{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Gabrielle A Edens", "hasEmail": "mailto:gedens@usgs.gov"}, "description": "This data release contains results from 2019-2023 for bed material and suspended sediment samples collected at USGS 07374525 Mississippi River at Belle Chasse gage in association with the Louisiana Coastal Protection and Restoration Authority, Lowermost Mississippi River Management Program. Concentration, percent fines and grain size analysis on bed material and suspended sediment samples were processed following the guidelines outlined in \u201cLaboratory Theory and Methods for Sediment Analysis\u201d (Guy, 1969). Particle size distribution was conducted on depth integrated and point suspended sediment samples on the sands and fines fractions and were processed using laser diffraction with the Beckman Coulter LS 13-320. In addition, Laser In-Situ Scattering and Transmissometry (LISST) data was co-collected with point samples using a Sequioa Scientific LISST-AOBS attached to the point sampler with a continuous datalogging system to collect continuous concentration data.\nTypes of samples collected:\nEDI samples: Equal Discharge Increment samples taken at Left, Left Center, Center, Right Center, and Right riverbank locations.\nBed material: samples taken from the bottom of the riverbed at each EDI vertical location.\nA set samples: EDI composite suspended sediment samples.\nB set samples: Replicate EDI composite suspended sediment samples.\nPoint samples: Individual suspended sediment samples collected at 0.1, 0.3, 0.5, 0.7, and 0.9 depths at the matching EDI vertical locations.\nDescription of tables:\n\u201cBelle Chasse Sampling Locations (Lat_Long).png\u201d contains the approximate latitude and longitude of the EDI sampling locations where samples were collected at USGS station 07374525. \n\u201cBelle Chasse Sampling Map.png\u201d shows the sampling locations at USGS station 07374525. \n\u201cBed Material.csv\u201d contains sieve size distribution data from the bed material samples collected at each EDI vertical location.  \n\u201cSand Fine Split (A set)\u201d contains sediment mass, concentration, and percent fines data from the A set suspended sediment samples. \n\u201cFines PSD (B set).csv\u201d contains averaged laser particle size distribution data on the B set fine sediment material (sediment smaller than 63 microns) processed on the Beckman Coulter LS 13 320 particle size analyzer for laser diffraction. \n\u201cFines PSD Raw Data (B set).csv\u201d contains all the raw laser data from each run for the \u201cFines PSD (B set).csv\u201d. \n\u201cSand PSD (B set).csv\u201d contains sieve particle size distribution data from the B set sand material (sediment bigger than 63 microns) as well as averaged laser particle size distribution data processed on the Beckman Coulter LS 13 320 particle size analyzer.\n\u201cSand PSD Raw Data (B set).csv\u201d contains the raw laser data for each run from the \u201cSand PSD (B set).csv\u201d. \n\u201cPoint Sample PSD.csv\u201d contains the concentration, total sediment, and the averaged laser particle size distribution data on the point samples processed on the Beckman Coulter LS 13 320 particle size analyzer for laser diffraction. \n\u201cPoint Sample PSD Raw Data.csv\u201d contains the raw laser data for each run from the \u201cPoint Sample PSD.csv\u201d. \n\u201cLISST Sample Information.csv\u201d contains the sample information that corresponds to the Raw LIIST-AOBS data in \u201cLISST Samples Raw Data.csv\u201d. \nReferences:\nMize, S.V., Gartelman, A., Simmons, L., Groseclose, G., Johnson, M., Genusa, M., Edens, G., Pahl, J., Fountain, J., Hendrix, P., Descant, M., 2026, Methods and Method Development for Sediment Surrogate Data Collection and Laboratory Analysis, Mississippi River at Belle Chasse, LA:  US Geological Survey Scientific Investigations Report.\nGuy, H.P., 1969, Techniques of Water-Resources Investigations of the United States Geological Survey: Laboratory Theory and Methods for Sediment Analysis, Chapter 2, p. 28; accessed July 12, 2021, at https://pubs.er.usgs.gov/publication/twri05C1.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P138ANHX", "description": "Landing page for access to the data", "format": "XML", "mediaType": "application/http", "title": "Digital Data"}, {"@type": "dcat:Distribution", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.68d59cb9d4be022332002bd7.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_68d59cb9d4be022332002bd7", "keyword": ["Bed Material", "Belle Chasse, Louisiana", "Mississippi River", "Sediment Concentration", "Sediment Laser Particle Size Distribution", "Sediment Particle Size Distribution", "Suspended Sediment", "USGS:68d59cb9d4be022332002bd7", "biota"], "modified": "2026-04-30T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-89.99039, 29.83945, -89.96395, 29.86923", "theme": ["geospatial"], "title": "Laboratory Analysis Results for Sediment Surrogate Samples, Mississippi River at Belle Chasse, Louisiana, 2019-2023"}