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Terrile, E. (author), Reniers, A.J.H.M. (author), Stive, M.J.F. (author), Tromp, M. (author), Verhagen, H.J. (author)Incipient motion of coarse particles under regular shoaling waves is examined. Experiments are performed to investigate the effects of bed fluid acceleration on coarse particle stability. By varying wave height, wave period and water depth, combinations of similar peak orbital velocities and weak to strong intra-wave accelerations were created....journal article 2005
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Van Dongeren, A. (author), Battjes, J.A. (author), Janssen, T. (author), Van Noorloos, J. (author), Steenhauer, K. (author), Steenbergen, G. (author), Reniers, A. (author)The growth rate, shoreline reflection, and dissipation of low?frequency waves are investigated using data obtained from physical experiments in the Delft University of Technology research flume and by parameter variation using the numerical model Delft3D?SurfBeat. The growth rate of the shoaling incoming long wave varies with depth with an...journal article 2007
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Reniers, A.J.H.M. (author), MacMahan, J.H. (author), Thornton, E.B. (author), Stanton, T.P. (author)Numerical computations are used to explain the presence of very low frequency motions (VLFs), with frequencies less than 0.004 Hz, in the rip current velocity signals observed during the Rip-current field Experiment (RIPEX) field experiment. Observations show that the VLF motions are most intense within the surfzone and then quickly taper off in...journal article 2007
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Ruessink, B.G. (author), Kuriyama, Y. (author), Reniers, A.J.H.M. (author), Roelvink, J.A. (author), Walstra, D.J.R. (author)We compare predictions of a coupled, wave-averaged, cross-shore waves-currents-bathymetric evolution model to observations of onshore and offshore nearshore sandbar migration. The observations span a 10- and 44-day period with onshore/offshore bar migration at Duck, North Carolina, and at Hasaki, Kashima Coast, Japan, respectively, a 3.5-month...journal article 2007
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Reniers, A.J.H.M. (author), MacMahan, J.H. (author), Thornton, E.B. (author), Stanton, T.P. (author), Henriquez, M. (author), Brown, J.W. (author), Brown, J.A. (author), Gallagher, E. (author)The retention of floating matter within the surf zone on a rip-channeled beach is examined with a combination of detailed field observations obtained during the Rip Current Experiment and a three-dimensional (3-D) wave and flow model. The acoustic Doppler current profiler–observed hourly vertical cross-shore velocity structure variability over a...journal article 2009
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Brown, J. (author), MacMahan, J. (author), Reniers, A.J.H.M. (author), Thornton, E. (author)Absolute and relative diffusivity are measured on a rip-channeled beach using 30 position-tracking drifters released in clusters (4–12 drifters) deployed on 7 days with different wave forcing and tidal elevations at Sand City, Monterey Bay, California. Diffusivity and dispersion were found to be larger on days with rip current flow patterns and...journal article 2009
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Reniers, A.J.H.M. (author), MacMahan, J.H. (author), Beron-Vera, F.J. (author), Olascoaga, M.J. (author)The trapping and ejection of surfzone floating material is examined by unveiling Lagrangian Coherent Structures (LCSs) hidden in the pulsating rip?current surface velocity field produced by a three?dimensional numerical model resolving wave?group induced Very Low Frequency motions (VLFs). LCSs explain the typically observed patchiness of flotsam...journal article 2010
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MacMahan, J.H. (author), Reniers, A.J.H.M. (author), Thornton, E.B. (author)Observations of velocity fluctuations with periods between about 4 and 30 min, thus longer than infragravity waves and referred to as very low frequency (VLF) surf zone motions, are described and compared with numerical simulations. The VLF motions discussed here exclude instabilities (generated by the wave-driven alongshore current velocity...journal article 2010
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Senechal, N. (author), Abadie, S. (author), Gallagher, E. (author), MacMahan, J. (author), Masselink, G. (author), Michallet, H. (author), Reniers, A. (author), Ruessink, G. (author), Russell, P. (author), Sous, D. (author)A large multi-institutional nearshore field experiment was conducted at Truc Vert, on the Atlantic coast of France in early 2008. Truc Vert’08 was designed to measure beach change on a long, sandy stretch of coast without engineering works with emphasis on large winter waves (offshore significant wave height up to 8 m), a three-dimensional...journal article 2011
