Item talk:Q307016

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   "@type": "Article",
   "additionalType": "Journal Article",
   "name": "Seasonal, spring-neap, and tidal variation in cohesive sediment transport parameters in estuarine shallows",
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       "value": "10.1029/2018JC014825",
       "url": "https://doi.org/10.1029/2018JC014825"
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   "journal": {
     "@type": "Periodical",
     "name": "Journal of Geophysical Research: Oceans",
     "volumeNumber": "124",
     "issueNumber": "11"
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   "inLanguage": "en",
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       "name": "Journal of Geophysical Research: Oceans"
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   "datePublished": "2019",
   "dateModified": "2020-01-03",
   "abstract": "Numerical models for predicting sediment concentrations and transport rely on parameters such as settling velocity and bed erodibility that describe sediment characteristics, yet these parameters are rarely probed directly. We investigated temporal and spatial variation in sediment parameters in the shallows of San Pablo Bay, CA. Flow, turbulence, and suspended sediment data were measured at sites located at 1 and 2\u00a0m below mean lower low water (MLLW) from November 2013 through April 2015, supplemented by monthlong periods in 2011, 2012, and 2016. Maximum current velocities were 0.40\u20130.47\u00a0m s-1\u00a0at these depths; the strongest currents decreased to 0.27\u20130.34\u00a0m s-1\u00a0during neap periods. Winters 2013\u20132014 and 2014\u20132015 experienced strong drought conditions, limiting the potential for seasonal impact on sediment conditions during this experiment. Despite this, the more storm\u2010influenced site showed clear changes during the winter: the roughness parameter decreased from 10\u22124\u00a0to 10\u22125\u00a0m, from hydrodynamically rough to smooth conditions, and bed erodibility increased by an order of magnitude. Median settling velocity was 2.05\u00b710\u22124\u00a0m s-1; it varied twofold within a tidal cycle, decreasing as current velocity grew during flood and ebb. This tidal control on floc size affected settling velocity on the spring\u2010neap timescale, possibly driving a spring\u2010neap oscillation in erodibility. Our findings highlight variation in sediment dynamics that is commonly ignored in numerical models and the need for field observations to ground truth ongoing modeling efforts.",
   "description": "20 p.",
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     "name": "Wiley"
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       "name": "Allen, Rachel",
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           "name": "Pacific Coastal and Marine Science Center",
           "url": "https://www.usgs.gov/centers/pacific-coastal-and-marine-science-center"
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       "name": "Lacy, Jessica R.",
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           "name": "University of California, Berkeley"
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       "name": "Mark T. Stacey",
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