4209 results

  • Detailed morphodynamic simulations of shoreface nourishment scenarios

    Authors: Werf, J.J. van der; Giardino, A.; Ormondt, M. van; Walstra, D.J.R.; Ramaekers, G. (2009)

  • Consequences of stressor-induced changes in species assemblage for biodiversity indicators

    Authors: Vries, P. de; Dalfsen, J.A. van (2010)
    Published in: Environmental toxicology and chemistry, volume 29 (2010) issue 8, page 1868-1876

  • Modelling shellfish growth with dynamic energy budget models : an application for cockles and mussels in the Oosterschelde (southwest Netherlands)

    Author: Troost, T.A. (2010)

    Dynamic energy budget models for growth of individual cockles (Cerastoderma edule) and mussels (Mytilus edulis) are adjusted and calibrated to the Oosterschelde by formulating and parametrizing their functional responses using an extensive set of field observations. The resulting model predictions fit the observations satisfactorily. Results indicate that food quality and the importance of detritus as a food source are site-specific as well as species-specific.

  • Upward groundwater flow in boils as the dominant mechanism of salinization in deep polders, The Netherlands

    Authors: Louw, P.G.B. de; Oude Essink, G.H.P. (2010)
    Published in: Journal of hydrology, volume 394 (2010) issue 3-4, page 494-506

    As upward seepage of saline groundwater from the upper aquifer is leading to surface water salinization of deep polders in the Netherlands, we monitored the processes involved in the Noordplas Polder, a typical deep polder. Our results show three types of seepage: (1) diffuse seepage through the Holocene confining layer, (2) seepage through paleochannel belts in the Holocene layer, and (3) intense seepage via localized boils. They differ with regard to seepage flux, chloride concentration, and their location in the polder thus, their contributions to surface water salinization also differ. Permeable, sandy paleochannel belts cut through the lower part of the Holocene layer, resulting in higher seepage fluxes than the diffuse seepage through the Holocene layer where there are no paleochannels. The average chloride concentration of paleochannel seepage is about 600 mg/l, which is sixfold higher than the average concentration of diffuse seepage. The highest seepage fluxes and chloride concentrations are found at boils, which are small vents in the Holocene layer through which groundwater preferentially discharges at high velocities. This results in upconing of deeper and more saline groundwater, which produces an average chloride concentration of 1100 mg/l. Despite the fact that seepage fluxes are difficult to measure, we were able to calculate that boils contribute more than 50% of the total chloride load entering the Noordplas Polder and they therefore form the dominant salinization pathway.

  • Zebra mussels as a potential tool in the restoration of eutrophic shallow lakes dominated by toxic cyanobacteria

    Authors: Dionisio Pires, L.M.; Ibelings, B.W.; Donk, E. van (2010)

  • Artificial neural network as a data assimilation tool for error distribution and correction

    Authors: Wang, X.; Gerritsen, H. (2010)

    While numerical flow modelling is an advisable means to study oceanography, it is not perfect due to reasons such as adoption of various simplifying ssumptions, absence of data for proper boundary/initial condition configuration and so on. Local model error prediction has been well recognized to be effective in correcting errors in model predictions. However, such an approach can only be practiced at stations where observations are collected.

  • Melt and collapse of buried water ice : an alternative hypothesis for the formation of chaotic terrains on Mars

    Authors: Zegers, T.E.; Oosthoek, J.H.P. (2010)
    Published in: Earth and planetary science letters, volume 297 (2010) issue 3-4, page 496-504

  • 3D simulation of wave interaction with permeable structures

    Authors: Wellens, P.R.; Borsboom, M.J.A.; Gent, M.R.A. van (2010)

    COMFLOW is a general 3D free-surface flow solver. The main objective in this paper is to extend the solver with a permeable flow model to simulate wave interaction with rubble-mound breakwaters. The extended Navier-Stokes equations for permeable flow are presented and we show the discretization of these equations as they are implemented in COMFLOW.

  • Field performance of scour protection around offshore monopiles

    Authors: Raaijmakers, T.C.; Oeveren, M.C. van; Rudolph, D. (2010)

  • Quantifying biomediated ground improvement by ureolysis large-scale biogrout experiment

    Authors: Paassen, L.A. van; Linden, T.J.M. van der; Star, W.R.L. van der (2010)
    Published in: Journal of geotechnical and geoenvironmental engineering, volume 136 (2010) issue 12, page 1721-1728

    Biogrouting is a biological ground improvement method, in which microorganisms are used to induce carbonate precipitation in the subsurface in order to increase the strength and stiffness of granular soils.

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