气候变化领域集成服务门户(CCPortal): Technical note: Long-term persistence loss of urban streams as a metric for catchment classification

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DOI	10.5194/hess-22-3551-2018
	Technical note: Long-term persistence loss of urban streams as a metric for catchment classification
	Jovanovic D.; Jovanovic T.; Mejía A.; Hathaway J.; Daly E.
发表日期	2018
ISSN	1027-5606
起始页码	3551
结束页码	3559
卷号	22 期号:6
英文摘要	Urbanisation has been associated with a reduction in the long-term correlation within a streamflow series, quantified by the Hurst exponent (H). This presents an opportunity to use the H exponent as an index for the classification of catchments on a scale from natural to urbanised conditions. However, before using the H exponent as a general index, the relationship between this exponent and level of urbanisation needs to be further examined and verified on catchments with different levels of imperviousness and from different climatic regions. In this study, the H exponent is estimated for 38 (deseasonalised) mean daily runoff time series, 22 from the USA and 16 from Australia, using the traditional rescaled-range statistic (R/S) and the more advanced multifractal detrended fluctuation analysis (MF-DFA). Relationships between H and catchment imperviousness, catchment size, annual rainfall and specific mean discharge were investigated. No clear relationship with catchment area was found, and a weak negative relationship with annual rainfall and specific mean streamflow was found only when the R/S method was used. Conversely, both methods showed decreasing values of H as catchment imperviousness increased. The H exponent decreased from around 1.0 for catchments in natural conditions to around 0.6 for highly urbanised catchments. Three significantly different ranges of H exponents were identified, allowing catchments to be parsed into groups with imperviousness lower than 5 % (natural), catchments with imperviousness between 5 and 15 % (peri-urban) and catchments with imperviousness larger than 15 % (urban). The H exponent thus represents a useful metric to quantitatively assess the impact of catchment imperviousness on streamflow regime. © The Author(s) 2018.
语种	英语
scopus关键词	Fractals; Rain; Runoff; Stream flow; Time series analysis; Catchment classifications; Climatic regions; Long-term correlations; Multifractal detrended fluctuation analysis; Natural conditions; Range statistics; Streamflow regimes; Urbanised catchments; Catchments; catchment; peak discharge; persistence; rainfall; runoff; streamflow; urban area; Australia; United States
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159993
作者单位	Jovanovic, D., Department of Civil Engineering, Monash University, Melbourne, VIC 3800, Australia; Jovanovic, T., Department of Civil and Environmental Engineering, Pennsylvania State University, University Park, PA 16802, United States, National Socio-Environmental Synthesis Center (SESYNC), University of Maryland, Annapolis, MD, United States; Mejía, A., Department of Civil and Environmental Engineering, Pennsylvania State University, University Park, PA 16802, United States; Hathaway, J., Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, TN 37996, United States; Daly, E., Department of Civil Engineering, Monash University, Melbourne, VIC 3800, Australia
推荐引用方式 GB/T 7714	Jovanovic D.,Jovanovic T.,Mejía A.,et al. Technical note: Long-term persistence loss of urban streams as a metric for catchment classification[J],2018,22(6).
APA	Jovanovic D.,Jovanovic T.,Mejía A.,Hathaway J.,&Daly E..(2018).Technical note: Long-term persistence loss of urban streams as a metric for catchment classification.Hydrology and Earth System Sciences,22(6).
MLA	Jovanovic D.,et al."Technical note: Long-term persistence loss of urban streams as a metric for catchment classification".Hydrology and Earth System Sciences 22.6(2018).