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Received: 6 March 2019 Accepted: 10 June 2019 Research aimed at evaluating coastal vulnerability to erosion and shoreline encroachment due to flooding-ebbing cycles of waves. Daily cross sectional topographic profiles were measured from the backshore to the lower foreshore in five study stations at 1km interval and surf zone hydrodynamic parameters were monitored. The beach a modern, high energy, mesotidal and dissipative environment with average slope of ≤2° and a width of 90-180 m and sediments were characteristically fine to very fine grained, poorly to very well sorted sands. Volumetric change depicts all the morphozones but the lower foreshore was dominated by net accretion, the upper foreshore recording the highest volume (+ 7.92 m3/m). The lower foreshore had a sediment volume of 15.0 m3/m. Time-averaged beach stability index varies from 140 – 260, 40 – 60, 15 – 30, 10 – 36, and 4 – 120 in stations 1, 2, 3, 4, and 5 respectively and intensity of mobilization decreased with distance from the estuary. Accretion increased with infiltration during tidal flooding indexing a dry beach and low groundwater table. Oversaturation, high groundwater table and exfiltration accounted for erosion at the lower foreshore. Findings are useful for foreshore protection design and prediction of saltwater migration into groundwater aquifers. Beach development for tourism is recommended.

Assessment of Coastal Modification and Surf Zone Induced Erosion in Itak Abasi Beach, Eastern Niger Delta, Nigeria