Experimental study of wave trains generated by vertical bed movements

Reeve, Dominic; Horrillo-Caraballo, Jose; Karunarathna, Harshinie; Wang, Xin Wang

doi:10.1016/j.apor.2024.103971

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Experimental study of wave trains generated by vertical bed movements

Dominic Reeve

, Jose Horrillo-Caraballo, Harshinie Karunarathna

, Xin Wang Wang

Applied Ocean Research, Volume: 147

Swansea University Authors: Dominic Reeve , Jose Horrillo-Caraballo, Harshinie Karunarathna , Xin Wang Wang

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DOI (Published version): 10.1016/j.apor.2024.103971

Abstract

Laboratory experiments were conducted to explore the wave trains generated by vertical bed movements. The investigation consisted of 32 cases, involving four different water depths with unimodal and bimodal bed movements. Water surface displacement was measured using gauges positioned along a 30m lo...

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Published in:	Applied Ocean Research
ISSN:	0141-1187
Published:	Elsevier BV 2024
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa65906
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The investigation consisted of 32 cases, involving four different water depths with unimodal and bimodal bed movements. Water surface displacement was measured using gauges positioned along a 30m long tank. A PIV system was set up to provide detailed measurement of the fluid velocity field in the vicinity of the bed movement. Generally, a unimodal movement generated a solitary-like wave, followed by a trailing sequence of waves. A bimodal bed movement induced a more complex flow field, with both the first and second extrema being significant. New analytical solutions have been derived, enabling the calculation of velocity fields. The nature of the wave generation and propagation were characterised using the disturbance-amplitude scale (α) and disturbance-size scale (δ). The applicability of linear theory was investigated, by validating the linear solutions of the generated waves against the experimental observations. For α ≤ 0.25, the analytical solutions were in good agreement with observations of the free surface shape, flow field and wave elevation history. For α ≥ 0.5, non-linearity became more pronounced, and the analytical solutions were only capable of reasonably estimating the amplitude of the first extremum in the vicinity of the moving bed. The initial crest maintained its amplitude and shape more effectively in crest-leading waves, whereas the leading trough decayed significantly in trough-leading waves. Non-linear phenomena were observed, such as wave breaking, air entrapment and twisted free surface. 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spelling	v2 65906 2024-03-26 Experimental study of wave trains generated by vertical bed movements 3e76fcc2bb3cde4ddee2c8edfd2f0082 0000-0003-1293-4743 Dominic Reeve Dominic Reeve true false 5166f9cd40b7c8628375d3f22d1c473c Jose Horrillo-Caraballo Jose Horrillo-Caraballo true false 0d3d327a240d49b53c78e02b7c00e625 0000-0002-9087-3811 Harshinie Karunarathna Harshinie Karunarathna true false b0ce4aa1ac181e0ccc3388ce3641111b Xin Wang Wang Xin Wang Wang true false 2024-03-26 CIVL Laboratory experiments were conducted to explore the wave trains generated by vertical bed movements. The investigation consisted of 32 cases, involving four different water depths with unimodal and bimodal bed movements. Water surface displacement was measured using gauges positioned along a 30m long tank. A PIV system was set up to provide detailed measurement of the fluid velocity field in the vicinity of the bed movement. Generally, a unimodal movement generated a solitary-like wave, followed by a trailing sequence of waves. A bimodal bed movement induced a more complex flow field, with both the first and second extrema being significant. New analytical solutions have been derived, enabling the calculation of velocity fields. The nature of the wave generation and propagation were characterised using the disturbance-amplitude scale (α) and disturbance-size scale (δ). The applicability of linear theory was investigated, by validating the linear solutions of the generated waves against the experimental observations. For α ≤ 0.25, the analytical solutions were in good agreement with observations of the free surface shape, flow field and wave elevation history. For α ≥ 0.5, non-linearity became more pronounced, and the analytical solutions were only capable of reasonably estimating the amplitude of the first extremum in