Abstract
A detailed experimental investigation of the hydrodynamics of large-scale, bore-driven swash on steep permeable, rough beaches is described. The experiments were carried out on two permeable, but fixed rough beaches, made of 1.3mm sand and 8.4mm gravel, respectively. The large-scale discrete swash event was produced by the collapse of a dam break-generated bore on the beach. Simultaneous depths and velocities were measured using laser-induced fluorescence (LIF), and particle image velocimetry (PIV), respectively. Depth time series, instantaneous velocity profiles, depth-averaged velocities, instantaneous turbulent kinetic energy profiles, depth-averaged turbulent kinetic energy, turbulent shear stress profiles and bed shear stresses are presented for several cross-shore measurement locations in the swash. The effect of beach permeability is investigated by comparing new experimental results with previously published data for impermeable beaches with identical surface roughness (Kikkert et al., 2012). The detailed data can be used to test and develop advanced numerical models for bore-driven swash on rough permeable beaches.
Highlights
The swash zone is considered to be the most dynamic region of the beach and considerable research effort has been devoted to studying it
The majority of field studies have investigated the swash zone on sandy beaches focusing on the hydrodynamics (e.g., Baldock and Hughes, 2006; Conley and Griffin, 2004; Hughes, 1992; Raubenheimer, 2002) or the sediment transport (e.g., Blenkinsopp et al, 2011; Horn and Mason, 1994; Hughes et al, 1997; Masselink and Hughes, 1998; Masselink and Russell, 2006; Puleo et al, 2000)
The present paper reports new experiments designed to study the detailed hydrodynamics of large-scale bore-driven swash on steep permeable beaches
Summary
The swash zone is considered to be the most dynamic region of the beach and considerable research effort has been devoted to studying it. The majority of field studies have investigated the swash zone on sandy beaches focusing on the hydrodynamics (e.g., Baldock and Hughes, 2006; Conley and Griffin, 2004; Hughes, 1992; Raubenheimer, 2002) or the sediment transport (e.g., Blenkinsopp et al, 2011; Horn and Mason, 1994; Hughes et al, 1997; Masselink and Hughes, 1998; Masselink and Russell, 2006; Puleo et al, 2000). The field-based investigations have resulted in a reasonable understanding of the main characteristics of the swash zone processes (Butt and Russell, 2000; Elfrink and Baldock, 2002; Masselink and Puleo, 2006). More detailed research is required in order to fully understand the key fundamental processes governing hydrodynamics and sediment transport in the swash zone. One of the key processes is the infiltration of water into the beach
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