Print Email Facebook Twitter Video-based monitoring of the Egmond beach- and shoreface nourishments: Evaluation of the 1999 nourishments with the help of the Argus video system Title Video-based monitoring of the Egmond beach- and shoreface nourishments: Evaluation of the 1999 nourishments with the help of the Argus video system Author Caljouw, M. Contributor Stive, M.J.F. (mentor) Aarninkhof, S.G.J. (mentor) Faculty Civil Engineering and Geosciences Date 2000-08-01 Abstract The Dutch coast at Egmond is a highly dynamic region where nourishments of sand are necessary to compensate erosion. In comparison with neigbouring coastal areas the necessary nourishment frequency is relatively high. The latest intervention concerns a combined beach- and shoreface nourishment in the spring and summer of 1999. In order to monitor the evolution of both nourishments and to improve knowledge on local beach processes, an Argus video station was placed. In this report the Argus video images from this station have been analysed with several video based tools. Most important one concerns the waterline detection model, which is used to map intertidal beach bathymetry. It determines the position of the waterline from time averaged Argus images based on color differences between wet and dry beach. The associated vertical elevation is found by hydrodynamic modelling. The model has been validated against a dataset of DGPS surveyed waterlines indicating the accuracy of the model. The root mean square error between model and measurements typically amounts about S meter in cross-shore direction and 10 em in vertical sense. Intertidal beach profiles have been created by modelling multiple waterlines within one tidal cycle. Time series of such profiles show the evolution of intertidal beach morphodynamics at Egmond which reflects the effect of both nourishments. The development and location of the shoreface nourishment in time have been studied by using the differences in image intensity as observed on the Argus images. Finally the results allow an evaluation of the combined beach- and shoreface nourishments and the coastal processes governing the Egmond nearshore zone. Video techniques might contribute importantly to future coastal managemnet decisions concerning coastal interventions at Egmond. Subject nourishmentmodelling To reference this document use: http://resolver.tudelft.nl/uuid:db4db9c2-27cf-43e4-a822-89573748ef35 Publisher TU Delft, Civil Engineering and Geosciences, Hydraulic Engineering Part of collection Student theses Document type master thesis Rights (c) 2000 Caljouw, M. Files PDF ceg_caljouw_2000.pdf 13.56 MB Close viewer /islandora/object/uuid:db4db9c2-27cf-43e4-a822-89573748ef35/datastream/OBJ/view