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ojs2 has produced an error Message: WARNING: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. In file: /home/vjs/vjs2483/lib/pkp/classes/core/Core.inc.php At line: 95 Stacktrace: Server info: OS: Linux PHP Version: 5.6.40 Apache Version: Apache/2.4.6 (CentOS) DB Driver: mysql DB server version: 5.5.68-MariaDB
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ojs2 has produced an error Message: WARNING: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. In file: /home/vjs/vjs2483/plugins/generic/usageStats/UsageStatsPlugin.inc.php At line: 345 Stacktrace: Server info: OS: Linux PHP Version: 5.6.40 Apache Version: Apache/2.4.6 (CentOS) DB Driver: mysql DB server version: 5.5.68-MariaDB
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LẮNG ĐỌNG TRẦM TÍCH TRÊN BÃI TRIỀU BÀNG LA VÀ NGỌC HẢI, HẢI PHÒNG | Nhơn | Vietnam Journal of Marine Science and Technology ojs2 has produced an error Message: WARNING: strtotime(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. In file: /home/vjs/vjs2483/cache/t_compile/%%31^31B^31BC1435%%googlescholar.tpl.php At line: 35 Stacktrace: Server info: OS: Linux PHP Version: 5.6.40 Apache Version: Apache/2.4.6 (CentOS) DB Driver: mysql DB server version: 5.5.68-MariaDB
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LẮNG ĐỌNG TRẦM TÍCH TRÊN BÃI TRIỀU BÀNG LA VÀ NGỌC HẢI, HẢI PHÒNG

Đặng Hoài Nhơn, Hoàng Thị Chiến, Nguyễn Thị Kim Anh, Bùi Văn Vượng, Nguyễn Ngọc Anh, Phạm Hải An, Vũ Mạnh Hùng, Phan Sơn Hải

Abstract


Lắng đọng trầm tích trên bãi triều Bàng La - Ngọc Hải, Hải Phòng đã được nghiên cứu bằng bẫy và lỗ khoan trầm tích.  Bẫy trầm tích được nghiên cứu trong 2 mùa trong các năm 2008 và 2009, tuổi lỗ khoan trầm tích được xác định bằng 210Pb sử dụng mô hình CRS  để tính.

Trầm tích lắng đọng và tầng mặt trên bãi triều là các trầm tích có kích thước hạt nhỏ, gồm 3 loại trầm tích là bột lớn (Md = 0,057 - 0,087 mm), bùn bột nhỏ (Md =  0,010 - 0,025 mm), bùn sét bột (Md = 0,008 - 0,009 mm).

Bãi triều Bàng La có tốc độ tích tụ khối lượng trầm tích về mùa khô dao động trong khoảng 1,34 - 6,98 g/cm2/năm, về mùa mưa trong khoảng 0,07 - 13,76 g/cm2/năm. Bãi triều Ngọc Hải  có tốc độ tích tụ khối lượng trầm tích về mùa khô dao động trong khoảng 1,82 - 6,84 g/cm2/năm, về mùa mưa trong khoảng 8,55 - 22,81 g/cm2/năm.

Tốc độ bồi tụ nổi cao ở bãi triều Bàng La dao động trong khoảng 0,13 - 1,18 cm/năm trong giai đoạn 1894 - 2008, tốc độ bồi tụ nổi cao ở bãi triều Ngọc Hải dao động trong khoảng 0,26 - 15,00 cm/năm trong giai đoạn 1935 - 2008.

Lắng đọng trầm tích trên bãi triều chịu ảnh hưởng rất lớn của thảm thực vật ngập mặn và vị trí của địa hình. Kết quả đo được cho thấy tốc độ tích tụ khối lượng trầm tích lớn nhất gặp trong rừng ngập mặn, bên ngoài rừng ngập mặn có tốc độ tích tụ khối lượng trầm tích nhỏ hơn.

Từ khóa: 210Pb, lắng đọng trầm tích, bãi triều, Bàng La, Ngọc Hải.


Full Text:

PDF


DOI: https://doi.org/10.15625/1859-3097/11/1/362


Editorial Office:

Vietnam Journal of Marine Science and Technology

1st Floor, A16 Building, 18 Hoang Quoc Viet Street, Cau Giay District, Hanoi, Vietnam

Tel: (+84) 024 3791 7411

E-mail: jmst@vjs.ac.vn