Estimated Median Riverbed Grain Size (D50) throughout the Willamette River Basin, Oregon
Riverbed grain-size is an important indicator of geomorphic and ecological processes and conditions, as it provides a key building block for channel form and benthic aquatic habitats. Understanding the distribution of riverbed sediment throughout a basin can help inform a variety of river and ecosystem management questions. This dataset provides estimates of median riverbed grain-sizes (D50) throughout the Willamette River Basin for each segment of the medium resolution (1:100,000 scale) National Hydrography Dataset (NHD). These estimates were developed by applying the critical Shields equation using an approach similar to that described in Snyder and others (2013). This equation was parameterized at each NHD segment with two outputs from USGS StreamStats: a) the 0.5 annual exceedance probability streamflow (often referred to as the 2-year recurrence interval flow) and b) associated wetted width at that streamflow (herein bankfull width). Users are encouraged to carefully read the documentation to understand the assumptions and limitations of this dataset.
Snyder, N.P., Nesheim, A.O., Wilkins, B.C., and Edmonds, D.A., 2013, Predicting grain-size in gravel-bedded rivers using digital elevation models: Application to three Maine watersheds: GSA Bulletin, v. 125, no. 1–2, p. 148–163, at https://doi.org/10.1130/B30694.1.
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Complete Metadata
| @type | dcat:Dataset |
|---|---|
| accessLevel | public |
| bureauCode |
[ "010:12" ] |
| contactPoint |
{ "fn": "James S. White", "@type": "vcard:Contact", "hasEmail": "mailto:gs-w-or_sciencebase@usgs.gov" } |
| description | Riverbed grain-size is an important indicator of geomorphic and ecological processes and conditions, as it provides a key building block for channel form and benthic aquatic habitats. Understanding the distribution of riverbed sediment throughout a basin can help inform a variety of river and ecosystem management questions. This dataset provides estimates of median riverbed grain-sizes (D50) throughout the Willamette River Basin for each segment of the medium resolution (1:100,000 scale) National Hydrography Dataset (NHD). These estimates were developed by applying the critical Shields equation using an approach similar to that described in Snyder and others (2013). This equation was parameterized at each NHD segment with two outputs from USGS StreamStats: a) the 0.5 annual exceedance probability streamflow (often referred to as the 2-year recurrence interval flow) and b) associated wetted width at that streamflow (herein bankfull width). Users are encouraged to carefully read the documentation to understand the assumptions and limitations of this dataset. Snyder, N.P., Nesheim, A.O., Wilkins, B.C., and Edmonds, D.A., 2013, Predicting grain-size in gravel-bedded rivers using digital elevation models: Application to three Maine watersheds: GSA Bulletin, v. 125, no. 1–2, p. 148–163, at https://doi.org/10.1130/B30694.1. |
| distribution |
[ { "@type": "dcat:Distribution", "title": "Digital Data", "format": "XML", "accessURL": "https://doi.org/10.5066/P135DPSB", "mediaType": "application/http", "description": "Landing page for access to the data" }, { "@type": "dcat:Distribution", "title": "Original Metadata", "format": "XML", "mediaType": "text/xml", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.6802d7d8d4be0210cdcc9a31.xml" } ] |
| identifier | http://datainventory.doi.gov/id/dataset/USGS_6802d7d8d4be0210cdcc9a31 |
| keyword |
[ "Bedload", "Benton County", "Clackamas County", "Clackamas River Basin", "Coast Fork Willamette River Basin", "D50", "Lane County", "Linn County", "Long Tom River Basin", "Marion County", "McKenzie River Basin", "Multnomah County", "National Hydrologic Dataset", "Polk County", "Santiam River Basin", "Tualatin River Basin", "USGS:6802d7d8d4be0210cdcc9a31", "Washington County", "Willamette River Basin", "Yamhill County", "Yamhill River Basin", "bed material", "d50", "earth sciences", "environment", "geomorphology", "geoscientificInformation", "geospatial analysis", "grain-size", "inlandWaters", "modeling", "sediment model", "water resources management", "watershed management" ] |
| modified | 2025-09-18T00:00:00Z |
| publisher |
{ "name": "U.S. Geological Survey", "@type": "org:Organization" } |
| spatial | -123.7536, 43.3660, -121.6654, 45.7868 |
| theme |
[ "geospatial" ] |
| title | Estimated Median Riverbed Grain Size (D50) throughout the Willamette River Basin, Oregon |
