Bore-driven swash on beaches

Numerical modeling and large-scale laboratory experiments

Tom O'Donoghue*, Luke J. Hondebrink, Dubravka Pokrajac

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Citations (Scopus)

Abstract

Novel laboratory experiments have been carried out to measure swash hydrodynamics on smooth and rough impermeable beach slopes. The experiments use a swash rig which produces highly repeatable, full-scale, single swash events, enabling detailed measurements of velocities and depths across the swash zone. Example results are presented, showing comparisons between smooth and rough beach hydrodynamics. The effects of roughness are most evident in the maximum run-up, in depths at the top end of the beach and in the backwash velocities. Experimental results have been compared with predictions of depth and depth-averaged velocity from a 1D NLSWE-based numerical model with a simple quadratic stress law for the bed shear stress. Comparison of experimental and model results shows reasonably good agreement for depth and velocities for much of the swash cycle. However, differences in the backwash velocities point to poor bed shear stress modeling. The results imply that good agreement between measured and predicted depths and velocities for swash uprush is not an indication that the bed shear stress is well predicted by the model.

Original languageEnglish
Title of host publicationProceedings of the 30th International Conference on Coastal Engineering 2006, ICCE 2006
EditorsJane McKee Smith
PublisherWorld Scientific
Pages922-933
Number of pages12
ISBN (Print)9789812706362
DOIs
Publication statusPublished - 1 Dec 2007
Event30th International Conference on Coastal Engineering, ICCE 2006 - San Diego, CA, United States
Duration: 3 Sep 20068 Sep 2006

Conference

Conference30th International Conference on Coastal Engineering, ICCE 2006
CountryUnited States
CitySan Diego, CA
Period3/09/068/09/06

Fingerprint

wave runup
Beaches
beach
bottom stress
modeling
shear stress
Shear stress
Experiments
Hydrodynamics
hydrodynamics
roughness
laboratory experiment
Numerical models
Surface roughness
prediction
experiment

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Ocean Engineering
  • Oceanography

Cite this

O'Donoghue, T., Hondebrink, L. J., & Pokrajac, D. (2007). Bore-driven swash on beaches: Numerical modeling and large-scale laboratory experiments. In J. M. Smith (Ed.), Proceedings of the 30th International Conference on Coastal Engineering 2006, ICCE 2006 (pp. 922-933). World Scientific . https://doi.org/10.1142/9789812709554_0079

Bore-driven swash on beaches : Numerical modeling and large-scale laboratory experiments. / O'Donoghue, Tom; Hondebrink, Luke J.; Pokrajac, Dubravka.

Proceedings of the 30th International Conference on Coastal Engineering 2006, ICCE 2006. ed. / Jane McKee Smith. World Scientific , 2007. p. 922-933.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

