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Sudden Clearing of Estuarine Waters upon Crossing the Threshold from Transport to Supply Regulation of Sediment Transport as an Erodible Sediment Pool is Depleted: San Francisco Bay, 1999

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Abstract

The quantity of suspended sediment in an estuary is regulated either by transport, where energy or time needed to suspend sediment is limiting, or by supply, where the quantity of erodible sediment is limiting. This paper presents a hypothesis that suspended-sediment concentration (SSC) in estuaries can suddenly decrease when the threshold from transport to supply regulation is crossed as an erodible sediment pool is depleted. This study was motivated by a statistically significant 36% step decrease in SSC in San Francisco Bay from water years 1991–1998 to 1999–2007. A quantitative conceptual model of an estuary with an erodible sediment pool and transport or supply regulation of sediment transport is developed. Model results confirm that, if the regulation threshold was crossed in 1999, SSC would decrease rapidly after water year 1999 as observed. Estuaries with a similar history of a depositional sediment pulse followed by erosion may experience sudden clearing.

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Acknowledgments

I would like to thank those that have helped collect, process, and publish the continuous SSC data: Rick Adorador, Greg Brewster, Paul Buchanan, Laurie Campbell, Mike Farber, Amber Forest, Neil Ganju, Tom Hankins, Megan Lionberger, Allan Mlodnosky, Tara Morgan, Heather Ramil, Cathy Ruhl, Rob Sheipline, Brad Sullivan, and Jessica Wood. Bruce Jaffe, Neil Ganju, John Oram, and two anonymous reviewers provided helpful comments on earlier versions of this article. This work was supported by the US Army Corps of Engineers, San Francisco District, as part of the Regional Monitoring Program for Water Quality in the San Francisco Estuary.

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Correspondence to David H. Schoellhamer.

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Schoellhamer, D.H. Sudden Clearing of Estuarine Waters upon Crossing the Threshold from Transport to Supply Regulation of Sediment Transport as an Erodible Sediment Pool is Depleted: San Francisco Bay, 1999. Estuaries and Coasts 34, 885–899 (2011). https://doi.org/10.1007/s12237-011-9382-x

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  • DOI: https://doi.org/10.1007/s12237-011-9382-x

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