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Overview
Basics
Basics
Enhance and further validate the predictive, numerical models CONCEPTS and BSTEM to fully realize their potential as state-of the-art tools for stream management.
Completed
2007
2007
2013
$443,337
Kat McIntyre (KMcIntyre@trpa.gov)
10/02/2017
10/02/2017
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| Location Information | Location Notes |
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Organizations
Organizations
EIP Details
EIP Basics
EIP Basics
04.01.01.0064 - P003: Experiments, Model Development and Bank Stability Simulations to Assess Bank Erosion Rates and Potential Mitigation Strategies
Performance Measures
Expected Performance Measures
Expected Performance Measures
No expected performance measures set for this project.
Reported Performance Measures
Reported Performance Measures
No annual performance measure accomplishments entered for this project.
Funding
Expected Funding
Expected Funding
$443,337
$443,337
$0
| Total | |||
|---|---|---|---|
| Unknown or Unassigned | $443,337 | $443,337 | $0 |
| Grand Total | $443,337 | $443,337 | $0 |
Reported Expenditures
Reported Expenditures
No expenditures have been reported for this project.
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Other Details
Watersheds
No watersheds set for this project.
Threshold Categories
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Streambank erosion has been estimated to account for about 25% of the total fine-sediment load entering Lake Tahoe. Much of this material emanates from unstable reaches of the Upper Truckee River, while Blackwood and Ward Creeks are also large contributors. Stream restoration has been accepted as an appropriate method to mitigate bank and channel instability, improve water quality, and contribute to other Basin Thresholds, with significant investment in planning, design, and implementation over several years.
Local and Regional Plans
No Local and Regional Plans set for this project.
Related Projects
Related Projects
No Related Projects set for this project.
External Links
No external links entered.
Notes
Notes
| 09/06/2017 5:05 PM | System | Lead Implementer: USDA Agricultural Research Service | ||
| 09/06/2017 5:05 PM | System | Objectives: The primary objectives of the proposed study are to enhance and further validate the predictive, numerical models CONCEPTS and BSTEM to fully realize their potential as state-of the-art tools for stream management, in the Lake Tahoe Basin and elsewhere. The project-scale data collection and resultant model enhancement will specifically inform adaptive management strategies for local restored streams, and the validated models will be available for use in evaluating design and expected performance of proposed restoration projects. Specific study objectives include: • Quantifying the effects of riparian vegetation and bio-engineered treatments on the resistance of bank materials to hydraulic erosion and bank undercutting for inclusion into both models. • Developing a near-bank groundwater model to integrate with CONCEPTS and BSTEM for the purpose of simulating pore-water pressures dynamically. • Developing algorithms for CONCEPTS to simulate lateral migration of meandering channels in a deterministic fashion by accounting for hydraulic and geotechnical controls. • Validate the use of the CONCEPTS and BSTEM models at the project-scale for existing and restored reaches of selected Tahoe Basin streams using time-series historical data on flow, sediment transport and channel geometry. The underlying hypothesis of this research effort is that with improved definition of the effects of vegetation and other bio-engineered treatments on boundary resistance coupled with enhanced algorithms to simulate channel response, resource managers in the Lake Tahoe Basin will have the ability to accurately evaluate restoration strategies to reduce fine-sediment loadings to the lake with state-of the-art numerical tools. |
