4075 resultaten

  • The effect of longshore topographic variation on overwash modelling

    Auteurs: McCall, R.T.; Thiel de Vries, J.S.M. van (2010)

    Paper presented at ICCE2010 in Shanghai.This paper describes an application of the XBeach model to investigate the effect of longshore topographic varianceon overwash. The model is used to simulate the morphological response of an eight-kilometer section of Santa RosaIsland, Florida, due to Hurricane Ivan (2004).

  • Guidelines for capacity reducing gas pockets in wastewater mains

    Auteurs: Pothof, I.W.M.; Tukker, M.J.; Kooij, C. (2011)

    Pressurised wastewater mains in urbanised delta regions include many inverted siphons to cross channels,motorways, railways and other infrastructure. Accumulating gas pockets in these inverted siphons causesignificant capacity losses. These gas pockets are responsible for an estimated annual CO2 release of 10,000 tonin the Netherlands, equivalent to the electric power consumption of 5,400 households.

  • Windows of opportunity : thresholds to mangrove seedling establishment on tidal flats

    Auteurs: Balke, T.; Bouma, T.J.; Erftemeijer, P.L.A. (2011)

    Research Article. Physical processes limiting colonization of bare tidal flats by pioneer mangrove species have commonly been described but not yet quantified. Understanding thresholds to early seedling establishment is critical for successfulrestoration and management of mangrove forests. We determined how seedling establishment of Avicennia alba Bl. is affected by the combination of increasing hydrodynamic forces and sediment dynamics.

  • Improving predictions of water levels and currents for Singapore regional waters through data assimilations using OpenDA

    Auteurs: Wang, X.; Gerritsen, H.; Babovic, V.; Ooi, S.K.; Karri, R.R.. (2011)

    The present paper addresses the improvement of predicting tides and surges through the use of a portable interface for enabling flexible data assimilation and calibration (OpenDA). Through the OpenDA interface an ensemble Kalman Filter (EnKF) is coupled to the hydrodynamic models used to improving boundary forcing. A twin experiment on tidal boundary forcing in a semi-enclosed estuary shows that this data assimilation can improve model results significantly.

  • A simple McGowan specific volume correction for branching in hydrocarbons and its consequences for some other solvation parameter values

    Auteurs: Noort, P.C.M. van; Haftka, J.J.H.; Parsons, J.R. (2011)

    A correction on the McGowan specific volume is derived in terms of the number of branches and the number of pairs of vicinal branches. The main advantage of using branching corrected McGowan specific volumes is that the values of other solvation parameters become chemically more consistent.

  • Data assimilation scheme triggered by Kalman filter for forecasting the sea level anomaly and tidal prediction

    Auteurs: Karri, R.R.; Babovic, V.; Gerritsen, H. (2010)

    The Singapore Regional (numerical) Model simulates barotropic flows driven by tides and meteorological forcing.  The present paper explores the Kalman filter as an effective data assimilation method and establishes the non-linear nature of spatial distribution of errors in the ocean hydrodynamic simulations around Singapore coast. The results show that the data assimilation improves the numerical model results and also efficiently forecasts over the prediction horizon.

  • Composite modelling of interactions between beaches and structures

    Auteur: Gerritsen, H. (2011)

    An overview of Composite Modelling (CM) is presented, based on the EU/Hydralab research project CoMIBBS. Seven case studies of composite modelling are discussed. The focus is on the methodologies used and their impact on the modelling approach, rather than the experiments per se. A link is made with Good Modelling Practice. Guidelines are given on how to decide if composite modelling may be beneficial, and how to set up a composite modelling experiment.

  • Preventing internal erosion phenomena with the biogrout process

    Auteurs: Van, M.A.; Ham, G.A. van den; Blauw, M.; Latil, M. (2011)

    In this paper the results of studies for the possibility of using BioGrout as a piping prevention technique are discussed. In an experimental setup it is shown that piping can be stopped by a BioGrout block.

  • Lowering groynes in the Rhine branches in the Netherlands : an overview of recent studies

    Auteur: Erdbrink, C.D. (2010)

  • Suspended sediment dynamics and morphodynamics in the Yellow River, China

    Auteurs: Maren, D.S. van; Winterwerp, J.C. (2009)

    The Yellow River in China carries large amounts of sediments in suspension at concentrations up to several hundreds of kilograms per cubi metre; the sediment is composed mainly of silt. These high sediment concentrations influence the hydrodynamics (flow velocity and turbulence) which, in turn, determine the sediment concentration profile, whereas both the high sediment concentrations and pseudo-cohesive properties of silt determine the morphodynamics of the Yellow River.

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