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• W399382869 abstract "The object of investigation of this study was the behaviour of reclaimed sand slopes when not constructed in an equilibrium state, but in a steeper profile. When constructing a steep slope, this slope will gradually become more flat and would periodically require sand nourishments. In this way part of the initial sediment placement would be postponed, or part of the initial sediment placement may even prove unnecessary. Both effects may result in an overall less expensive design. Questions that arise are the following; how and how fast will the profile change? What will be the final state of the profile? After an inventory into the available tools to resolve this problem, known theory, a number of sea bottom height measurements and computer models came up as the tools to solving this problem. The theory provided insight in the final state of the profile. Sea bottom measurements are available of the Slufter dam. They gave insight in the losses of volumes in the profile in all different directions, making the measurements very useful when applied in combination with the third tool, computer programs. A computer program provides the rest of the insight in the behaviour of steep reclaimed profiles. The quasi 3-dimensional UNIBEST-TC computer model was found most suiting. A North Sea wave climate representative for a long period of time is obtained as well as insight in the way the computer model reacts to changes in parameter settings and wave climate input changes. The computer model showed great sensitivity to a number of the model parameters, as well as to the used grain size. After this wave climate input and insight in the behaviour of the computer model were obtained, two calibration procedures were done, one for average wave climate conditions and one for storm conditions. The average wave climate calibration was done by correctly modelling the earlier obtained insight in lost volumes as well as correctly modelling the shape of the used measured profiles. The storm climate calibration was done by modelling the change in shape of a profile during a scale test of a storm. A single steep profile, chosen for its easy way of construction, was chosen for further calculations. The calculation for a single storm on this profile resulted in a loss of approximately 30 meters of land. The profile reacted to a moderate North Sea wave climate by loss of volume in offshore direction. These losses showed an exponential decay in time. Next to these cross-shore losses of volume, also a longshore loss of volume is present, which is constant in time. After approximately 25 years, the longshore losses become more important than the cross-shore losses, and the remaining total losses become more constant in time. There is a maximum to the cross-shore losses, which is practically reached in approximately 30 years. After this, a stable profile remains. This profile has a shape within the breaker zone similar to a Dutch equilibrium profile. Further offshore from the NAP 6 m line, a still rather steep section in the profile remains, leading to the original seabed. When a severe storm is introduced every 5 years, the adaptation of the profile will occur approximately 20% faster. The maximum to the cross-shore losses is the same as for an average wave climate without storms. The final state, after approximately 25 years, is a dynamic equilibrium in which damage done during storms is recovered in the years after." @default.
• W399382869 created "2016-06-24" @default.
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• W399382869 date "2003-01-01" @default.
• W399382869 modified "2023-09-24" @default.
• W399382869 title "Behaviour of a steep reclaimed profile exposed to a North Sea wave climate" @default.
• W399382869 hasPublicationYear "2003" @default.
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