O'Donoghue, T, Hondebrink, LJ & Pokrajac, D 2007, Bore-driven swash on beaches: Numerical modeling and large-scale laboratory experiments. in JM Smith (ed.), Proceedings of the 30th International Conference on Coastal Engineering 2006, ICCE 2006. World Scientific , pp. 922-933, 30th International Conference on Coastal Engineering, ICCE 2006, San Diego, CA, United States, 3/09/06. https://doi.org/10.1142/9789812709554_0079
O'Donoghue T, Hondebrink LJ, Pokrajac D. Bore-driven swash on beaches: Numerical modeling and large-scale laboratory experiments. In Smith JM, editor, Proceedings of the 30th International Conference on Coastal Engineering 2006, ICCE 2006. World Scientific . 2007. p. 922-933 https://doi.org/10.1142/9789812709554_0079
O'Donoghue, Tom ; Hondebrink, Luke J. ; Pokrajac, Dubravka. / Bore-driven swash on beaches : Numerical modeling and large-scale laboratory experiments. Proceedings of the 30th International Conference on Coastal Engineering 2006, ICCE 2006. editor / Jane McKee Smith. World Scientific , 2007. pp. 922-933
@inproceedings{c92e717cb1174b2399f77b2dd056e681,
title = "Bore-driven swash on beaches: Numerical modeling and large-scale laboratory experiments",
abstract = "Novel laboratory experiments have been carried out to measure swash hydrodynamics on smooth and rough impermeable beach slopes. The experiments use a swash rig which produces highly repeatable, full-scale, single swash events, enabling detailed measurements of velocities and depths across the swash zone. Example results are presented, showing comparisons between smooth and rough beach hydrodynamics. The effects of roughness are most evident in the maximum run-up, in depths at the top end of the beach and in the backwash velocities. Experimental results have been compared with predictions of depth and depth-averaged velocity from a 1D NLSWE-based numerical model with a simple quadratic stress law for the bed shear stress. Comparison of experimental and model results shows reasonably good agreement for depth and velocities for much of the swash cycle. However, differences in the backwash velocities point to poor bed shear stress modeling. The results imply that good agreement between measured and predicted depths and velocities for swash uprush is not an indication that the bed shear stress is well predicted by the model.",
author = "Tom O'Donoghue and Hondebrink, {Luke J.} and Dubravka Pokrajac",
year = "2007",
month = "12",
day = "1",
doi = "10.1142/9789812709554_0079",
language = "English",
isbn = "9789812706362",
pages = "922--933",
editor = "Smith, {Jane McKee }",
booktitle = "Proceedings of the 30th International Conference on Coastal Engineering 2006, ICCE 2006",
publisher = "World Scientific",

}

TY - GEN

T1 - Bore-driven swash on beaches

T2 - Numerical modeling and large-scale laboratory experiments

AU - O'Donoghue, Tom

AU - Hondebrink, Luke J.

AU - Pokrajac, Dubravka

PY - 2007/12/1

Y1 - 2007/12/1

N2 - Novel laboratory experiments have been carried out to measure swash hydrodynamics on smooth and rough impermeable beach slopes. The experiments use a swash rig which produces highly repeatable, full-scale, single swash events, enabling detailed measurements of velocities and depths across the swash zone. Example results are presented, showing comparisons between smooth and rough beach hydrodynamics. The effects of roughness are most evident in the maximum run-up, in depths at the top end of the beach and in the backwash velocities. Experimental results have been compared with predictions of depth and depth-averaged velocity from a 1D NLSWE-based numerical model with a simple quadratic stress law for the bed shear stress. Comparison of experimental and model results shows reasonably good agreement for depth and velocities for much of the swash cycle. However, differences in the backwash velocities point to poor bed shear stress modeling. The results imply that good agreement between measured and predicted depths and velocities for swash uprush is not an indication that the bed shear stress is well predicted by the model.

AB - Novel laboratory experiments have been carried out to measure swash hydrodynamics on smooth and rough impermeable beach slopes. The experiments use a swash rig which produces highly repeatable, full-scale, single swash events, enabling detailed measurements of velocities and depths across the swash zone. Example results are presented, showing comparisons between smooth and rough beach hydrodynamics. The effects of roughness are most evident in the maximum run-up, in depths at the top end of the beach and in the backwash velocities. Experimental results have been compared with predictions of depth and depth-averaged velocity from a 1D NLSWE-based numerical model with a simple quadratic stress law for the bed shear stress. Comparison of experimental and model results shows reasonably good agreement for depth and velocities for much of the swash cycle. However, differences in the backwash velocities point to poor bed shear stress modeling. The results imply that good agreement between measured and predicted depths and velocities for swash uprush is not an indication that the bed shear stress is well predicted by the model.

UR - http://www.scopus.com/inward/record.url?scp=84873033120&partnerID=8YFLogxK

U2 - 10.1142/9789812709554_0079

DO - 10.1142/9789812709554_0079

M3 - Conference contribution

SN - 9789812706362

SP - 922

EP - 933

BT - Proceedings of the 30th International Conference on Coastal Engineering 2006, ICCE 2006

A2 - Smith, Jane McKee

PB - World Scientific

ER -