Large scale experiments on gravel and mixed beaches: Experimental procedure, data documentation and initial results

Román-Blanco, Belen López de San; Coates, T. T.; Holmes, Patrick; Chadwick, Andrew; Bradbury, Andrew P.; Baldock, Tom E.; Acuña, Adrián Pedrozo; Lawrence, John M.; Grüne, Joachim

doi:10.1016/j.coastaleng.2005.10.021

Cited by 47 publications

(19 citation statements)

References 3 publications

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“…The porosity values reported here are comparable to those found by López de San Román‐Blanco et al . [], who reported an initial porosity of approximately 0.2 for a 30:70% sand:gravel mixture used in a laboratory wave flume experiment, with values varying between 0.2 and 0.4 as the mix ratio varied (on yearday 185, Advocate Beach had a sand:gravel:cobble mix ratio of 35:58:7%). Few measurements of the hydraulic conductivity of natural MSG beach sediments have been reported in the literature; however, the values reported here fall within the range typical for a sand‐gravel mixture—roughly

10^{- 1}

10^{- 4}

m s − 1 [ Craig , ].…”

Section: Methodsmentioning

confidence: 99%

Vertical structure of pore pressure under surface gravity waves on a steep, megatidal, mixed sand‐gravel‐cobble beach

Guest

Hay

2017

JGR Oceans

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The vertical structure of surface gravity wave‐induced pore pressure is investigated within the intertidal zone of a natural, steeply sloping, megatidal, mixed sand‐gravel‐cobble beach. Results from a coherent vertical array of buried pore pressure sensors are presented in terms of signal phase lag and attenuation as functions of oscillatory forcing frequency and burial depth. Comparison of the observations with the predictions of a theoretical poro‐elastic bed response model indicates that the large observed phase lags and attenuation are attributable to interstitial trapped air. In addition to the dependence on entrapped air volume, the pore pressure phase and attenuation are shown to be sensitive to the hydraulic conductivity of the sediment, to the changing mean water depth during the tidal cycle, and to the redistribution/rearrangement of beach face material by energetic wave action during storm events. The latter result indicates that the effects on pore pressure of sediment column disturbance during instrument burial can persist for days to weeks, depending upon wave forcing conditions. Taken together, these results raise serious questions as to the practicality of using pore pressure measurements to estimate the kinematic properties of surface gravity waves on steep, mixed sand‐gravel beaches.

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10^{- 1}

10^{- 4}

m s − 1 [ Craig , ].…”

Section: Methodsmentioning

confidence: 99%

Vertical structure of pore pressure under surface gravity waves on a steep, megatidal, mixed sand‐gravel‐cobble beach

Guest

Hay

2017

JGR Oceans

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“…In the EU large-scale wave flume experiments, funded through Hydralab (http://www.hydralab.eu/), are regularly conducted in the GWK flume in Hannover, Germany (e.g., Lopez de San Roman-Blanco et al, 2006), the CIEM flume in Barcelona, Spain (e.g., Stratigaki et al, 2011) and the Delta Flume in Vollenhove, the Netherlands (e.g., Williams et al, 2012a).…”

Section: Introductionmentioning

confidence: 99%

Large-scale Barrier Dynamics Experiment II (BARDEX II): Experimental design, instrumentation, test program, and data set

Masselink

Ruju

Conley

et al. 2016

Coastal Engineering

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Despite the increased sophistication of numerical models and field techniques for investigating wave-induced nearshore sediment transport and ensuing beach morphological response, there remains a significant demand for large-scale laboratory experiments to address this research topic. Here, we describe the Barrier Dynamics II experiment (BARDEX II), which involved placing a near prototype-scale sandy barrier in the middle of the Delta Flume in the Netherlands and subjecting the structure to a range of wave, tide and water level conditions. A unique aspect of the experiment was the presence of a lagoon behind the barrier, as often occurs in natural barrier settings, providing a convenient means to experimentally manipulate the groundwater hydrology within the barrier. The overall aim of the BARDEX II was to collect a large-scale data set of energetic waves acting on a sandy beach/barrier system to improve our quantitative understanding and modelling capability of shallow water sediment transport processes in the inner surf, swash and overwash zone. In this paper we introduce BARDEX II and provide a detailed description of the experiment, including the experimental design, instrumentation, test programme and data set, as well as presenting some examples of the morphological and hydrodynamic data set. We also reflect objectively on the strengths and weaknesses of the data set. This paper serves as an introduction to a special issue of Coastal Engineering, solely devoted to the results of BARDEX II.

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“…Indeed, most of the morphological development appears to occur in the swash zone, and results in an upper beachface that is generally steeper compared with the mean beach face. This was demonstrated in a recent large scale experiment with coarse sediments reported by López de San Roman-Blanco et al (2006). This investigation took place at the Large Wave Flume (GWK) in Hanover, Germany, and focussed on the study of the morphological response of two types of coarse-grained beach, one gravel and the other a mixture of gravel and sand.…”

Section: The Role Of Swash On Steep Beachesmentioning

confidence: 94%

A numerical–empirical approach for evaluating morphodynamic processes on gravel and mixed sand–gravel beaches

et al. 2007

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Large scale experiments on gravel and mixed beaches: Experimental procedure, data documentation and initial results

Cited by 47 publications

References 3 publications

Vertical structure of pore pressure under surface gravity waves on a steep, megatidal, mixed sand‐gravel‐cobble beach

Vertical structure of pore pressure under surface gravity waves on a steep, megatidal, mixed sand‐gravel‐cobble beach

Large-scale Barrier Dynamics Experiment II (BARDEX II): Experimental design, instrumentation, test program, and data set

A numerical–empirical approach for evaluating morphodynamic processes on gravel and mixed sand–gravel beaches

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