Abstract
A commonly observed feature of pocket beaches confined by two rocky headlands is that river mouths are located at either end of beaches adjacent to one of headlands. This study presents a theoretical model of instability of river mouth locations in pocket beaches in terms of a linear stablity analysis. The theory shows that river mouths cannot exist stably around the central region of beaches and only can be located at either end of beaches when the load of river sediment supply relative to the dimensions of rivers are comparatively larger than the capability of longshore sediment transport relative to the dimensions of beaches.
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