Đánh giá diễn biến hình thái sông dựa trên sự kết hợp mô hình hóa và phân tích ảnh viễn thám

0 Người đánh giá. Xếp hạng trung bình 0

Tác giả: Trường An Đặng, Văn Hồng Nguyễn

Ngôn ngữ: Vie

Ký hiệu phân loại:

Thông tin xuất bản: Khí tượng thủy văn 2021

Mô tả vật lý: 36-46

Bộ sưu tập: Metadata

ID: 407448

Thêm vào giỏ Liên kết toàn văn

Nghiên cứu được tiến hành nhằm đánh giá xu thế xói, bồi khu vực cửa sông Cổ Chiên giai đoạn 1973-2018. Nghiên cứu được dựa trên sự kết hợp giữa mô hình thủy động lực thuộc họ nhà MIKE được phát triển bởi Viện Thủy Lực Đan Mạch và phân tích ảnh vệ tinh (Google Earth) và ảnh viễn thám (Landsat 7-ETM, Sentinel-2) để xác định xu thế bồi- xói khu vực nghiên cứu. Kết quả cho thấy, khu vực nghiên cứu đã xảy ra xu thế xói lở và bồi tụ đan xen nhau. Cụ thể, bồi tụ đã xảy ra tại một số khu vực như cửa Cung Hầu, cuối cù lao Long Trị, cuối đoạn sông thuộc xã Long Hòa, cồn Nghêu, và cồn Vượt thuộc xã Hiệp Thạnh với tốc độ trung bình khoảng 0,03-0,20 m/năm. Trong khi đó, xói lở cũng được xác định xảy ra tại đoạn đầu cù lao Long Trị thuộc thành phố Trà Vinh, cuối cồn Chim, cồn Phụng, cồn Nghêu và sông Cổ Chiên đoạn qua xã Hòa Minh, Long Hòa thuộc huyện Châu Thành, xã Hiệp Thạnh thuộc thị xã Duyên Hải với tốc độ trung bình khoảng 0,05-0,26 m/năm. Nhìn chung, sự kết hợp giữa mô hình số và ảnh viễn thám góp phần cũng cố mức độ tin cậy của mô hình thủy động lực trong mô phỏng diễn biến hình thái sông., Tóm tắt tiếng anh, The study was conducted to evaluate the erosion and deposition processes in Co Chien estuary area in the period 1973-2018. The study was deployed based on a combination of the hydrodynamic models belongings to the MIKE family which is developed by the Danish Institute of Hydraulics (DHI) and analysis of high-resolution remote sensing images to determine the erosion and deposition processes in the study area. The results showed that the study area has occurred a mixture of erosion and deposition. Specifically, deposition has occurred in some sub-areas such as Cung Hau estuary, the end of Long Tri islet, the end of the river section belongs to Long Hoa commune, Clam islet, and Qua Thu island in Hiep Thanh commune with an average speed of about 0.03-0.20 m/year. Meanwhile, erosion was also identified at the beginnings of Long Tri isle in Tra Vinh City, at the end of Chim islet, Phung islet, Clam islet and Co Chien river section passing Hoa Minh commune, Long Hoa commune of Chau Thanh district, Hiep Thanh commune belongs to Duyen Hai Town with an average speed of about 0.05-0.26 m/year. In general, the combination of hydrodynamic model and remote sensing method contributes to reinforcing the reliability of the hydrodynamic model in the simulation of river morphology variation.

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