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| 09/06/2017 5:03 PM | System | Findings: • Results of model simulations support the original hypothesis that failing to account for the erosion resistance of riparian roots resulted in over-estimation of bank erosion. • The increased critical shear stress of bank-surface due to the below ground biomass is accounted for by increasing the value obtained for bare soil by an order of magnitude. • BSTEM was improved by adding the Tahoe Basin riparian species to the database in the RipRoot submodel. Significant changes were also made to the original BSTEM-Static model to create BSTEM-Dynamic, capable of handling continuous hydrograph data, and incorporating a near-bank groundwater model. • Overall erosion volumes for the 13 month period modeled were 0.75, 2.64 and 5.95 m3 per m of bank for the Upper Truckee River (UTR) Hole 6, UTR54 and UTR3 sites respectively. Total eroded volumes at the Trout Creek sites were lower than the Upper Truckee sites at 0.45 and 0.24 m3 per m of bank erosion for Trout1 and Trout4 respectively. The differences between the two rivers were a result of both the general difference in bank heights (approximately 1.5 to 2m banks on the Upper Truckee, versus approximately 0.5 to 1m on Trout Creek), and the cohesion of the material at the sites. *** See www.fs.fed.us/PSW/partnerships/tahoescience for additional findings. |
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| 09/06/2017 5:02 PM | System | Management Implications: • The CONCEPTS and BSTEM models are ideal numerical tools for addressing the types of critical issues concerning stream-restoration design and performance aimed towards reducing fine-sediment loadings to Lake Tahoe. • The project-scale data collection and resultant model enhancement will specifically inform adaptive management strategies for local restored streams and the validated models will be available for use in evaluating design and expected performance of proposed restoration projects. • The most effective mitigation strategies were those that were able to reduce or prevent hydraulic erosion from the bank toe and bank face. By reducing the volume of erosion from these areas of the bank, the geotechnical stability of the banks tended to remain higher as the banks did not become oversteepened or undercut. • Model runs involving the growth of riparian trees also indicated that root-reinforcement can be a significant factor for maintaining geotechnical stability, but only once they have matured enough for the roots to cross potential failures planes within the banks. *** See www.fs.fed.us/PSW/partnerships/tahoescience for additional management implications. |
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| 09/06/2017 5:00 PM | System | Management Implications: • The CONCEPTS and BSTEM models are ideal numerical tools for addressing the types of critical issues concerning stream-restoration design and performance aimed towards reducing fine-sediment loadings to Lake Tahoe. • The project-scale data collection and resultant model enhancement will specifically inform adaptive management strategies for local restored streams and the validated models will be available for use in evaluating design and expected performance of proposed restoration projects. • The most effective mitigation strategies were those that were able to reduce or prevent hydraulic erosion from the bank toe and bank face. By reducing the volume of erosion from these areas of the bank, the geotechnical stability of the banks tended to remain higher as the banks did not become oversteepened or undercut. • Model runs involving the growth of riparian trees also indicated that root-reinforcement can be a significant factor for maintaining geotechnical stability, but only once they have matured enough for the roots to cross potential failures planes within the banks. *** See www.fs.fed.us/PSW/partnerships/tahoescience for additional management implications. |
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| 09/06/2017 4:58 PM | System | Publications: www.fs.fed.us/PSW/partnerships/tahoescience Garcia, M. H., Motta D., Abad, Jorge D., Langendoen, Eddy J. “A computational platform for physically-based bank evolution and long-term meander migration.” I Congreso Internacional de Hidrología de Llanuras Azul, Buenos Aires, Argentina – 21 al 24/09/2010 página - página Motta, D., Abad, J. D., Langendoen, E. J., Garcia, M. H. “Merging of RVR Meander with CONCEPTS: Simplified 2D model for long-term meander evolution.” River, Coastal and Estuarine Morphodynamics: RCEM 2009 – Vionnet et al. (eds) Langendoen, E. J. 2011. Application of the CONCEPTS channel evolution model in stream restoration strategies. Stream Restoration in Dynamic Fluvial Systems, 487-502. Simon, A., Pollen-Bankhead, N., & Thomas, R. E. 2011. Development and application of a deterministic bank stability and toe erosion model for stream restoration. Stream Restoration in Dynamic Fluvial Systems, 453-474. Motta, D., Abad, J. D., Langendoen, E. J., & Garcia, M. H. 2012. A simplified 2D model for meander migration with physically-based bank evolution.Geomorphology, 163, 10-25. Motta, D., Abad, J. D., Langendoen, E. J., & García, M. H. 2012. The effects of floodplain soil heterogeneity on meander planform shape. Water Resources Research, 48(9). |