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Journal article
The effect of El Nino Southern Oscillation cycles on the decadal scale suspended sediment behavior of a coastal dry-summer subtropical catchment
Earth surface processes and landforms, v 40(2), pp 272-284
01 Feb 2015
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Abstract
Rivers display temporal dependence in suspended sediment-water discharge relationships. Although most work has focused on multi-decadal trends, river sediment behavior often displays sub-decadal scale fluctuations that have received little attention. The objectives of this study were to identify inter-annual to decadal scale fluctuations in the suspended sediment-discharge relationship of a dry-summer subtropical river, infer the mechanisms behind these fluctuations, and examine the role of El Nino Southern Oscillation climate cycles. The Salinas River (California) is a moderate sized (11 000km(2)), coastal dry-summer subtropical catchment with a mean discharge (Q(mean)) of 11.6m(3)s(-1). This watershed is located at the northern most extent of the Pacific coastal North America region that experiences increased storm frequency during El Nino years. Event to inter-annual scale suspended sediment behavior in this system was known to be influenced by antecedent hydrologic conditions, whereby previous hydrologic activity regulates the suspended sediment concentration-water discharge relationship. Fine and sand suspended sediment in the lower Salinas River exhibited persistent, decadal scale periods of positive and negative discharge corrected concentrations. The decadal scale variability in suspended sediment behavior was influenced by inter-annual to decadal scale fluctuations in hydrologic characteristics, including: elapsed time since small (0.1xQ(mean)), and moderate (10xQ(mean)) threshold discharge values, the number of preceding days that low/no flow occurred, and annual water yield. El Nino climatic activity was found to have little effect on decadal-scale fluctuations in the fine suspended sediment-discharge relationship due to low or no effect on the frequency of moderate to low discharge magnitudes, annual precipitation, and water yield. However, sand concentrations generally increased in El Nino years due to the increased frequency of moderate to high magnitude discharge events, which generally increase sand supply. Copyright (c) 2014 John Wiley & Sons, Ltd.
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Details
- Title
- The effect of El Nino Southern Oscillation cycles on the decadal scale suspended sediment behavior of a coastal dry-summer subtropical catchment
- Creators
- Andrew B. Gray - University of California, DavisGregory B. Pasternack - University of California, DavisElizabeth B. Watson - Environmental Protection AgencyJonathan A. Warrick - Pacific Science CenterMiguel A. Goni - Oregon State University
- Publication Details
- Earth surface processes and landforms, v 40(2), pp 272-284
- Publisher
- Wiley
- Number of pages
- 13
- Grant note
- 0628385 / National Science Foundation; National Science Foundation (NSF) CA-D-LAW-7034-H / USDA National Institute of Food and Agriculture; United States Department of Agriculture (USDA) Hydrologic Sciences Graduate Group at the University of California at Davis
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Biodiversity, Earth, and Environmental Science (BEES)
- Web of Science ID
- WOS:000348902200009
- Scopus ID
- 2-s2.0-84921532115
- Other Identifier
- 991019298718304721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Geography, Physical
- Geosciences, Multidisciplinary