Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017WR020376 |
Nonstationarity in threshold response of stormflow in southern Appalachian headwater catchments | |
Scaife, Charles I.1,2; Band, Lawrence E.1,2 | |
2017-08-01 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:8 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Threshold behavior of stormflow response is an emergent pattern observed in several studies demonstrating subsurface storage controls on catchment rainfall-runoff dynamics. These studies demonstrate a distinct transition from negligible stormflow discharge response to rapid, linearly increasing stormflow identified by a single, uniquely defined threshold as a basic catchment attribute that relates to geophysical properties. Utilizing precipitation, streamflow, and soil moisture data spanning 15 years from three catchments at the Coweeta Hydrologic Laboratory (CHL), we analyze how threshold behavior forms and varies at several timescales. We pose three hypotheses: (1) stormflow thresholds form at CHL as a function of antecedent soil moisture and gross precipitation, (2) thresholds vary seasonally and interannually, and (3) threshold variation through time implies greater long-term complexity of runoff controls beyond catchment geophysical properties, including forest canopy ecohydrologic feedbacks. We isolate threshold behavior of stormflow using piecewise regression analysis in short to long-term data sets with respect to antecedent soil moisture index and gross precipitation. We use this to investigate threshold variation over seasonal, interannual, and decadal timescales that encompass hydroclimatic extremes. Seasonal analysis reveals that thresholds are more variable between growing seasons than between dormant seasons. In growing seasons with greater water stress, stormflow thresholds are lower after controlling for soil moisture storage suggesting more complex, long-term rainfall-runoff relationships as a result of forest canopy response to water stress. We present a conceptual model of how vegetation-climate interactions influence long-term rainfall-runoff relationships creating interannual variability of stormflow thresholds and linear stormflow response. |
英文关键词 | threshold response nonstationarity stormflow generation long-term analysis hydroclimate variability |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000411202000014 |
WOS关键词 | SOIL-MOISTURE PATTERNS ; RUNOFF RESPONSE ; CLIMATE-CHANGE ; WATER-BALANCE ; HYDROCLIMATE VARIABILITY ; COMPLEX TERRAIN ; FOREST ; HILLSLOPE ; VEGETATION ; RAINFALL |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/21460 |
专题 | 资源环境科学 |
作者单位 | 1.Univ N Carolina, Dept Geog, Chapel Hill, NC 27599 USA; 2.Univ N Carolina, Inst Environm, Chapel Hill, NC 27599 USA |
推荐引用方式 GB/T 7714 | Scaife, Charles I.,Band, Lawrence E.. Nonstationarity in threshold response of stormflow in southern Appalachian headwater catchments[J]. WATER RESOURCES RESEARCH,2017,53(8). |
APA | Scaife, Charles I.,&Band, Lawrence E..(2017).Nonstationarity in threshold response of stormflow in southern Appalachian headwater catchments.WATER RESOURCES RESEARCH,53(8). |
MLA | Scaife, Charles I.,et al."Nonstationarity in threshold response of stormflow in southern Appalachian headwater catchments".WATER RESOURCES RESEARCH 53.8(2017). |
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