Spatiotemporal Characteristics of Dry-Wet Abrupt Transition Based on Precipitation in Poyang Lake Basin, China

Water

Xianghu Li¹  Xuchun Ye² 

[1] Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing 210008, China;School of Geographical Sciences, Southwest University, 2 Tiansheng Road, Chongqing 400715, China; E-Mail:

关键词: dry-wet abrupt transition;    precipitation;    spatiotemporal distribution;    Poyang Lake basin;   

DOI  :  10.3390/w7051943

来源: mdpi

【 摘 要 】

The dry-wet abrupt transition (DWAT) is a typical anomaly of precipitation at the subseasonal scale and may result in a severer and greater hydro-meteorological hazard. This paper identified and examined the DWAT events in terms of precipitation in Poyang Lake basin, including both from dry to wet (DTW) and from wet to dry (WTD), during the period of 1960–2010 and analyzed its characteristics of temporal and spatial distribution and intra- and inter-annual tendencies based on the Mann–Kendall (M–K) test. The results revealed that the DTW was inclined to occur in March, but WTD in July and September; the inter-annual variation of the DWAT index showed a feeble long-term increasing trend in July and a decreasing trend in September with a Z-statistic of 1.81 and −1.44, respectively, although none of these trends achieved the statistical significance level (α = 0.05); the north parts of Poyang Lake basin experienced more DWAT events during the last 50 years in which the occurrence of WTD is more frequent than that of DTW. The outcomes of the study will help mitigate and regulate the flood and drought in Poyang Lake basin, as well as in other regions.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.