document

Multiscale Temporal Response of Salt Intrusion to Transient River and Ocean Forcing

Payo-Payo, Marta (author), Bricheno, Lucy M. (author), Dijkstra, Y.M. (author), Cheng, Weicong (author), Gong, Wenping (author), Amoudry, Laurent O. (author)

Salt intrusion in surface waters endangers freshwater availability, influences water quality, and affects estuarine ecosystem services with high economic and social values. Salt transport and the resulting salinity distributions result from the non-linear interactions between salt and water dynamics. Estuaries are often considered under ...

journal article 2022

document

The Impact of a 3-D Earth Structure on Glacial Isostatic Adjustment in Southeast Alaska Following the Little Ice Age

Marsman, C.P. (author), van der Wal, W. (author), Riva, R.E.M. (author), Freymueller, J. T. (author)

In Southeast Alaska, extreme uplift rates are primarily caused by glacial isostatic adjustment (GIA), as a result of ice thickness changes from the Little Ice Age to the present combined with a low-viscosity asthenosphere. Previous GIA models adopted a 1-D Earth structure. However, the actual Earth structure is likely more complex due to the...

journal article 2021

document

The Evolution of Plume Fronts in the Rhine Region of Freshwater Influence

Rijnsburger, S. (author), Flores, Raúl P. (author), Pietrzak, J.D. (author), Horner-Devine, Alexander R. (author), Souza, Alejandro J. (author), Zijl, Firmijn (author)

The Rhine region of freshwater influence (ROFI) is strongly stratified, rotational, relatively shallow and has large tides, resulting in a dynamic field of fronts that are formed by multiple processes. We use a 3D numerical model to obtain a conceptual picture of the frontal structure and the processes responsible for generating this multiple...

journal article 2021

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Study of Sediment Transport in a Tidal Channel-Shoal System: Lateral Effects and Slack-Water Dynamics

Zhou, Z. (author), Ge, Jianzhong (author), van Maren, D.S. (author), Wang, Zhengbing (author), Kuai, Y. (author), Ding, Pingxing (author)

Lateral flows redistribute sediment and influence the morphodynamics of channel-shoal systems. However, our understanding of lateral transport of suspended sediment during high and low water slack is still fairly limited, especially in engineered estuaries. Human interventions such as dike-groyne structures influence lateral exchange...

journal article 2021

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Observations of Multiple Internal Wave Packets in a Tidal River Plume

Rijnsburger, S. (author), Flores, Raúl P. (author), Pietrzak, J.D. (author), Lamb, Kevin G. (author), Jones, Nicole L. (author), Horner-Devine, Alexander R. (author), Souza, Alejandro J. (author)

Remotely sensed images document the occurrence of multiple packets of internal solitary waves (ISWs) in the Rhine River plume at the same time. We use a combination of field observations, and non-hydrostatic and hydrostatic modeling to understand the processes that lead to the generation and retention of multiple ISW packets within the Rhine...

journal article 2021

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A laboratory and numerical study of transverse momentum exchange in vegetated channels

Truong, S.H. (author), Li, Un (author), Uijttewaal, W.S.J. (author)

Transverse exchange processes of mass and momentum in floodplain regions of channels are of primary importance regarding the sediment transport and riverbank stability. The presence of large horizontal coherent structures (LHCSs) at the interface of the floodplain and main channel regions may contribute up to 90% the amount of transverse...

conference paper 2020

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The Importance of Combined Tidal and Meteorological Forces for the Flow and Sediment Transport on Intertidal Shoals

de Vet, P.L.M. (author), van Prooijen, Bram (author), Schrijvershof, R. A. (author), van der Werf, J. J. (author), Ysebaert, T. (author), Schrijver, M. C. (author), Wang, Zhengbing (author)

Estuarine intertidal areas are shaped by combined astronomical and meteorological forces. This paper reveals the relative importance of tide, surge, wind, and waves for the flow and sediment transport on large intertidal shoals. Results of an intensive field campaign have been used to validate a numerical model of the Roggenplaat intertidal...

journal article 2018

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Beach steepness effects on nonlinear infragravity-wave interactions: A numerical study

De Bakker, A. T M (author), Tissier, M.F.S. (author), Ruessink, B. G. (author)

The numerical model SWASH is used to investigate nonlinear energy transfers between waves for a diverse set of beach profiles and wave conditions, with a specific focus on infragravity waves. We use bispectral analysis to study the nonlinear triad interactions, and estimate energy transfers to determine energy flows within the spectra. The...

