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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.
The Rhine delta : a record of sediment trapping over time scales from millennia to decades
Dissolved organic nitrogen dynamics in the North Sea : a time series analysis (1995-2005)
Dissolved organic nitrogen (DON) dynamics in the North Sea was explored by means of long-term time series of nitrogen parameters from the Dutch national monitoring program. Generally, the data quality was good with little missing data points. Different imputation methods were used to verify the robustness of the patterns against these missing data. No long-term trends in DON concentrations were found over the sampling period (1995e2005).
Application of bioassays in toxicological hazard, risk and impact assessments of dredged sediments
Operational modelling applications for coastal engineering : new developments
This paper describes three different ongoing developments andapplications of operational coastal modelling systems: 1) The development of an operational model to simulate storm impact along the Dutch and Emilia-Romagna coast 2) The application of operational modelling to predict bathing water quality along the Emilia-Romagna coast (Adriatic Sea, Italy)3) Ongoing developments of operational models into enhance the safety of swimmers.
Training for crisis response with serious games based on early warning systems
This paper discusses serious games developed as part of a training program developed for a Dutch crisis response group, which acts during a (potential) flooding crisis. Serious games can be a useful and educational addition to the set of existing training tools. For operational crisis response groups a high match with real-time warning systems is essential. Our approach shows how to integrate both serious games and early warning systems for effective training and exercises.
Modeling of a mixed-load fluvio-deltaic system
Present-day observations and classical classification schemes of alluvial deltas address channel dynamics and multiple sediment fractions. However, high-resolution physics-based mathematical models have not been applied to address formation of both fluvio-deltaic channels and diffluences and confluences, and their stratigraphy. Here, the authors present a simulated delta system under riverine forcing that shows striking similarity to its counterparts recognized in field and laboratory studies.