Abstract
Measurements of the penetration resistance of beach sands on a gently sloping (1:50) high tidal range (9.5 m) beach are described. It has been found that at any one position the penetration resistance reaches a maximum value about 1 hour before that section of the beach is submerged by the incoming tide, and that this maximum value is largest at the mid-tide level. This behaviour cannot be explained by a tidally induced change in the beach water table alone and it is suggested that spatial changes in penetration resistance may be related to the varying amounts of exposure of the beach face to wave activity in the surf zone as the latter is swept in and out over the beach face by the tide. In particular a “cut and fill” mechanism would lead to the observed variations in compaction of the beach sediment and additionally a momentary failure of the beach face under breaking waves might give similar results.
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