "803--811",
journal = "Journal of Hydraulic Engineering (Reston)",
issn = "0733-9429",
publisher = "American Society of Civil Engineers",
number = "September",

}

RIS

TY - JOUR

T1 - Suction removal of sediment from between armor blocks. III: Breaking waves

AU - Nielsen, Anders Wedel

AU - Sumer, B. Mutlu

AU - Fredsøe, Jørgen

PY - 2012

Y1 - 2012

N2 - When a sediment beach covered by stones or an armor layer is exposed to breaking waves, the turbulence generated by the breaking waves can cause mobilization and removal of the sediment underneath the stones. In two earlier studies by the Technical University of Denmark (DTU)-group, the suction removal of sediments from between armor blocks has dealt with the case of steady current and nonbreaking waves. The present study is an extension of these studies and the results will be presented in a similar way. The critical conditions for removal of sediment are determined. It is found that the onset of removal of sediment is governed by three parameters: (1) the sediment mobility (based on the sediment size, wave height, and wave period), (2) the ratio between the sediment size and the stone size, d=D, and (3) surf similarity parameter, ξ ¼ tanðβÞ=ðH0=L0 Þ0.5. The variation of the critical mobility number for removal of sediment as function ofd=D and ξ is determined for the range 0.001 < d=D ≤ 1.0 and 0.15 < ξ < 6.00. The experiments were made on 1∶2, 1∶14, and 1∶30 slopes. Spilling, plunging, and surging breakers were used in the experiments. Both one and two layers of armor stones and rectangular blocks were studied.

AB - When a sediment beach covered by stones or an armor layer is exposed to breaking waves, the turbulence generated by the breaking waves can cause mobilization and removal of the sediment underneath the stones. In two earlier studies by the Technical University of Denmark (DTU)-group, the suction removal of sediments from between armor blocks has dealt with the case of steady current and nonbreaking waves. The present study is an extension of these studies and the results will be presented in a similar way. The critical conditions for removal of sediment are determined. It is found that the onset of removal of sediment is governed by three parameters: (1) the sediment mobility (based on the sediment size, wave height, and wave period), (2) the ratio between the sediment size and the stone size, d=D, and (3) surf similarity parameter, ξ ¼ tanðβÞ=ðH0=L0 Þ0.5. The variation of the critical mobility number for removal of sediment as function ofd=D and ξ is determined for the range 0.001 < d=D ≤ 1.0 and 0.15 < ξ < 6.00. The experiments were made on 1∶2, 1∶14, and 1∶30 slopes. Spilling, plunging, and surging breakers were used in the experiments. Both one and two layers of armor stones and rectangular blocks were studied.

KW - Scour

KW - Beaches

KW - Breakwaters

KW - Breaking waves

KW - Armor units

KW - Sediment

U2 - 10.1061/(ASCE)HY.1943-7900.0000592

DO - 10.1061/(ASCE)HY.1943-7900.0000592

M3 - Journal article

VL - 138

SP - 803

EP - 811

JO - Journal of Hydraulic Engineering (Reston)

JF - Journal of Hydraulic Engineering (Reston)

SN - 0733-9429

IS - September

ER -