the vicinity of the moving bed. The initial crest maintained its amplitude and shape more effectively in crest-leading waves, whereas the leading trough decayed significantly in trough-leading waves. Non-linear phenomena were observed, such as wave breaking, air entrapment and twisted free surface. Bimodal bed movements with α ≥ 0.5 generated large, steep crests immediately following the initial trough in trough-leading waves. Journal Article Applied Ocean Research 147 Elsevier BV 0141-1187 Laboratory experiment; Wave generation; Vertical bed movement; Non-linearity 1 6 2024 2024-06-01 10.1016/j.apor.2024.103971 COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University SU Library paid the OA fee (TA Institutional Deal) This work is supported by European Regional Development Fund through the Welsh Government via the SEACAMS2 project. 2024-04-15T17:14:59.7228107 2024-03-26T10:51:24.3959937 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering Dominic Reeve 0000-0003-1293-4743 1 Jose Horrillo-Caraballo 2 Harshinie Karunarathna 0000-0002-9087-3811 3 Xin Wang Wang 4 65906__29986__6af85b5e2f2a4a58ba752a90ca95625a.pdf 65906.VOR.pdf 2024-04-11T11:42:36.2623830 Output 18670250 application/pdf Version of Record true © 2024 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license. true eng http://creativecommons.org/licenses/by/4.0/
title	Experimental study of wave trains generated by vertical bed movements
spellingShingle	Experimental study of wave trains generated by vertical bed movements Dominic Reeve Jose Horrillo-Caraballo Harshinie Karunarathna Xin Wang Wang
title_short	Experimental study of wave trains generated by vertical bed movements
title_full	Experimental study of wave trains generated by vertical bed movements
title_fullStr	Experimental study of wave trains generated by vertical bed movements
title_full_unstemmed	Experimental study of wave trains generated by vertical bed movements
title_sort	Experimental study of wave trains generated by vertical bed movements
author_id_str_mv	3e76fcc2bb3cde4ddee2c8edfd2f0082 5166f9cd40b7c8628375d3f22d1c473c 0d3d327a240d49b53c78e02b7c00e625 b0ce4aa1ac181e0ccc3388ce3641111b
author_id_fullname_str_mv	3e76fcc2bb3cde4ddee2c8edfd2f0082_*_Dominic Reeve 5166f9cd40b7c8628375d3f22d1c473c__Jose Horrillo-Caraballo 0d3d327a240d49b53c78e02b7c00e625__Harshinie Karunarathna b0ce4aa1ac181e0ccc3388ce3641111b_*_Xin Wang Wang
author	Dominic Reeve Jose Horrillo-Caraballo Harshinie Karunarathna Xin Wang Wang
author2	Dominic Reeve Jose Horrillo-Caraballo Harshinie Karunarathna Xin Wang Wang
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description	Laboratory experiments were conducted to explore the wave trains generated by vertical bed movements. The investigation consisted of 32 cases, involving four different water depths with unimodal and bimodal bed movements. Water surface displacement was measured using gauges positioned along a 30m long tank. A PIV system was set up to provide detailed measurement of the fluid velocity field in the vicinity of the bed movement. Generally, a unimodal movement generated a solitary-like wave, followed by a trailing sequence of waves. A bimodal bed movement induced a more complex flow field, with both the first and second extrema being significant. New analytical solutions have been derived, enabling the calculation of velocity fields. The nature of the wave generation and propagation were characterised using the disturbance-amplitude scale (α) and disturbance-size scale (δ). The applicability of linear theory was investigated, by validating the linear solutions of the generated waves against the experimental observations. For α ≤ 0.25, the analytical solutions were in good agreement with observations of the free surface shape, flow field and wave elevation history. For α ≥ 0.5, non-linearity became more pronounced, and the analytical solutions were only capable of reasonably estimating the amplitude of the first extremum in the vicinity of the moving bed. The initial crest maintained its amplitude and shape more effectively in crest-leading waves, whereas the leading trough decayed significantly in trough-leading waves. Non-linear phenomena were observed, such as wave breaking, air entrapment and twisted free surface. Bimodal bed movements with α ≥ 0.5 generated large, steep crests immediately following the initial trough in trough-leading waves.
published_date	2024-06-01T17:14:55Z
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Experimental study of wave trains generated by vertical bed movements

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