ENV-2023-045 A Three-Tiered Approach to Assess Erosion and Deposition on and Downstream from New Melones Dam's Auxiliary Spillway Final Report
We developed a novel three-tiered approach to quantify and spatially represent zones of
sediment erosion, bedrock erosion, and subsequent sediment deposition associated with a range
of flow events on an unlined spillway at New Melones Dam, located approximately 45 miles
northeast of Modesto, California. Our three-tiered approach includes the application of: (1) the
Sedimentation and River Hydraulics two-dimensional (SRH-2D) sediment transport model to
inform sediment removal and deposition; (2) a two-dimensional (2D) probabilistic erosion model
using the Annandale Erodibility Index Method (Annandale, 1995) to inform the potential for
bedrock erosion across the full spatial extent of the spillway; and (3) the Hurst one-dimensional
(1D) Erosion model (H1DE), a 1D bedrock incision model (Hurst et al., 2021), to inform the
timing and magnitude of vertical incision into bedrock and the potential for knickpoint (headcut)
propagation.
Resources
2 resources available
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RISE Item Details Page URL for "ENV-2023-045 A Three-Tiered Approach to Assess Erosion and Deposition on and Downstream from New Melones Dam's Auxiliary Spillway Final Report"
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PDF File for "ENV-2023-045 A Three-Tiered Approach to Assess Erosion and Deposition on and Downstream from New Melones Dam's Auxiliary Spillway Final Report"
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Complete Metadata
| @type | dcat:Dataset |
|---|---|
| accessLevel | public |
| accrualPeriodicity | irregular |
| bureauCode |
[ "010:10" ] |
| contactPoint |
{ "fn": "RISE Team", "@type": "vcard:Contact", "hasEmail": "mailto:data@usbr.gov" } |
| description | We developed a novel three-tiered approach to quantify and spatially represent zones of sediment erosion, bedrock erosion, and subsequent sediment deposition associated with a range of flow events on an unlined spillway at New Melones Dam, located approximately 45 miles northeast of Modesto, California. Our three-tiered approach includes the application of: (1) the Sedimentation and River Hydraulics two-dimensional (SRH-2D) sediment transport model to inform sediment removal and deposition; (2) a two-dimensional (2D) probabilistic erosion model using the Annandale Erodibility Index Method (Annandale, 1995) to inform the potential for bedrock erosion across the full spatial extent of the spillway; and (3) the Hurst one-dimensional (1D) Erosion model (H1DE), a 1D bedrock incision model (Hurst et al., 2021), to inform the timing and magnitude of vertical incision into bedrock and the potential for knickpoint (headcut) propagation. |
| distribution |
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| identifier | https://datainventory.usbr.gov/rise/item/128539 |
| keyword |
[ "Dam Safety", "Erosion", "Spillway" ] |
| landingPage | https://data.usbr.gov/catalog/7983/item/128539 |
| modified | 2025-11-19T21:09:06Z |
| publisher |
{ "name": "Bureau of Reclamation", "@type": "org:Organization" } |
| spatial |
"{"type":"Point","coordinates":[-120.525,37.9481]}"
|
| title | ENV-2023-045 A Three-Tiered Approach to Assess Erosion and Deposition on and Downstream from New Melones Dam's Auxiliary Spillway Final Report |
