Grain size is an important input parameter for longshore transport calculations. However, measurements and sampling in the longshore transport zone can be difficult and costly. This paper presents initial investigations aimed at predicting the median grain size in the longshore transport zone, based on measuring only the beach grain size. The data analysed to date suggests that the longshore transport zone grain size is close to half that found on the beach. Factors that could influence this relation are mentioned. The work is ongoing.
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