ĐÁNH GIÁ HẠN HÁN TRÊN LƯU VỰC SÔNG VU GIA – THU BỒN BẰNG PHƯƠNG PHÁP VIỄN THÁM

Nguyễn Văn An, Nguyễn Thanh Tưởng, Lê Ngọc Hành, Trần Thị Ân

Tóm tắt


 

Nghiên cứu này được thực hiện nhằm áp dụng các chỉ số viễn thám để theo dõi tình trạng hạn hán ở lưu vực sông Vu Gia – Thu Bồn (VG-TB) bằng cách sử dụng dữ liệu vệ tinh và nền tảng điện toán Google Earth Engine. Dữ liệu viễn thám từ chuỗi vệ tinh Landsat đã chứng tỏ hiệu quả trong việc tính toán các chỉ số hạn hán theo chuỗi thời gian. Cũng trong nghiên cứu này, chúng tôi đã kiểm tra sự hiệu quả của một số chỉ số trong theo dõi hạn hán ở lưu vực sông VG-TB từ 01/2010 đến 12/2020. Kết quả đã cho thấy, khi kiểm tra đối chiếu giữa các chỉ số hạn tại trạm như chỉ số thoát hơi nước tiềm năng, nhiệt độ của bề mặt đất tại trạm khí tượng và các chỉ số hạn hán tính từ dữ liệu vệ tinh có sự tương quan thống nhất tương đối cao. Kết quả này một lần nữa chứng minh dữ liệu viễn thám có thể là một giải pháp thay thế hiệu quả để theo dõi hạn hán khi viễn thám là nguồn dữ liệu khả dụng duy nhất.

 


Từ khóa


hạn hán; Google Earth Engine; Landsat; viễn thám; RSDI; VGTB

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Trích dẫn


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DOI: https://doi.org/10.54607/hcmue.js.20.3.3692(2023)

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