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Surveys of channel bed topography from two restored reaches of the lower Merced River, California

Metadata Updated: October 29, 2023

Surveys of channel and floodplain topography were used to characterize the morphology of two reaches of the lower Merced River in California's Central Valley and to parameterize a hydraulic model. These data were collected 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. At the Merced River Ranch field site, river channel and floodplain topography was measured using a combination of real-time kinematic (RTK) GPS for wadable parts of the channel, an echo sounder for deep pools, and photogrammetry on dry land [CFS, 2013]. The raw point data were used to generate a triangular irregular network (TIN) and the TIN was converted to a 1 m raster using natural neighbor interpolation. For the 2.5 km long Robinson Reach field site, bed topography was surveyed during the summer of 2012 using real-time kinematic (RTK) GPS, with a mean cross-section spacing of 7 m. The original survey points were interpolated to form a continuous surface using kriging methods developed for curved river channels [Legleiter and Kyriakidis, 2008]. The result of the kriging was a digital elevation model (DEM) of the river channel and 10 m of the floodplain adjacent to each bank, with a spatial resolution of 1 m.

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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 29, 2023

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date June 1, 2023
Metadata Updated Date October 29, 2023
Publisher U.S. Geological Survey
Identifier USGS:5bd9e882e4b0b3fc5cec09e8
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 2314db15-fdf1-407b-9c76-51ea83bcc755
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 695d28a5f63dc67afca6e290d0bfd7cc550ae424f2433557aa8514f2837c5a90
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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