Searched for: subject:"morphodynamics"
(1 - 20 of 180)

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de Vet, P.L.M. (author)
Intertidal flats — regions of estuaries that emerge every tide from the water — form unique ecosystems. Benthic communities living in the bed are a valuable food source for wading birds. Salt marshes present on these flats further enhance the biodiversity. Through the damping of waves, intertidal flats also contribute to the safety of the...
doctoral thesis 2020
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Phan, M.H. (author)
Coastal retreat problems occur in many deltas over the world. Coastal features are not constant over time and are affected by sea level rise, river runoff, sediment supply, wave and tidal energy, underlying geology and climate. In addition, human activities profoundly influence the coastal processes as a result of changing natural patterns of...
doctoral thesis 2020
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Bosboom, J. (author)
This thesis investigates the behaviour of the often used point-wise skill score, the MSESSini a.k.a. BSS, and develops new error metrics that, as opposed to point-wise metrics, take the spatial structure of morphological patterns into account. The...
doctoral thesis 2020
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Mathew, R. (author), Winterwerp, J.C. (author)
Estuarine sediment dynamics are a consequence of various forcings (barotropic, estuarine circulation, and fluvial) that vary in space and time. Here, we present a study examining sediment dynamics in a narrow microtidal estuary, the Lower Passaic River in New Jersey, USA. The analysis incorporates measurements of suspended sediments,...
journal article 2020
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Cordier, Florian (author), Tassi, Pablo (author), Claude, Nicolas (author), Crosato, A. (author), Rodrigues, Stéphane (author), Pham Van Bang, Damien (author)
Bars are large sediment deposits alternating with deeper areas that arise from alluvial river bed instability and forcing. The present study aimed at investigating the combined influence of flow and longitudinal width variations on the co-evolution between bar pattern and sediment sorting in a sandy-gravel river reach. To this goal, a fully...
journal article 2020
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Elmilady, H.M.S.M.A. (author), Van Der Wegen, M. (author), Roelvink, D. (author), van der Spek, A. (author)
Intertidal shoals are vital components of estuaries. Tides, waves, and sediment supply shape the profile of estuarine shoals. Ensuring their sustainability requires an understanding of how such systems will react to sea level rise (SLR). In contrast to mudflats, sandy shoals have drawn limited attention in research. Inspired by a channel...
journal article 2020
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van Bemmelen, C.W.T. (author), de Schipper, M.A. (author), Darnall, J. (author), Aarninkhof, S.G.J. (author)
Beach scarps are nearly vertical seaward facing sandy cliffs within the cross-shore beach profile. These features are often associated with eroding (nourished) coastlines and can reach heights of O(2–3 m). An analysis of a six-year dataset of beach scarp presence at the nourished Sand Engine beach shows that the formation of beach scarps at the...
journal article 2020
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Wang, Zhengbing (author), Townend, Ian (author), Stive, M.J.F. (author)
Aggregation is used to represent the real world in a model at an appropriate level of abstraction. We used the convection-diffusion equation to<br/>examine the implications of aggregation progressing from a three-dimensional (3D) spatial description to a model representing a system as a<br/>single box that exchanges sediment with the adjacent...
journal article 2020
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Bosboom, J. (author), Mol, M. (author), Reniers, A.J.H.M. (author), Stive, M.J.F. (author), de Valk, C. F. (author)
Although commonly used for the validation of morphological predictions, point-wise accuracy metrics, such as the root-mean-squared error (RMSE), are not well suited to demonstrate the quality of a high-variability prediction; in the presence of (often inevitable) location errors, the comparison of depth values per grid point tends to favour...
journal article 2020
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de Queiroz, Bruna (author), Scheel, F. (author), Caires, Sofia (author), Walstra, D.J.R. (author), Olij, Derrick (author), Yoo, Jeseon (author), Reniers, A.J.H.M. (author), de Boer, W.P. (author)
In process-based numerical models, reducing the amount of input parameters, known as input reduction (IR), is often required to reduce the computational effort of these models and to enable long-term, ensemble predictions. Currently, a comprehensive performance assessment of IR-methods is lacking, which hampers guidance on selecting suitable...
