Abstract
The unique Ambalapuzha mudbank in Kerala along the southwest coast of India occurs as a small patch in the pre-monsoon (February–May) season, and increases in both the alongshore and the cross-shore directions as the monsoon (June–September) progresses. This mudbank was observed to be dynamic in character, both with respect to its position and geometry. Beach profile changes were monitored monthly for a period of one year, based on which the volume of beach sediment was computed. Simultaneously the dimensions of the mudbank were monitored in relation to monthly beach profile changes. We observed that the volume of sediment was larger in all seasons along the beach bounded by the mudbank. Sediment accretion and erosion were observed along the beach to the north of the mudbank zone during the monsoon, while erosion was observed south of the mudbank zone. Grain size studies revealed the beach sediment to be medium sized sand. Beach sediment to the north of the mudbank zone, where accretion took place, was observed to be relatively coarse, while that to the south of the mudbank zone, where erosion takes place, was finer.
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