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Bulk samples of streambed sediment from two reaches of the lower Merced River, California

Metadata Updated: October 28, 2023

Bulk samples of streambed sediment were collected from two reaches of the lower Merced River in California's Central Valley to support research intended to evaluate the extent to which large-scale restoration projects provided improved salmon spawning habitat. A related goal of this study was to improve our understanding of the geomorphic factors influencing spawning site selection by salmon. The bulk samples were acquired during the summer of 2016 at the Merced River Ranch and Robinson Reach field sites using a McNeil sampler [McNeil and Ahnell, 1964]. Before collecting each sample, the surface layer was removed to avoid including surface grains as part of the sample. Surface material was scraped off to a depth equal to the diameter of the largest particle found on the surface. The subsurface material was collected to a depth of 0.3 m and grain size distribution data were obtained by running the bulk sample through a series of sieves with screens ranging from 0.063 - 128 mm [Bunte and Abt, 2001]. We used existing bulk sample data of the initial sediment stockpile of the Robinson Reach, which was collected by California Department of Water Resources in 2002 [CADWR, 2005]. Additional bulk sample data were collected during the summer of 2016 at the Merced River Ranch and Robinson Reach field sites. References Bunte, K., and S. R. Abt (2001), Sampling surface and subsurface particle-size distributions in wadable gravel- and cobble-bed streams for analyses in sediment transport, hydraulics, and streambed monitoring, Gen. Tech. Rep. RMRS-GTR-74,113, Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, 428 p. CADWR (2005), The Merced River Salmon Habitat Enhancement Project: Robinson Reach Phase III, 159 pp., California Department of Water Resources, San Joaquin District, Fresno, CA. McNeil, W. J., and W. H. Ahnell (1964), Success of pink salmon spawning relative to size of spawning bed materials, U.S. Fish and Wildlife Service, Special Scientific Report – Fisheries 469, Washington, D.C.

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Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date June 1, 2023
Metadata Updated Date October 28, 2023

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date June 1, 2023
Metadata Updated Date October 28, 2023
Publisher U.S. Geological Survey
Identifier USGS:5bda24c1e4b0b3fc5cec584b
Data Last Modified 20200827
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id 5f154210-168b-40aa-ad1d-3687e7f8e8bb
Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
Harvest Source Title DOI EDI
Metadata Type geospatial
Old Spatial -120.62164306185,37.433431483512,-120.39093017124,37.542399579313
Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Geological Survey
Source Datajson Identifier True
Source Hash 3d7cb1c086d0d3dfc6fb30c5466ddbe00f7204906ca975552f1bcbbb24ccb73a
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -120.62164306185, 37.433431483512, -120.62164306185, 37.542399579313, -120.39093017124, 37.542399579313, -120.39093017124, 37.433431483512, -120.62164306185, 37.433431483512}

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