Nghiên cứu đánh giá xu hướng biến động lượng mưa lớn nhất theo các thời đoạn khác nhau giai đoạn 1975-2021, tỉnh Vĩnh Phúc

Abstract

This study illustrates the results of assessing the variable trend of the largest 1, 3, 5 and 7-day rainfall in the period 1975-2021 for Vinh Phuc province using the non-parametric Mann-Kendall test. The results show that (i) the maximum 1-day rainfall decreased from -0.17 to -1.01 mm/year (at Quang Cu, Tam Dao, Tam Duong and Vinh Tuong) and increased from 0.18 to 2 .64 mm/year (at Binh Xuyen, Phuc Yen, Vinh Yen and Xuan Hoa), (ii) the maximum 3-day rainfall reduced from -0.41 to -1.02 mm/year (at Quang Cu, Tam Dao and Tam Duong) and rose from 0.04 to 4.06 mm/year (at Binh Xuyen, Phuc Yen, Vinh Tuong, Vinh Yen and Xuan Hoa), (iii) the maximum 5-day rainfall grew from 0.13 to 3.90 mm/year (at Binh Xuyen, Phuc Yen, Vinh Tuong and Xuan Hoa) and dropped from -0.37 to -0.99 mm/year (at Quang Cu, Tam Dao, Tam Duong and Vinh Yen), (iv) the maximum 7-day rainfall increased from 0.03 to 5.34 mm/year (at Binh Xuyen, Phuc Yen, Quang Cu, Tam Dao and Xuan Hoa) and declined from -0.08 to -0.46 mm/year (at Tam Duong, Vinh Tuong and Vinh Yen).