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Reniers, A.J.H.M. (author), Gallagher, E.L. (author), MacMahan, J.H. (author), Brown, J.A. (author), Van Rooijen, A.A. (author), Van Thiel de Vries, J.S.M. (author), Van Prooijen, B.C. (author)Novel observations of surface grain-size distributions are used in combination with intra-wave modeling to examine the processes responsible for the sorting of sediment grains on a relatively steep beach (slope?=?1:7.5). The field observations of the mean grain size collected with a digital camera system at consecutive low and high tides for a 2...journal article 2013
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Bosboom, J. (author), Reniers, A.J.H.M. (author)The accuracy of morphological predictions is generally measured by an overall point-wise metric, such as the mean-squared difference between pairs of predicted and observed bed levels. Unfortunately, point-wise accuracy metrics tend to favour featureless predictions over predictions whose features are (slightly) misplaced. From the perspective...journal article 2014
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Reniers, G.L.L.M.E. (author), Brijs, T. (author)The safety-related economic (cost-benefit and cost-effectiveness) tools and models discussed in this paper allow the user to execute an investment analysis, in order to evaluate investments in preventive measures related to occupational accidents. The available software shows that there are a multitude of indirect consequences of occupational...journal article 2014
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Reniers, G.L.L.M.E. (author)The paper argues that organisations who invest intelligently in safety and security, regardless the macroeconomic situation, will have a competitive advantage over their competitors not doing so. Establishing and maintaining a competitive advantage is all about excellence. Excellent results actually require seven domains to be focussed upon: ...journal article 2014
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Khakzad, N. (author), Reniers, G.L.L.M.E. (author)Protection of hazardous establishments such as chemical plants intentional incidents has drawn attention from safety and security experts since 9/11 terrorist attacks in the U.S. Although major steps have been taken since, the recent intentional incidents in two chemical plants in France in June and July 2015 revealed the vulnerbaility and...journal article 2015
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Ortiz-Suslow, D.G. (author), Haus, B.K. (author), Williams, N.J. (author), Laxague, N.J.M. (author), Reniers, A.J.H.M. (author), Graber, H.C. (author)Coastal waters are an aerodynamically unique environment that has been little explored from an air-sea interaction point of view. Consequently, most studies must assume that open ocean-derived parameterizations of the air-sea momentum flux are representative of the nearshore wind forcing. Observations made at the New River Inlet in North...journal article 2015
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Bogucki, D.J. (author), Huguenard, K. (author), Haus, B.K. (author), Özgökmen, T.M. (author), Reniers, A.J.H.M. (author), Laxague, N.J.M. (author)Our understanding of temperature dissipation rate ? within the upper ocean boundary layer, which is critical for climate forecasts, is very limited. Near-surface turbulence also affects dispersion of contaminants and biogeochemical tracers. Using high-resolution optical turbulence measurements, scaling laws for ? are investigated under forcing...journal article 2015
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Brouwer, R.L. (author), De Schipper, M.A. (author), Rynne, P.F. (author), Graham, F.J. (author), Reniers, A.J.H.M. (author), Macmahan, J.H. (author)This study investigates the potential of rotary wing unmanned aerial vehicles (UAVs) to monitor the surfzone. This paper shows that these UAVs are extremely flexible surveying platforms that can gather nearcontinuous moderate spatial resolution and high temporal resolution imagery from a fixed position high above a study site. The rotary wing...journal article 2015
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Shanks, A.L. (author), MacMahan, J. (author), Morgan, S.G. (author), Reniers, A.J.H.M. (author), Jarvis, M. (author), Brown, J. (author), Fujimura, A. (author), Griesemer, C. (author)Larvae of many intertidal species develop offshore and must cross the surf zone to complete their onshore migration to adult habitats. Depending on hydrodynamics, the surf zone may limit this migration, especially on reflective rocky shores. As a logistically tractable analog of a rocky shore environment, we carried out a comprehensive...journal article 2015
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Brown, J.A. (author), MacMahan, J.H. (author), Reniers, A.J.H.M. (author), Thornton, E.B. (author)Cross-shore exchange between the surf zone and the inner shelf is investigated using Lagrangian and Eulerian field measurements of rip current flows on a rip-channeled beach in Sand City, California. Surface drifters released on the inner shelf during weak wind conditions moved seaward due to rip current pulses and then returned shoreward in an...journal article 2015
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- Blokland, P.J. (author), Reniers, G.L.L.M.E. (author) journal article 2015