journal article 2019
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Cordier, F. (author), Tassi, P. (author), Claude, N. (author), Crosato, A. (author), Rodrigues, S. (author), Pham Van Bang, D. (author)
Rivers typically present heterogeneous bed material, but the effects of sediment nonuniformity on river bar characteristics are still unclear. This work investigates the impact of sediment size heterogeneity on alternate bars with a morphodynamic numerical model. The model is first used to reproduce a laboratory experiment showing alternate...
journal article 2019
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Arkesteijn, L. (author), Blom, A. (author), Czapiga, Matthew J. (author), Chavarrias Borras, V. (author), Labeur, R.J. (author)
An engineered alluvial river (i.e., a fixed-width channel) has constrained planform but is free to adjust channel slope and bed surface texture. These features are subject to controls: the hydrograph, sediment flux, and downstream base level. If the controls are sustained (or change slowly relative to the timescale of channel response), the...
journal article 2019
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Vargas-Luna, Andrés (author), Duro, G. (author), Crosato, A. (author), Uijttewaal, W.S.J. (author)
While the scientific community has long recognized that alluvial rivers are the product of interactions between flowing water and bed material transport, it is increasingly evident that vegetation mediates these interactions and influences the stream channel characteristics. In a novel set of mobile bed laboratory experiments with variable...
journal article 2019
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Elias, Edwin P.L. (author), van der Spek, A.J.F. (author), Pearson, S.G. (author), Cleveringa, Jelmer (author)
Ameland inlet is centrally located in the chain of West Frisian Islands (the Netherlands). A globally unique dataset of detailed bathymetric charts starting in the early 19th century, and high-resolution digital data since 1986 allows for detailed investigations of the ebb-tidal delta morphodynamics and sediment bypassing over a wide range of...
journal article 2019
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Luijendijk, A.P. (author), de Schipper, M.A. (author), Ranasinghe, Roshanka (author)
Thirty one percent (31%) of the world's coastline consists of sandy beaches and dunes that form a natural defense protecting the hinterland from flooding. A common measure to mitigate erosion along sandy beaches is the implementation of sand nourishments. The design and acceptance of such a mitigating measure require information on the expected...
journal article 2019
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Brand, Evelien (author), De Sloover, Lars (author), De Wulf, Alain (author), Montreuil, Anne Lise (author), Vos, S.E. (author), Chen, Margaret (author)
Sediment transport is a key element in intertidal beach morphodynamics, but measurements of sediment transport are often unreliable. The aim of this study is to quantify and investigate cross-shore sediment transport and the resulting topographic changes for a tide-dominated, sandy beach. Two fortnight-long field experiments were carried out...
journal article 2019
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Elmilady, H.M.S.M.A. (author), van der Wegen, M. (author), Roelvink, D. (author), Jaffe, B. E. (author)
Anticipated sea level rise (SLR) threatens intertidal areas and associated ecosystems in estuaries worldwide. There is a need to develop validated modeling tools to assess the impact of SLR on estuarine morphodynamics. This study explores the morphological impact of SLR on a channel-shoal system in San Pablo Bay, a subembayment of San...
journal article 2019
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van der Wegen, M. (author), Roelvink, D. (author), Jaffe, B. E. (author)
Intertidal mudflats are morphodynamic features present in many estuaries worldwide. Often located between vegetated shores and deep channels they comprise valuable ecosystems and serve to protect the hinterland by attenuating waves. Although mudflats are persistently present on yearly to decadal time scales, little is known on their...
journal article 2019
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Cohn, Nicholas (author), Hoonhout, B.M. (author), Goldstein, Evan B. (author), de Vries, S. (author), Moore, Laura J. (author), Vinent, Orencio Durán (author), Ruggiero, Peter (author)
Coastal landscape change represents aggregated sediment transport gradients from spatially and temporally variable marine and aeolian forces. Numerous tools exist that independently simulate subaqueous and subaerial coastal profile change in response to these physical forces on a range of time scales. In this capacity, coastal foredunes have...
journal article 2019
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Meerman, C.J. (author), Rottschäffer, Vivi (author), Schuttelaars, H.M. (author)
The existence of cross-sectionally averaged morphodynamic equilibria of tidal inlets is investigated, using a cross-sectionally averaged model, and their sensitivity to variations of geometry, deposition parameter, frictional effects and advective sediment transport is analysed. Different geometries, from exponentially converging to...
journal article 2019
Searched for: subject:"morphodynamics"
(1 - 20 of 180)

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