Revision of Coastal Dynamics and Morphometric Study of Andoni -Bonny Beach, Rivers State, Nigeria

Coastal dynamics is pivotal to seasonal alterations of beaches, even as natural and or anthropogenic activities may be implicated in such dynamics. This study unveiled coastal dynamics and its consequences along Andoni and Bonny beaches of Rivers State, Nigeria, using divers’ techniques of Morphometric Analysis at the beach/ shoreline, such as Remote Sensing, Geographic Information Systems (GIS), Field Survey and Laboratory Analysis. Values were extracted from Satellite Imageries of Landsat 7 (2005), Landsat 7(2015) Enhanced Thematic Mapper (ETM), and Landsat 9 (2025). The slope variation from shuttle Rader Topographic Mission (SRTM) ranged from 0.1 – 4.3m and the Landsat Slope ranged from 0.1 – 50.22m. This indicated a variation on the shoreline/beach slope. Wire frame results indicated a depression at 12m, 10m and 8m along Bonny Beach/ shoreline, but Andoni beach counterpart had a depression at 6m, 4m and 2m respectively. The inter-variable covariance, inter-variable correlation and inter-variable rank-correlation showed a change in height value along the shore. The laboratory results of grain size (fines 91- 94%), bulk density (1.10 – 1.40g/cm³), porosity (37 – 48%), moisture content (22 – 28%) and texture (silt loam) also indicated shoreline prone to erosion. Bonny beach had a comparatively high sediment load to Andoni beach; (1.68%) and (-1.00%) respectively, which unveiled an intense hydrodynamic activity in Bonny beaches which was consistent with high energy coastal system while Andoni showed a low energy environment. The alteration between high and low water zones unveiled the role of tidal dynamics in sediment redistribution along Andoni and Bonny Beaches/Shoreline. This study, besides unveiling the dynamics on the coast of Andoni and Bonny beaches, upholds the significance of applying morphometric parameters in coastal zone management.