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Experiments by Invited Researchers

 

Coupled high frequency measurement of swash sediment transport and morphodynamic

Project acronym: HyIV-CIEM-02
Name of Group Leader: Dr. Jose M. Alsina
User-Project Title: Coupled high frequency measurement of swash sediment transport and morphodynamic
Facility: CIEM Flume
Proceedings TA Project: SEDIMENT TRANSPORT AND BEACH PROFILE EVOLUTION INDUCED BY BICHROMATIC WAVES WITH DIFFERENT GROUPING PERIODS
Data Management Report: Report

User-Project Objectives

The main aim of the present Hydralab access is to increase the understanding of the nearshore sediment dynamics by performing outstanding nearshore morphodynamic measurements. It will be the first time that simultaneous measurements of the total sediment transport and bottom evolution in the inner surf zone (ISZ) and SZ would be performed, making the most of new instrumentation recently developed. These measurements (total transport in the SZ) have been largely sought by the international research community but not been obtained as yet due to the complexity of the task. Our group is ideally positioned to perform such measurements due to the experience of some participant in developing new techniques to measure sediment transport (Ribberink et al., 2008) and the experience in undertaking SZ laboratory and field experiments (Peña et al, 2008).

Short description of the work carried out

All planed experiments have been done without major problems. The reshaping of the beach up to initial 1/15 conditions is a piece of work that could be improved.

Highlights of important research results

All bi-chromatic wave conditions resulted in shoreline erosion and the formation of a breaking bar. The position of the breaking bar respect to the initial shoreline is shown to vary as a function of the bi-chromatic group period increasing the distance respect to the inital shoreline as increases the wave group period. Also the shoreline retreat is shown to vary as a function of the wave grouping reducing the shoreline retreat as increases the wave group period, although this influence is not as evident as for the bar location.

Publications
J. van der Zanden, J.M. Alsina, I. C?ceres, R.H. Buijsrogge, J.S. Ribberink NEW CCM TECHNIQUE FOR SHEET FLOW MEASUREMENTS AND ITS FIRST APPLICATION IN SWASH ZONE EXPERIMENTS , 2012

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