NGHIÊN CỨU ĐÁNH GIÁ CHẤT LƯỢNG DỮ LIỆU MƯA LƯỚI MỘT SỐ TRẬN MƯA LỚN TRÊN KHU VỰC THÀNH PHỐ HÀ TĨNH

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Tác giả: Quang Hưng Nguyễn, Thị Liên Nguyễn, Minh Ngọc Trịnh

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học Biến đổi khí hậu, 2022

Mô tả vật lý: tr.45951

Bộ sưu tập: Báo, Tạp chí

ID: 336858

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Gridded rainfall products which is the production generated by satellite together with weather numerical models combined with ground rain are increasingly developed based on its advantages outstanding ground rainfall measurement. Gridded rainfall products provide spatial information and its interval time is up to 30 minutes, and freely available, that makes it became very high applicability. Although the products are from the same sensors, still the algorithms used for correction, interpolation and matching are different, so there is a huge difference between the products. This study considers rain data from 04 sources including GPM, GSMaP, PERSIANN-CCS and ERA5-Land over Ha Tinh city area to assess their quality and practical applicability. Four rainfall events are used to assess the hourly rainfall compare to the data at rain gauge station in Ha Tinh city. Statistical indicators RMSE, R2, PBIAs, POD, FAR and CSI were used for the evaluation. The results show that in general, all four rain data have good quality, PERSIANN-CCS has the highest correlation with ground-observed rain, the best mean square error index, and other indicators show that GSMaP data is generally the worst quality.Số liệu mưa lưới, sản phẩm ước tính mưa từ vệ tinh kết hợp với giá trị mưa từ mô hình số trị và số liệu mưa thực đo mặt đất đang ngày càng phát triển do khắc phục được nhiều yếu điểm của mưa mặt đất. Mưa lưới có phân giải không gian, thời gian cao, bao phủ nhiều vùng rộng lớn, tần suất lên đến 30 phút một số liệu và phần nhiều cung cấp miễn phí, do đó có tính ứng dụng rất cao. Các sản phẩm mưa lưới dù sử dụng cùng một loại cảm biến, nhưng áp dụng thuật toán khác nhau để xử lý số liệu và hiệu chỉnh với các số liệu đo mưa khác nên có sự khác biệt khá lớn. Nghiên cứu này xem xét dữ liệu mưa giờ từ 04 nguồn gồm mưa GPM, GSMaP, PERSIANN-CCS và ERA5-Land cung cấp cho khu vực thành phố Hà Tĩnh để đánh giá chất lượng và khả năng ứng dụng thực tế. Bốn trận mưa được sử dụng để đánh giá với mưa giờ thực đo tại trạm khí tượng Hà Tĩnh. Các chỉ số thống kê RMSE, R2, PBIAs, POD, FAR và CSI được sử dụng để đánh giá so sánh. Kết quả cho thấy nhìn chung cả 4 dữ liệu mưa đều có chất lượng tốt, PERSIANN-CCS có tương quan cao nhất với mưa quan trắc mặt đất, chỉ số sai số quân phương trung bình tốt nhất, trong khi đó các chỉ số khác đều chỉ ra dữ liệu GSMaP kém chất lượng nhất trong 4 nguồn dữ liệu.

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