RB
Rik Bisschop
Authored
8 records found
Erosion of sand at high flow velocities
An experimental study
The safety level of a dike is expressed in terms of risk. Risk is defined as the product of the probability of inundation of a polder (after failure of a dike) and the expected damage (casualties, economic damage and damage to the infrastructure) caused by inundation. The rate of
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Dikes constructed from sand generally have a sand core and clay layers on the slopes and the crest to protect the core against erosion. In extreme hydraulic conditions, several failure mechanisms can lead to destruction of the clay layers, exposing the sand core to water. When wa
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Two regimes can be distinguished for the pickup flux of sand. At a Shields parameter of less than about 0.5 (corresponding with flow velocities of 0.5–1 m=s), the erosion process is dominated by the size and density of the grains (grain by grain pickup). At higher flow velocities
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Two regimes can be distinguished for the pickup flux of sand. At a Shields parameter of less than about 0.5 (corresponding with flow velocities of 0.5–1 m=s), the erosion process is dominated by the size and density of the grains (grain by grain pickup). At higher flow velocities
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This paper addresses the sediment pick-up process in the high-velocity range of 2-6 m/s. An existing sediment pick-up function was recalibrated and modified using data of new experiments in a closed pipeline circuit with sand diameters in the range of 50-560 μm. The new pick-u ...
This paper addresses the sediment pick-up process in the high-velocity range of 2-6 m/s. An existing sediment pick-up function was recalibrated and modified using data of new experiments in a closed pipeline circuit with sand diameters in the range of 50-560 μm. The new pick-u ...
Contributed
1 records found
Modelling dike breach formation
Defining the residual strength of dikes during overflow
Dikes constructed of a sand core, clay cover and natural vegetation as (landside) slope protection are common flood defence structures in the Netherlands. The design parameters, such as the crest height of dikes, are determined through risk assessment to reduce the remaining proba
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