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Paalmatrasproeven II : eindige elementenberekeningen
In twee eerdere artikelen werd een aantal resultaten beschreven van een seriepaalmatras laboratoriumproeven. De conclusies die daar werden beschreven kunnen leiden tot goedkopere paalmatrassen. In deze derde publicatiewordt gekeken of deze conclusies worden bevestigd door eindige elementen -berekeningen. Hiervoor worden zowel de paalmatrasproeven als een praktijkprojectgesimuleerd met Plaxis 3D Tunnel. De berekeningsresultaten bevestigende eerder getrokken conclusies.
GeoBrain funderingstechniek : het voorspellingsmodel onder de loep
Presentatie stand van zaken GeoBrain Funderingstechniek, validatie en toepassing.
Draagvermogen van geheide palen in internationale context
Hydrology and coastal morphology at Sao Tomé
The objective of the study consists in performing a coastal geomorphological and hydrological study to help identifying and analyzing coastal risks faced by local communities, accounting for possibleclimate change impact.
Feeding current characteristics of three morphologically different bivalve suspension feeders, Crassostrea gigas, Mytilus edulis and cerastoderma edule, in relation to food competition
Introduced Pacific oysters (Crassostrea gigas) have shown rapid expansion in the Oosterschelde estuary, while stocks of native bivalves declined slightly or remained stable. This indicates that they might have an advantage over native bivalve filter feeders. Hence, at the scale of individual bivalves, we studied whether this advantage occurs in optimizing food intake over native bivalves. We investigated feeding current characteristics, in which potential differences may ultimately lead to a differential food intake. We compared feeding currents of the invasive epibenthic non-siphonate Pacific oyster to those of two native bivalve suspension feeders: the epibenthic siphonate blue mussel Mytilus edulis and the endobenthic siphonate common cockle Cerastoderma edule. Inhalant flow fields were studied empirically using digital particle image velocimetry and particle tracking velocimetry. Exhalant jet speeds were modelled for a range of exhalant-aperture cross-sectional areas as determined in the laboratory and a range of filtration rates derived from literature. Significant differences were found in inhalant and exhalant current velocities and properties of the inhalant flow field (acceleration and distance of influence). At comparable body weight, inhalant current velocities were lower in C. gigas than in the other species. Modelled exhalant jets were higher in C. gigas, but oriented horizontally instead of vertically as in the other species. Despite these significant differences and apparent morphological differences between the three species, absolute differences in feeding current characteristics were small and are not expected to lead to significant differences in feeding efficiency.
Wave attack on sea defences : potential benefits of a composite modelling approach
Design wave loads on a sea defence with a typical sand foreshore are generally determined by means of physical modelling using a fixed bottom andpaying no attention to bottom profile uncertainty. The composite modelling approach described here offers a cost-effective and accurate way to account for bottom uncertainty when determining design wave loads.
Stone stability under uniform flow
Efficient data assimilation method based on chaos theory and Kalman filter with an application in Singapore regional model
Data assimilation is a methodology that utilizes information from observations, and assimilates it into numerical models, with the intention of improving the quality and accuracy of the model outputs.
Palaeo-hydrological reconstruction of a managed fen area in The Netherlands
Knowledge of the anthropogenic impact on the hydrology of low-productive fens that are subject to environmentaldegradation is essential to improve currently utilized hydrological fen restoration strategies.
A software framework for construction of process-based stochastic spatio-temporal models and data assimilation