Zoek binnen publicaties
The use of common sense in urban drainage modelling
Models of urban drainage systems are of increasing complexity in terms of detailing of process descriptions. Over the past decade, modelling systems have also become more robust and may produce realistic looking results even if inadequate process descriptions or schematizations have been applied. Detailed checking of results of such models is not possible and even good calibrations do not at all provide a guarantee that such models produce correct results for extreme events with parameter values applied under extrapolated conditions. It is the responsibility of the modeller to judge model results at least on the basis of common sense. Education of urban drainage modellers should address this responsibility.
CFD simulations of a semi-submersible with absorbing boundary conditions (draft)
Proc. 28th Int. Conf. on Ocean, Offshore and Arctic Eng. (OMAE 2009), Honolulu, Hawaii, May-June 2009, ASME.
Spit island formation and development
Intl. Conf. on Coastal Engineering (ICCE), Hamburg, Germany.
A framework for integrated flood risk management
Little of the European coast line or land area has escaped human influence, with increasing pressures over generationsof settlement, agriculture, industry and commerce. The pressures include water and flood management activities whichcontrol the extent and frequency of floods and the drainage of water from the land. Internationally, policies and practicein flood risk management are evolving in response to many drivers. See www.floodsite.net.
Stability of breakwater roundheads during construction
The presented study focussed on issues related to the hydraulic stability during the construction of rubble mound breakwaters. During construction the temporary roundheads differ from the roundheads in the final stage. Often a submerged uncompleted part of the breakwater is present in front of the section that reached its final crest elevation. Three-dimensional physical model tests were performed to analyse the influence of the submerged part on the stability of the emerged part.
Storm surge modelling in the South China Sea
Sea level anomalies (SLA) due to different phenomena have been observed in various parts of the South China Sea (SCS). Excluding tsunamis, the largest anomalies are classified as storm surges. Storm surges in the most southwestern part of the SCS are associated with a strong persistent wind blowing along the longest axis of the sea, roughly passing through Taiwan and Singapore.
Oblique wave attack on cube and rock armoured rubble mound breakwaters
Stability formulae for armour layers of rubble mound breakwaters are usually being applied assuming perpendicular wave attack. Often it is assumed that for oblique wave attack the reduction in damage compared to perpendicular wave attack is small. This seems however a very conservative assumption. Wave basin tests at Deltares provide information to assess the effects of oblique waves on the stability of rock slopes and cube armoured rubble mound breakwaters.
Updated Abraham solvation parameters for polychlorinated biphenyls
An updated set of PCB solvation parameters was derived from four PCB properties and associated Abraham solvation equations.
Model error prediction using neural networks combined with chaos theory
This paper presents a time series prediction scheme using time-delay neural networks combined with chaos theory. To achieve reliable multi-step-ahead prediction, the optimal architecture of networks is determined by average mutual information and false nearest neighbours analyses in chaos theory. The resulted networks are applied to predict the model errors at 4 tidal stations in the Singapore Regional Model domain, with 5 prediction horizons ranging from 2 hours to 96 hours.
Free slip plane analysis of a strip footing using a genetic algorithm
A strip footing is a uniform load with infinite length in the third dimension. The safety of sucha load has been subject of investigation for a quite a long time. By ignoring the weight and internal friction ofthe soil, a number of upper- and lower bounds can be derived for the bearing capacity. This paper presents anupper bound method that gives the same result as the lower bound. In other words, the exact bearing capacityis derived. Even though the algorithm used is presented on a basic case, any geometry and subsoil configuration can be analyzed.