Mô hình vận chuyển trầm tích vùng ven biển Sóc Trăng bằng phương pháp phân tích xu hướng cấp hạt

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Tác giả: Quang Trung han, Minh Đạo Nguyễn, Thị Hương Lan Nguyễn, Thị Mộng Thắm Võ

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Khoa học Kỹ thuật Thủy lợi và Môi trường, 2023

Mô tả vật lý: tr.43

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ID: 338266

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Phân tích xu hướng và phân bố thành phần cấp hạt đã được nghiên cứu và ứng dụng thành công trong các môi trường trầm tích ven biển khác nhau để xác định xu hướng vận chuyển của trầm tích trong các vùng nghiên cứu. Trong nghiên cứu này, 169 mẫu trầm tích bề mặt ven biển tỉnh Sóc Trăng đã được thu thập bằng thiết bị lấy mẫu trầm tích chuyên dụng và phân tích để hiểu rõ hơn về phân bố trầm tích khu vực này. Các mẫu trầm tích được phân tích thành phần cấp hạt bằng phương pháp nhiễu xạ Laser. Kết quả phân tích thành phần cấp hạt của nghiên cứu này cho thấy rằng, tỷ lệ thành phần cát trong mẫu chiếm 43,98% và bùn sét chiếm 56,02%. Trong thành phần cát, cát mịn chiếm 52% (0,125 – 0,25nm), cát rất mịn chiếm 48% (0,063 – 0,125 nm), và cấp hạt trung bình toàn bộ mẫu là 4,61(Φ). Kết quả phân tích xu hướng vận chuyển trầm tích trong vùng cho thấy, trầm tích vùng ven biển khu vực nghiên cứu chủ yếu có xu hướng vận chuyển dọc theo ven bờ về phía Nam. Tuy nhiên cũng có một những vùng xu hướng vận chuyển trầm tích không rõ ràng.The distribution of sediments in the coastal and estuary region is quite complicated. The sediments in these areas are influenced by many natural factors such as tidal regimes, inshore currents as well as pathways of sediment transport from the rivers. Spatial variation of particle size parameters may reflect sediment transport patterns and sedimentation dynamics environments. In this study, 169 samples of coastal surface sediments in Soc Trang province were collected using a specialized sediment grab and analyzed to evaluate the sediment distribution in this area. These samples were analyzed by the Laser diffraction analysis on Horiba LA-960V2. The proportion of sand and alluvium in the samples is 43.98% and 56.02%, respectively. In the sand composition, small sand accounted for 52% (0.125 - 0.25 nm), very small sand accounted for 48% (0.063 - 0.125 nm), and the average grain grade of the whole sample is 4.61(Φ). The fine-grained components are mainly concentrated along the coast and gradually coarser towards the sea. It shows that the coastal currents dominate and affect the coastal sediments in the study area

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