Spatial Variation of Sediment Grain Size and Its Environmental Implications in the Anoi Itam Coastal Waters, Pulau Weh, Indonesia
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Abstract
This study investigates the grain-size distribution and sediment characteristics of the Anoi Itam coastal waters, Sabang City, Aceh Province, Indonesia. The objective was to determine spatial variations in sediment texture and their relationship with hydrodynamic energy conditions and depositional environments. Sediment samples were collected from three stations representing distinct energy zones along the Anoi Itam coastal transect using a Van Veen grab sampler. Laboratory analysis employed the dry-sieving method, and grain-size fractions were classified following the Wentworth and Folk & Ward scales. The results revealed significant spatial variability among stations, reflecting a clear gradient of hydrodynamic energy. Station 1 was dominated by coarse and very coarse sands, indicating a high-energy nearshore environment. Station 2 exhibited a mixture of coarse and medium sands, representing moderate-energy transitional conditions, while Station 3 consisted mainly of medium to fine sands, typical of low-energy depositional zones. The overall trend shows progressive fining from Station 1 to Station 3, consistent with decreasing flow energy and increasing depositional stability. These findings demonstrate that sediment distribution in the Anoi Itam coastal system is primarily influenced by hydrodynamic sorting, geomorphological features, and sediment transport direction, providing essential baseline data for coastal management and environmental assessment.
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