Sand nourishments are a widely applied technique to increase beach width for recreation or coastal safety. As the size of these increases, new questions arise on adaptation system after such large unnatural shapes have been implemented. This paper presents initial morphological evolution implementation mega-nourishment project at Dutch coast intended feed surrounding beaches. In total 21.5 million m3 dredged material was used two shoreface and sandy peninsula. The Engine peninsula, highly...

Research Article| April 01, 2014 Bank pull or bar push: What drives scroll-bar formation in meandering rivers? Wietse I. van de Lageweg; Lageweg Faculty of Geosciences, Department Physical Geography, Utrecht University, P.O. Box 80115, 3508 TC Utrecht, Netherlands Search for other works by this author on: GSW Google Scholar Wout M. Dijk; Dijk *Current address: Durham South Road, DH1 3LE, UK. Anne W. Baar; Baar Jantien Rutten; Rutten Maarten G. Kleinhans † †E-mail: M.G.Kleinhans@uu.nl....

Shore-based remote sensing platforms are increasingly used to frequently (~daily) obtain bathymetric information of large (~km <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ) nearshore regions over many years. With recorded wave frequency Ω and wavenumber k (and hence phase speed c = Ω/k), bed elevation z <sub xmlns:xlink="http://www.w3.org/1999/xlink">b</sub> can be derived using a model that relates water depth. However, the accuracy...

Abstract Massive quantities of the pelagic brown macroalgae Sargassum spp. (sargassum) have been invading Caribbean and West African shores since 2011, causing devastating effects on coastal ecosystem local economy. Little is known about sargassum beaching dynamics capacity system to naturally remove beached sargassum. Here, we characterize temporal variation in arriving a reef lagoon using 5.2‐year data set hourly optical imagery, identify governing hydrometeorological conditions. Image...

Abstract Nearshore hydro- and morphodynamic data were collected during a field experiment under calm conditions, moderate storm conditions with dune erosion in the collision regime. The was conducted on Sand Engine near Kijkduin, Netherlands, from October 18, 2021, to January 7, 2022. Two artificial unvegetated dunes constructed just above high water line measure impacts higher levels waves. During experiment, three storms occurred that resulted significant of both dunes. hydrodynamic...

Abstract Sandbars, submerged ridges of sand parallel to the shoreline, affect surfzone circulation, beach topography and width. Under time‐varying wave forcing, sandbars may migrate onshore offshore, referred as two‐dimensional (2D) behaviour, vary in planshape from alongshore uniform non‐uniform through growth decay three‐dimensional (3D) patterns, 3D behaviour. Although 2D sandbar behaviour is reasonably well understood along straight coasts, this not case for curved where curvature can...

High-resolution wave measurements at intermediate water depth are required to improve coastal impact modeling. Specifically, such data sets desired calibrate and validate models, broaden the insight on boundary conditions that force models. Here, we present a set collected in North Sea three stations (6–14 m) during 2021/2022 storm season as part of RealDune/REFLEX experiments. Continuous synchronized surface elevation, velocity pressure were recorded 2–4 Hz by Acoustic Doppler Profilers an...

Large (mega-scale) nourishments have been proposed as a promising alternative for traditional beach and shoreface nourishments, especially locations with large structural erosion sufficient sediment to dredge. This paper examines the initial bathymetric evolution of Sand Engine, mega-nourishment 17 million m3 protruding almost 1 km seaward from its surrounding coast. Topographic surveys show that, despite blunt shape nourishment, is reworked into nearly symmetrical (bell curve like) in less...

High-resolution wave measurements at intermediate water depth are required to improve coastal impact modeling. Specifically, such data sets desired calibrate and validate models, broaden the insight on boundary conditions that force models. Here, we present a set collected in North Sea three stations (6-14~m) during 2021/2022 storm season as part of RealDune/REFLEX experiments. Continuous synchronized surface elevation, velocity pressure were recorded 2-4~Hz by Acoustic Doppler Profilers an...

Sandbars, submerged ridges of sand parallel to the shoreline, tend develop crescentic patterns while migrating onshore. At straight coasts, these form preferably under near‐normal waves through generation circulation cells in flow field, whereas they decay energetic oblique with associated intense alongshore currents. Recently, observations at a man‐made convex curved coast showed an variability patterning that seems related spatiotemporal local wave angle (Sand Engine). Here, we aim...

Infragravity (IG) waves are relatively long with typical periods of several tens seconds to minutes. The energy at the IG band plays an important role in nearshore areas. For example, can significantly contribute dune erosion and sediment transport (e.g., Roelvink et al., 2009), may excite harbor oscillations Bowers, 1977). Furthermore, result destructive inundation events Roeber Bricker, 2015). These documentations waves' impacts emphasise necessity account for contributions as part coastal...

Concentrated mega-nourishments, built as coastal protection measures for decadal time scales, are intended to diffuse, that is erode and supply sand the nearby beaches dunes by profiting of natural drivers. Here, we aim quantify role wave incidence angle initial geometry on long-term evolution in particular Zandmotor (the Netherlands), using a nonlinear morphodynamic model large-scale shoreline dynamics. Synthetic climates based measurements created systematically vary conditions....

Storm conditions can lead to excessive dune erosion with potential floods as a consequence. Barrier islands and low-lying countries protected by dunes are especially vulnerable erosion. To properly assess the risks these areas face, clear understanding of physical processes during is required. One such effect wave obliquity on sediment transport in surf zone. Classic models assume that volumes decrease under oblique attack, because time-averaged cross-shore undertow decreases magnitude...

Infragravity (IG) waves are key drivers for coastal erosion and thus need to be properly included in process-based modelling of hazards. Uncertainties remain regarding the offshore boundary conditions these long waves. Typically, only bound IG at boundary, which means that possible contribution free waves, such as those radiated from distant coastlines, is neglected. Recent studies however suggest incoming could significant, particularly semi-enclosed basins North Sea where they contribute...