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Significance of bed slope effects and non-equilibrium sediment transport on bed form evolution process : a numerical analysis using detailed hydrodynamics
In order to clarify the effect of bed slope on bed deformation process, we have performed numerical analysis of bed form evolution using Kovac's and Parker's formula, wich is based on Ashida and Michiue's bedload transport formula, incorporates the local slope effect. Furthermore, attempts have been made to compare the simulation results between various cases of sediment transport approach, namely using Ashida and Michiue's formula (i.e., no slope correction), Kovac's and Parker's formula with slope correction and finally Nakagawa and Tsujimoto's non-equilibrium transport formula.
Spectral wave modelling in tidal inlet seas : results from the SBW Wadden Sea project
Over the last five years a research program has been carried out to assess the performance of the spectral wave modelSWAN in the Wadden Sea so that it may be used for the transformation of offshore wave conditions to wave boundaryconditions near the sea defenses (dikes and dunes).
Optimizing a cooling water outfall inside the Maasvlakte 2 port extension : dealing with conflicting requirements
Presently, a large power plant in the Port of Rotterdam discharges its cooling water through a permeable breakwater directly into the North Sea. The future Maasvlakte 2 port extension (MV2) will encompass this outfall location and in the new layout nautical activities are planned nearby.
The use of MOGREPS ensemble rainfall forecasts in operational flood forecasting systems across England and Wales
This paper presents research funded by the Environment Agency in which ensemble rainfall forecasts are utilised and tested for operational use.
Discussion on Three-dimensional (3D) modeling of non-uniform sediment transport in a channel bend with unsteady flow
Discussion of the article by Eric Mosselman.
Gravel beaches with seawalls
This paper focusses on some fundamental aspects of gravel beaches and revetments with dynamic rock slopes. Obviously, the response of gravel beaches depends on parameters such as the wave height and the stone size. Here, other parameters such as the permeability of the subsoil, the influence of sand in the pores of gravel, and the influence of seawalls have been studied.
Operational scour management for safe jack-up operations
Scour is an imminent threat for jack-up operations in shallow waters with sandy seabed conditions, strong tidal currents and/or a harsh wave climate, such as the North Sea. Jack-up operations in scour-sensitive areas require jack-up operators to evaluate the risk of scour and to adapt a scour management strategy in order to safeguard against foundation failure. Jack-up deployments are characteristically short term operations.
Controls on river delta formation : insights from numerical modelling
Primary hydraulic and sedimentary controls on river deltas were previously postulated in classification schemes based on many field observations. The authors use detailed numerical modelling to assess the influence of wind-generated waves and tides on clastic river delta formation. The results provide a framework for physics-based river delta modelling under various environmental conditions.
Advances in data assimilation for operational hydrologic forecasting
The abundance of new hydrologic observations (in situ or remotely sensed) in the past couple of decades has stimulated a great deal of research into the use of these observations for improved hydrologic predictions via model-data infusion applications. The workshop was attended by 34 participants from 12 different countries. This workshop was jointly organized by Deltares and the Office of Hydrologic Development, National Weather Service, National Oceanic and Atmospheric Administration (NOAA), with major funding through the Flood Control 2015 project.
Numerical simulations of upstream and downstream overdeepening
Local geometrical perturbations of alluvial channels can generate a pattern of non-migrating bars and pools. This phenomenon is known as "overdeepening", because the pools locally enhance the scour in river bends. Overdeepening occurs only downstream of a perturbation if the channel is in the subresonant and subcritically damped regime, which corresponds to channels with moderate width-to-depth ratios.