Empirical Analysis of the Impact of Climate Variability on Coastal Erosion and Maritime Infrastructure in Bayelsa State

Coastal erosion driven by climate variability threatens maritime infrastructure, shoreline communities, and navigational stability in low-lying coastal states such as Bayelsa. This study empirically analyses the relationship between climate variability parameters and coastal erosion dynamics affecting maritime infrastructure along the Bayelsa State shoreline in the South South geopolitical zone. A quantitative research design was employed, utilising multi-temporal satellite imagery analysis to quantify shoreline change over a twenty-year period from 2004 to 2024, combined with sea level data from tide gauge records, rainfall time series analysis, and structural condition assessments of seven coastal jetties and four vessel landing areas. Statistical analysis using linear regression and wavelet coherence methods investigates the association between sea level anomalies, seasonal rainfall extremes, and shoreline retreat rates. Results indicate a mean shoreline retreat rate of approximately 2.1 metres per year along the most exposed sections of the Bayelsa coast, with accelerated erosion during years characterised by above-average seasonal storm activity. Three of the seven inspected jetties show measurable structural damage directly attributable to undermining erosion. The study contributes empirical erosion rate data and climate-erosion statistical relationships that are absent from the existing literature for this specific coastal zone. Recommendations include coastal protection prioritisation mapping and climate-adaptive jetty design standards. Keywords: coastal erosion, climate variability, Bayelsa State, maritime infrastructure, shoreline change