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Field Measurements of Swash on Gravel Beaches

Blewett, J. C. / Holmes, P. / Horn, D. P.

Detailed measurements of individual swash events, the shape of the swash lens, pore-water pressures in the beach and hydraulic gradients were obtained for a gravel beach on the south coast of England. Swash events were classified using the surf/swash scaling parameter and showed that surging breakers occurred in 80% of the runs with the remaining 20% resulting from plunging breakers. Two types of swash behaviour were identified. Swash events at the start of a run showed conditions when there was no interaction between backwash and the uprush of the next swash event; whereas the swash time histories illustrated conditions towards the end of the run, when swash/backwash interaction was prevalent. Downward-acting hydraulic gradients (infiltration) were measured for most of the uprush and backwash cycle. Values were an order of magnitude greater than infiltration events measured on sand beaches.

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Field Measurements of Swash on Gravel Beaches

Blewett, J. C. / Holmes, P. / Horn, D. P.

Detailed measurements of individual swash events, the shape of the swash lens, pore-water pressures in the beach and hydraulic gradients were obtained for a gravel beach on the south coast of England. Swash events were classified using the surf/swash scaling parameter and showed that surging breakers occurred in 80% of the runs with the remaining 20% resulting from plunging breakers. Two types of swash behaviour were identified. Swash events at the start of a run showed conditions when there was no interaction between backwash and the uprush of the next swash event; whereas the swash time histories illustrated conditions towards the end of the run, when swash/backwash interaction was prevalent. Downward-acting hydraulic gradients (infiltration) were measured for most of the uprush and backwash cycle. Values were an order of magnitude greater than infiltration events measured on sand beaches.

Field Measurements of Swash on Gravel Beaches

Blewett, J. C. / Holmes, P. / Horn, D. P.

Detailed measurements of individual swash events, the shape of the swash lens, pore-water pressures in the beach and hydraulic gradients were obtained for a gravel beach on the south coast of England. Swash events were classified using the surf/swash scaling parameter and showed that surging breakers occurred in 80% of the runs with the remaining 20% resulting from plunging breakers. Two types of swash behaviour were identified. Swash events at the start of a run showed conditions when there was no interaction between backwash and the uprush of the next swash event; whereas the swash time histories illustrated conditions towards the end of the run, when swash/backwash interaction was prevalent. Downward-acting hydraulic gradients (infiltration) were measured for most of the uprush and backwash cycle. Values were an order of magnitude greater than infiltration events measured on sand beaches.

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Title:

Field Measurements of Swash on Gravel Beaches

Contributors:

Blewett, J. C. (author) / Holmes, P. (author) / Horn, D. P. (author)

Conference:

Fourth Conference on Coastal Dynamics ; 2001 ; Lund, Sweden

Published in:

Coastal Dynamics '01 ; 828-837

Publication date:

2001-05-18

ISBN:

DOI:

https://doi.org/10.1061/40566(260)85

Type of media:

Conference paper

Type of material:

Electronic Resource

Language:

English

Keywords:

Coastal processes , Beaches , United Kingdom , Wave measurement , Coastal engineering , Gravel , Coastal environment , Coastal management , Wave runup

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