Publication Date

Spring 2025

Abstract

This study investigates the patterns and drivers of coastal erosion on Misali Island,located off the coast of Pemba Island in the Zanzibar Archipelago. Fieldwork was conducted over a 28-day period, focusing on four beachfront locations along Baobab Beach. Measurements included strike and dip, beach crest-to-toe distance (m), beach step height (cm), sand composition and sand color, velocity, coral composition, and a rate of sediment accumulated per day. These data, combined with qualitative observations, reveal spatial variability in sediment deposition and erosion severity across the island’s coastline. Results suggest that reduced coral cover and increased exposure to wave energy are contributing to sediment destabilization, especially near heavily eroded areas. The findings do not reject the hypothesis that coral reef degradation significantly exacerbates shoreline retreat by limiting natural barriers to wave action. This study highlights the urgent need for integrated coastal management strategies that prioritize reef restoration to mitigate erosion and preserve the ecological and economic integrity of small island environments like Misali.

Disciplines

Physical Sciences and Mathematics

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