Abstract
Several methods of monitoring sediment transport exist and have varying degrees of success depending on the study sites characteristics. Grain Size Trend Analysis (GSTA) is an experimental method based on identifying transport trends from the variation of sediment grain characteristics within a defined study area. The parameters examined when performing GSTA are mean grain size, sorting coefficient and skewness, the most common cases found in field studies being; finer, better sorted and negatively skewed (FB−) or coarser, better sorted and positively skewed (CB+), as most transport trends follow one or the other trend. However, on Rossbeigh beach, Co. Kerry, Ireland, a coarser poorer and more negatively skewed (CP−) trend case gave the most realistic plot of sediment transport trend when compared with sediment transport calculation, bathymetry surveys, hydrodynamic monitoring and morphological modelling.
Highlights
Tracking sediment transport in the coastal zone has traditionally proven a difficult task due to the dynamic action of waves and tidal currents combined with large volumes of entrained sediment
The basic theory behind grain size trend analysis (GSTA) is inferring sediment transport pathways from variations in sediment grain size characteristics sampled within the study area
There are 8 different cases for Grain Size Trend Analysis (GSTA), these relate to the various permutations of the three parameters, mean grain size, sorting and skewness
Summary
Tracking sediment transport in the coastal zone has traditionally proven a difficult task due to the dynamic action of waves and tidal currents combined with large volumes of entrained sediment. The need for data in this area is often critical to erosion and beach evolution studies, as most of the initial movement occurs in this zone This was the case when undertaking a morphodynamic study of the breached barrier dune system in Dingle Bay, Co. Kerry, Ireland. The loss of amenity and habitats is already occurring with the removal of protected dune; the change in sediment transport patterns is increasing sedimentation in the back barrier area and affecting aquaculture It is the reported [1] increase in flooding since the breaching event, that is potentially the greatest impact of the erosion in Rossbeigh. A comprehensive examination of the entire coastal cell of Inner Dingle Bay was undertaken required before the extreme erosion occurring on Rossbeigh and the morphodynamics of the barrier beach system could be understood (2) Provide a case study into the accuracy and applicability of the GSTA method in inlet-ebb tidal bar scenario
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