Print Email Facebook Twitter Morphological evaluation of the Scheveningen, Katwijk and Noordwijk shoreface nourishments using UNIBEST-TC Title Morphological evaluation of the Scheveningen, Katwijk and Noordwijk shoreface nourishments using UNIBEST-TC Author Burger, M. Contributor Stive, M.J.F. (mentor) Van de Graaff, J. (mentor) Spanhoff, R. (mentor) Huisman, P. (mentor) Faculty Civil Engineering and Geosciences Department Hydraulic Engineering Date 2003-04 Abstract Parts of the sandy Dutch coast are liable to structural erosion. If this structural erosion would not be counteracted a considerable part of the coastal region will be lost in time. The Dutch have been counteracting this erosion for hundred of years. Since the nineties of the last century by means of sand nourishments. At first these nourishments were applied as beach nourishments. Since the execution of a large scale shoreface nourishments at the Dutch Wadden island of Terschelling in 1993 and the unexpected positive effect of this type of nourishment shoreface nourishments are the primary tool to counteract structural erosion. Along the southern part of the Dutch coast several shoreface nourishments have been applied within a coastal stretch of some thirty kilometre relatively short after each other. Since completion of these nourishments their morphological development has been monitored and evaluated. From this evaluation it appeared that these nourishments show mutually different morphological behaviour. In the present study three shoreface nourishments are further evaluated; the Scheveningen nourishment applied in 1999, the Katwijk nourishment applied in 1998/1999 and the Noordwijk nourishment applied in 1998 Using survey data collected since completion of the nourishments the morphological development per site is investigated. The morphological development of the entire nourishment area and the profile development of several cross-shore transect along each nourishment are investigated. During this investigation several possible causes for the mutually different morphological development are identified, resulting in the following research questions: * What is the effect of the presence of breakwaters and the possible shelter for waves provided by these breakwaters on the morphological development. * What is the effect of the encountered wave climate as experienced by the different nourishments. * What is the effect of the presence of groynes on the morphological development. To increase the insight into these possible causes hindcast simulations are performed using the morfodynamic model UNIBEST-TC. The UNIBEST-TC model computes cross-shore transport rates and resulting profile development under the combined action of waves, wind and tidal currents. From the outcomes of the simulations performed with UNIBEST-TC the following conclusions can be drawn. * The Scheveningen harbour breakwaters proved some kind of shelter for waves originating from south westerly directions. This shelter is partly responsible for the small morphological changes seen for the Scheveningen shoreface nourishment. * No clear effect of the presence of groynes and the assumed offshore shift of the longshore tidal velocity due to the presence of these groynes on the cross-shore profile development of the Scheveningen nourishments site can be observed. * The differences in encountered wave climate due to the different times of application of the nourishments is not responsible for the observed differences in morphological development between the different nourishment sites. To reference this document use: http://resolver.tudelft.nl/uuid:7eeeaa09-f56a-44ba-9913-2018126e5dc3 Publisher TU Delft, Faculty of Civil Engineering and Geosciences, Hydraulic Engineering Part of collection Student theses Document type master thesis Rights (c) 2003 M. Burger Files PDF 2003Burger.pdf 10.21 MB Close viewer /islandora/object/uuid:7eeeaa09-f56a-44ba-9913-2018126e5dc3/datastream/OBJ/view