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Nồng độ trầm tích lơ lửng trong vùng gần bờ và mô hình vận chuyển dọc bờ biển phía nam Karnataka, Ấn Độ
Tóm tắt
Sự biến đổi của nồng độ trầm tích lơ lửng (SSC) gần bờ là rất quan trọng để hiểu rõ về sự tuần hoàn và vận chuyển trầm tích trong và xung quanh khu vực ven biển. SSC được thu thập từ đường bờ cho đến độ sâu 20 m theo 13 điểm xuyên suốt được chọn giữa Malpe và Talapady dọc theo bờ biển phía nam Karnataka, Ấn Độ. Dữ liệu của Bộ theo dõi màu đại dương (OCM) và SSC lấy mẫu tại chỗ đã được so sánh để xác thực dữ liệu vệ tinh. Nồng độ SSC cao ở phía nam khu vực nghiên cứu là do hoạt động sóng mạnh, xói mòn bờ biển, dòng chảy trầm tích từ các con sông, hoạt động nạo vét của Cảng New Mangalore và xây dựng rạn san hô ngoài khơi tại Ullal. Các mẫu lấy tại chỗ cho thấy nồng độ SSC cao tại lớp nước đáy trong các cửa sông, điều này cho thấy sự ưu thế của vận chuyển trầm tích đáy so với trầm tích lơ lửng. Trong vùng nước gần bờ, nồng độ cao ở bề mặt, giữa và đáy nước được ghi nhận dọc theo các trạm bị ảnh hưởng bởi các hoạt động nhân tạo. Dữ liệu tại chỗ dường như tương quan tích cực (± 10 mg/l) với dữ liệu OCM. Các giá trị SSC được giải mã bằng thuật toán Tassan sửa đổi cung cấp các ước lượng chính xác trong vùng nước ven biển phía tây nam Ấn Độ. Mô hình vận chuyển trầm tích được rút ra từ các thông số thống kê của mẫu trầm tích đáy cho thấy hướng vận chuyển ra khơi, về phía nam và về phía bắc. Các cấu trúc tự nhiên và nhân tạo hoạt động như là một rào cản trong việc vận chuyển trầm tích ven biển. Hướng vận chuyển trầm tích trong các vùng nước ven biển có ích cho việc duy trì các kênh hàng hải và lập kế hoạch cho các cấu trúc ven biển trong khu vực ven bờ.
Từ khóa
#trầm tích lơ lửng #vùng gần bờ #Karnataka #vận chuyển trầm tích #dữ liệu vệ tinhTài liệu tham khảo
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