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Ngân sách trầm tích vô cơ trong đồng bằng sông Fly có rừng ngập mặn, Papua New Guinea
Tóm tắt
Sáu trạm đo hải dương học đã được duy trì trong 8 tuần tại miệng cửa sông Fly có rừng ngập mặn từ tháng 4 đến tháng 6 năm 1995, trong mùa gió mậu dịch đông nam. Bốn trạm đo bổ sung cũng đã được triển khai trong 8 tuần dọc theo kênh cửa sông vào năm 1992, cũng trong mùa gió mậu dịch đông nam. Dữ liệu này được sử dụng để ước lượng sự trao đổi ròng của trầm tích lơ lửng giữa cửa sông và Vịnh Papua. Phát hiện được một luồng trầm tích mịn đáng kể từ đại dương ven bờ vào cửa sông, khoảng 40 tấn/s, tức là khoảng 10 lần tốc độ dòng chảy từ sông, dẫn đến một tỷ lệ lắng đọng trung bình theo chiều dọc được tính toán là 2 mm/năm. Rừng ngập mặn có thể chiếm khoảng 6% lượng trầm tích từ sông vào hoặc khoảng 1/4 lượng trầm tích đất sét từ sông. Nếu trầm tích này chỉ phân bố trên các khu vực tích lũy quan sát được gần các hòn đảo, thì tỷ lệ tích lũy cục bộ trong các khu vực này có thể đạt tới 4 cm/năm. Các ước tính về tỷ lệ tích lũy khối lượng trầm tích mềm (1–10 kg/m2/năm) trong kênh từ việc đo Pb-210 và C-14 từ các mẫu bùn rừng ngập mặn delta không thể giải thích cho tỷ lệ tích lũy này theo quy mô thời gian từ 100–1000 năm. Số phận của lượng trầm tích còn lại vẫn chưa rõ, nó có thể được xuất khẩu từ cửa sông trong mùa mưa.
Từ khóa
#trầm tích #cửa sông #rừng ngập mặn #đồng bằng #Papua New GuineaTài liệu tham khảo
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