气候变化领域集成服务门户(CCPortal): Nonlinear trends in signatures characterizing non-perennial US streams

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DOI	10.1016/j.jhydrol.2024.131131
	Nonlinear trends in signatures characterizing non-perennial US streams
	Kar, Kanak Kanti; Roy, Tirthankar; Zipper, Sam; Godsey, Sarah E.
发表日期	2024
ISSN	0022-1694
EISSN	1879-2707
起始页码	635
卷号	635
英文摘要	Stream drying patterns - including duration, timing, and dry-down rates - affect aquatic ecosystems and nutrient exports in non-perennial streams. Because hydrologic processes are often nonlinear, changes in drying may also be nonlinear, but analyses of historical changes in stream drying to date have not characterized the frequency or functional forms of nonlinear change. Understanding the extent of nonlinear change in non-perennial streams is essential for advancing our fundamental knowledge of hydrological processes, aquatic ecosystems, and watershed functioning under a warming climate. This paper uses a polynomial-based trend detection technique (PolyTrend) to analyze the linear and nonlinear trend behaviors of three intermittency signatures (annual no-flow days specifying longer or shorter drying duration, day of first no-flow occurrence specifying timing of stream drying, and days from peak to no-flow specifying dry-down rates) at 540 non-perennial gage stations over 38 years (1980-2017) across the continental United States (CONUS). Additionally, we carried out a breakpoint analysis to characterize the discontinuities in the time series of each intermittency signature. Analysis of annual no-flow days shows that about 37 % of the total streamflow stations are drying for longer each year, whereas about 22 % are wetter for longer than in the past. The day of first no-flow occurrence analysis shows that 10 % of the streams are drying earlier, and 19 % are drying later. On the other hand, analysis of days from peak to no-flow shows that 14 % of streams are drying faster, and 17 % are drying more slowly. For all these metrics, among the significant trends, at least half of the relationships were nonlinear. For annual no-flow days, the breakpoint analysis shows more discontinuities in the second half of the analysis period (1999 to 2017) than in the first half, with more discontinuities in the Southern Great Plains than in other regions. The other two signatures demonstrate less frequent discontinuities in the second half of the analysis period, suggesting decreased nonlinear dynamics in recent years. Nonlinear no-flow duration trends are common in Mediterranean California, and the dry-down rate has increased in recent decades. Our findings indicate that nonlinear change in stream drying is widespread and must be accounted for in watershed planning and management.
英文关键词	Non -perennial stream; Nonlinear trend; Intermittency; Variability; Climate change
语种	英语
WOS研究方向	Engineering ; Geology ; Water Resources
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS记录号	WOS:001229831800001
来源期刊	JOURNAL OF HYDROLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/305376
作者单位	University of Nebraska System; University of Nebraska Lincoln; Idaho; Idaho State University; University of Kansas; University of Kansas
推荐引用方式 GB/T 7714	Kar, Kanak Kanti,Roy, Tirthankar,Zipper, Sam,et al. Nonlinear trends in signatures characterizing non-perennial US streams[J],2024,635.
APA	Kar, Kanak Kanti,Roy, Tirthankar,Zipper, Sam,&Godsey, Sarah E..(2024).Nonlinear trends in signatures characterizing non-perennial US streams.JOURNAL OF HYDROLOGY,635.
MLA	Kar, Kanak Kanti,et al."Nonlinear trends in signatures characterizing non-perennial US streams".JOURNAL OF HYDROLOGY 635(2024).