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Journal article
Estuarine abandoned channel sedimentation rates record peak fluvial discharge magnitudes
Estuarine, coastal and shelf science, v 203
05 Apr 2018
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Abstract
Fluvial sediment deposits can provide useful records of integrated watershed expressions including flood event magnitudes. However, floodplain and estuarine sediment deposits evolve through the interaction of watershed/marine sediment supply and transport characteristics with the local depositional environment. Thus extraction of watershed scale signals depends upon accounting for local scale effects on sediment deposition rates and character. This study presents an examination of the balance of fluvial sediment dynamics and local scale hydro-geomorphic controls on alluviation of an abandoned channel in the Salinas River Lagoon, CA. A set of three sediment cores contained discrete flood deposits that corresponded to the largest flood events over the period of accretion from 1969 to 2007. Sedimentation rates scaled with peak flood discharge and event scale sediment flux, but were not influenced by longer scale hydro-meteorological activities such as annual precipitation and water yield. Furthermore, the particle size distributions of flood deposits showed no relationship to event magnitudes. Both the responsiveness of sedimentation and unresponsiveness of particle size distributions to hydro-sedimentological event magnitudes appear to be controlled by aspects of local geomorphology that influence the connectivity of the abandoned channel to the Salinas River mainstem. Well-developed upstream plug bar formation precluded the entrainment of coarser bedload into the abandoned channel, while Salinas River mouth conditions (open/closed) in conjunction with tidal and storm surge conditions may play a role in influencing the delivery of coarser suspended load fractions. Channel adjacent sediment deposition can be valuable records of hydro-meteorological and sedimentological regimes, but local depositional settings may dominate the character of short term (interdecadal) signatures. (C) 2018 Published by Elsevier Ltd.
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Details
- Title
- Estuarine abandoned channel sedimentation rates record peak fluvial discharge magnitudes
- Creators
- A. B. Gray - University of California, RiversideG. B. Pasternack - University of California, DavisE. B. Watson - Academy of Natural Sciences of Drexel University
- Publication Details
- Estuarine, coastal and shelf science, v 203
- Publisher
- Elsevier
- Number of pages
- 10
- Grant note
- Ernest E. Hill Fellowship William and Linda Sullivan Scholarship CA-D-LAW 7034-H; CA-R-ENS-5120-H / USDA National Institute of Food and Agriculture, Hatch program 0628385 / National Science Foundation; National Science Foundation (NSF) Hydrologic Sciences Graduate Group at the University of California, Davis
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Biodiversity, Earth, and Environmental Science (BEES)
- Web of Science ID
- WOS:000428497400008
- Scopus ID
- 2-s2.0-85044638770
- Other Identifier
- 991019182654704721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Marine & Freshwater Biology
- Oceanography