{
    "tag": 20198,
    "title": "Oceanographic time-series monitoring data of a shallow-water placement of dredged sediment in south San Francisco Bay, California, 2023-2025",
    "pubdate": "20250820",
    "sername": null,
    "series_name": null,
    "issue": "DOI:10.5066\/P14D723N",
    "publish": null,
    "publisher_name": null,
    "onlink": "https:\/\/cmgds.marine.usgs.gov\/catalog\/pcmsc\/DataReleases\/CMGDS_DR_tool\/DR_P14D723N\/DMP23_timeseries_metadata.faq.html",
    "format": null,
    "email": null,
    "descript": "Oceanographic and meteorological time-series monitoring data were collected by the U.S. Geological Survey (USGS) Pacific Coastal and Marine Science Center from 2023 to 2025, to monitor a pilot shallow-water placement of dredged sediment project led by the US Army Corps of Engineers San Francisco District. Data were collected at nine stations located in the shallows offshore of Whales Tail Marsh in south San Francisco Bay, CA. Stations were positioned around the placement site of the dredged material. Data were collected prior to, during, and after the sediment was placed. Stations consisted of platforms deployed along 2 transects: one along-shore and one cross-shore. Stations in the cross-shore transect included: XM, located approximately 25 meters from the bay edge on Whales Tail marsh; X4 located slightly offshore of the marsh; X3 just offshore (west) of X4; X2 (same location as XG and XL) east\/marsh side of the placement area; X1 western side of the placement area; and X0 just east of the navigational channel. A wave-met buoy MW was close to and slightly east of X0. Along-shore transect platforms included AN and AS, north and south of the placement area, respectively. Data types include pressure, velocity, turbidity, suspended particle size distribution, conductivity, temperature, wave statistics, and wind speed and direction, barometric pressure and air temperature. Data files are grouped by deployment (A-E) then by station name (OR) instrument type, except for data recorded at station X0 and MW, which have their own folders. At several stations there were periods of low water when sensors were no longer submerged, resulting in spurious data. In addition, most instruments experienced some degree of biofouling. Users are advised to assess data quality carefully, and to check the metadata for instrument information, as platform deployment times and data-processing methods varied. Turbidity values (in NTU or volts) can be converted to SSC (in milligrams per liter) via the calibration coefficient (slope value) located in the \u201cSupport Files\u201d section below, DMP_Turbidity_to_SSC_calibration_constants.csv. Turbidity data were recorded using either a 1x gain or a 5x gain setting however, all calibration coefficients were obtained using 5x gain data. Therefore, users should refer to the \u201cDeployment Gain Setting\u201d column in the support file to determine the gain setting of the data in use. Data collected at 1x gain must be scaled to 5x gain before comparison with other 5x datasets or conversion to SSC. To convert a sensor from 1x gain to 5x gain, simply multiply the turbidity data by 5. To convert a 1x gain data to SSC, use the following equation: (SSC = 5 * turbidity data * slope), where slope is calibration coefficient obtained from the support file. To convert a sensor that was deployed using a 5x gain setting to SSC, simply multiply the turbidity data by the appropriate slope value from the support file.",
    "lang": null,
    "journal": null,
    "pwid": null,
    "originator": [
        {
            "name": "McGill, Samantha C.",
            "role": "Author"
        },
        {
            "name": "Allen, Rachel M.",
            "role": "Author"
        },
        {
            "name": "Thede, Joanne C.",
            "role": "Author"
        },
        {
            "name": "Stevens, Andrew W.",
            "role": "Author"
        },
        {
            "name": "Dartnell, Peter",
            "role": "Author"
        },
        {
            "name": "Lacy, Jessica R.",
            "role": "Author"
        },
        {
            "name": "Tan, Angela C.",
            "role": "Author"
        },
        {
            "name": "Hatcher, Gerald A.",
            "role": "Author"
        }
    ],
    "index_term": [
        {
            "thcode": 2,
            "code": "222",
            "name": "CTD measurement",
            "scope": "Instrumental determination of conductivity, temperature, and pressure as a function of depth to determine the salinity of seawater."
        },
        {
            "thcode": 2,
            "code": "708",
            "name": "marine water quality",
            "scope": "Observed intrinsic characteristics of marine waters affecting their ability to support life or facilitate biological processes such as waste decomposition."
        },
        {
            "thcode": 2,
            "code": "1129",
            "name": "suspended material (water)",
            "scope": "Sediment or organic material carried in suspension in the water column, in contrast to material that moves on or near the bottom. May be measured directly by sampling, or indirectly by acoustic or optical backscatter or transmission."
        },
        {
            "thcode": 2,
            "code": "1172",
            "name": "time series datasets",
            "scope": "Digital information describing observations taken at specified time intervals.  The time interval may be regular or variable; the type of observed phenomena and the location are typically constant."
        },
        {
            "thcode": 15,
            "code": "014",
            "name": "oceans",
            "scope": "Features and characteristics of salt water bodies (excluding inland waters), for example tides, tidal waves, coastal information, reefs, maritime, outer continental shelf submerged lands, shoreline"
        },
        {
            "thcode": 23,
            "code": "25",
            "name": "Water-Quality Parameters",
            "scope": "Includes measures of the ranges and distributions of the chemical, physical, and biological constituents of waters, including temperature, salinity, pH, dissolved oxygen, turbidity, total suspended solids, chlorophyll, nutrients, bacteria, and toxicants. Distributions are recorded observations as a function of time and place, including measures of one or more parameters; maps that use observations and consider hydrodynamic factors to estimate present distributions or ranges; or categorizations of areas using classification systems such as CMECS to identify ranges. Assessments evaluate the current ecological, human health, or economic effects, values, or harms linked to water-quality parameters as well as evaluating effects on ecosystems, biotic distributions, and ecological processes. In the case of temperature, this includes ecological, industrial, and human service values but does not include values related to energy production, which are covered in the Energy Resources category. Predictions are the results of models or projections of future distributions, values, and human health or ecological impacts of water-quality parameters; Predictions include predicted effects due to changes in climate, industrial or residential needs, land use, or other natural and human forces and include scenario-based models of the impacts of changes to parameters on ecological, human health, or economic values under different management strategies or other human alterations."
        },
        {
            "thcode": 61,
            "code": "400",
            "name": "field observation",
            "scope": "scientific investigation of physical or biological features and processes in a natural setting."
        },
        {
            "thcode": 61,
            "code": "754",
            "name": "physical oceanography",
            "scope": "the study of physical conditions and processes in the oceans."
        },
        {
            "thcode": 61,
            "code": "173",
            "name": "seabed",
            "scope": "the floor of a sea or ocean."
        },
        {
            "thcode": 61,
            "code": "443",
            "name": "water level measurements",
            "scope": "used for measurements related to long-term events (e.g., sea-level rise) or transient events (e.g., tides or storm surge)."
        },
        {
            "thcode": 61,
            "code": "444",
            "name": "wave observations",
            "scope": "used for quantitative or qualitative wave observations of any type."
        }
    ],
    "place_term": [],
    "image": [],
    "fan": [
        "2023-655-FA"
    ]
}