journal article 2016

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A laboratory experiment on the evolution of a sand gravel reach under a lack of sediment supply

Orru, C. (author), Chavarrias Borras, V. (author), Ferrara, V. (author), Stecca, G. (author), Blom, A. (author)

A flume experiment was conducted to examine the evolution of a sand-gravel reach under a lack of sediment supply. A bed composed of a bimodal sediment mixture was installed with a uniform slope and an gradual fining pattern. At the upstream end of the flume the initial bed consisted of 100% gravel, which decreased stepwise (10% steps) in...

conference paper 2015

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Modelling aeolian sediment accumulations on a beach

De Vries, S. (author), Van Thiel de Vries, J.S.M. (author), Ruessink, G. (author)

This paper aims to conceptually simulate observed spatial and temporal variability in aeolian sediment transport rates, erosion and deposition on a beach. Traditional strategies of modeling aeolian sediment transport rates do not account for supply limitations that are common on natural beaches. A recently developed 1D linear advection model is...

conference paper 2013

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Flow and bathymetry in sharp open-channel bends: Experiments and predictions

Zeng, J. (author), Constantinescu, G. (author), Blanckaert, K. (author), Weber, L. (author)

This paper focuses on experiments and simulations conducted in very sharp open-channel bends with flat and equilibrium bathymetry, corresponding to the initial and final phases of the erosion and deposition processes, respectively. The study of flow in curved open bends is relevant for flow in natural river configurations, as most river reaches...

journal article 2008

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Morphodynamics of Hue tidal inlets

Lam, N.T. (author), Stive, M.J.F. (author), Verhagen, H.J. (author), Wang, Z.B. (author)

Morphodynamics of a tidal inlet system on a micro-tidal coast in a tropical monsoon influenced region is modeled and discussed. Effects of tides, waves, river flows and system configuration on the inlet morphologies are investigated with the aid of process-based state-of-the-art numerical models. Seasonal and episodic behavior of the inlet...

conference paper 2007

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Modeling of channel patterns in short tidal basins

Marciano, R. (author), Wang, Z.B. (author), Hibma, A. (author), De Vriend, H.J. (author), Defina, A. (author)

We model branching channel patterns in short tidal basins with two methods. A theoretical stability analysis leads to a relationship between the number of channels and physical parameters of the tidal system. The analysis reveals that width and spacing of the channels should decrease as the slope of the bottom profile and the Shields parameter...

journal article 2005

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Spatial flood extent modelling. A performance based comparison

Werner, M.G.F. (author)

The rapid development of Geographical Information Systems (GIS) has together with the inherent spatial nature of hydrological modelling led to an equally rapid development in the integration between GIS and hydrological models. The advantages of integration are particularly apparent in flood extent modelling. In this thesis, the integration of...

doctoral thesis 2004

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Morphodynamic modelling of estuarine channel-shoal systems

Hibma, A. (author)

In this research, the initial formation and long-term evolution of channel-shoal patterns in schematised basins is simulated using a model based on the software package Delft3D. The resulting channel-shoal patterns are validated with field observations, among which the Western Scheldt estuary. This has proven that a complex model is able to...

doctoral thesis 2004

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Uncertainty Analysis applied to Numerical Models of River Bed Morphology

van der Klis, H. (author)

doctoral thesis 2003

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The Current Deflecting Wall: Mitigating harbour siltation; Set-up and integration of physical and numerical modelling techniques

Kuijper, C. (author), Winterwerp, J.C. (author)

report 2003

document

Effect of Different Bar Embedment Length on Bond-Slip in Plain and Fiber Reinforced Concrete

Jankovic, D. (author), Chopra, M.B. (author), Kunnath, S.K. (author)

This research aims to study the behaviour of the concrete-steel bond using numerical models, taking into account the effect of the different bar embedment length. Both plain and fiber reinforced concrete (FRC) are modeled. The interface bond stress as well as load-displacement response of the reinforcing steel is studied. The asociated cracking...

journal article 2001

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The feasibility of implementing radiating boundary conditions in Triwaq

Leendertse, J.J. (author)

This report describes a method for radiating disturbances generated in the computational field through the radiating boundaries. First a simulation is made without disturbances (such as a storm surge) subsequently a second simulation is made with the radiating boundary conditions activated, and the disturbance is able to pass through the...

report 1997

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Experimental monitoring of strain localization and failure behaviour of composite materials

Geers, M.G.D. (author), Peijs, T. (author), Brekelmans, W.A.M. (author), De Borst, R. (author)

journal article 1996