Print Email Facebook Twitter Scour hole development Maasvlakte 1 & 2: Data analyis and forecast Title Scour hole development Maasvlakte 1 & 2: Data analyis and forecast Author Van den Berg, A. Contributor Stive, M.J.F. (mentor) Roelvink, J.A. (mentor) Walstra, D.J.R. (mentor) Vellinga, T. (mentor) Boer, S. (mentor) de Boer, G.J. (mentor) Luijendijk, A.P. (mentor) Faculty Civil Engineering and Geosciences Date 2007-09-28 Abstract Model simulations on the basis of uniform (non-graded) sediment reveal a strong overestimation of the scour hole in the area directly to west of Maasvlakte I when compared to the measured scour hole. Data analysis shows that the scour hole developed in a former complex estuarine system. The analysis strongly suggests that erosion occurred through a number of different old (clay) layers. The presence of cohesive layers can reduce the development of the scour hole considerably. Implementation of cohesive layers in the Delft3d model showed that the erosion rate as observed in reality can be simulated with cohesive sediment. Armouring of the bed, erosion of fine sediments and the harder to erode coarser sediment remains, also result in a reduction of the scour hole. The armouring effect can be simulated in a schematized way by distinguishing a number of fractions and bed layers. Simulations show that armouring indeed reduces the development of the depth of the scour hole. However, the computed erosion is still considerably higher compared to the observed erosion rate. Computations for the Maasvlakte 2 indicate that the main flow characteristics are similar. It is expected that the development of the scour shows much resemblance. Therefore similar parameters can be used for the Maasvlakte 2 situation. The above mentioned mechanisms result in a lower erosion rate for the Maasvlakte 2 situation. The cohesive layers are positioned deeper and therefore the armouring effect is also of importance. The development of the scour hole strongly depends on the bed composition while this composition is vaguely known because of inhomogeneity of the bed. Therefore the predictions of the Maasvlakte 2 are expected to be less accurate. Subject scour holeMaasvlaktearmouringclaylayerdelft3d To reference this document use: http://resolver.tudelft.nl/uuid:078713dd-e8c4-436c-a728-a80b2df67012 Publisher TU Delft, Civil Engineering and Geosciences, Hydraulic Engineering Part of collection Student theses Document type master thesis Rights (c) 2007 A. van den Berg Files PDF ceg_vandenberg_2007.pdf 15.1 MB Close viewer /islandora/object/uuid:078713dd-e8c4-436c-a728-a80b2df67012/datastream/OBJ/view