Evaluation of stability threshold analysis as a cursory method of screening potential streambank stabilization techniques

Frothingham, Kelly M.

doi:10.1016/j.apgeog.2007.07.006

Cited by 13 publications

(7 citation statements)

References 10 publications

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“…; Buffington and Montgomery, ; Kaufmann et al. ; Kappesser, ; Jowett, ; Frothingham, ). To our knowledge, only one study equates the stability threshold with that of the entrainment threshold of D 84 (Olsen et al.…”

Section: Channel Stabilitymentioning

confidence: 97%

“…Existing models are at odds with our view of channel stability; almost all indices use the mobility threshold of the D 50 ( c50 ) as that which controls the threshold of channel stability/instability (e.g., Dietrich et al, 1989;Buffington and Montgomery, 1999;Kaufmann et al, 2008;Kappesser, 2002;Jowett, 1989;Frothingham, 2008). To our knowledge, only one study equates the stability threshold with that of the entrainment threshold of D 84 (Olsen et al, 1997).…”

Section: Channel Stabilitymentioning

confidence: 99%

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Breaking from the average: Why large grains matter in gravel‐bed streams

MacKenzie

Eaton

Church

2018

Earth Surf Processes Landf

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While the influence of large grains on the morphodynamics of gravel‐bed rivers has long been recognized, nothing dominates our collective efforts to model such rivers like the bed surface D50, which turns up in virtually all the relevant equations. While researchers interested in flow resistance have recognized the relative importance of large grains and have modified flow resistance equations accordingly, there have been few attempts to quantify the effects of large grains on gravel‐bed river morphodynamics. However, there is little evidence that D50 exerts first‐order control over the physics occurring along the channel boundary, and its prevalence seems to be primarily based on the untested, a priori assumption that the best description of a distribution is the mean or median value. This commentary questions the long‐standing assumption that D50 is the best choice for characteristic grain size, and uses evidence from previous studies to show that mobilization of the largest grains in the bed likely controls morphological stability, and possibly sediment transport. © 2018 John Wiley & Sons, Ltd.

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Section: Channel Stabilitymentioning

confidence: 97%

Section: Channel Stabilitymentioning

confidence: 99%

Breaking from the average: Why large grains matter in gravel‐bed streams

MacKenzie

Eaton

Church

2018

Earth Surf Processes Landf

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“…For that reason, shear stress is a parameter that better represents hydraulic forces and therefore is more useful in calculating threshold conditions and determining appropriate channel lining materials than velocity alone. Stability threshold analysis for bank stabilization most often considers permissible velocity and shear stress thresholds together (Frothingham 2008).…”

Section: Flow Velocitymentioning

confidence: 99%

Stability Thresholds and Performance Standards for Flexible Lining Materials in Channel and Slope Restoration Applications

Miller¹,

Fischenich²,

Thornton³

2012

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Selecting the right channel and bank stabilization materials for channel restoration is critical, but is complicated by the limited availability of comprehensive performance criteria, an increasing number of new materials, and limited information regarding installation methods. Performance criteria for channel stabilization materials have traditionally focused on hydraulic parameters such as shear stress and flow velocity, but field performance of these materials is also dependent on non-hydraulic factors. Material selection, design, construction, and installation procedures are all critical to performance and project success. This technical note is intended to supplement recommendations provided in ERDC TN-EMRRP-SR-29, "Stability Thresholds for Stream Restoration Materials" (Fischenich 2001), which focused on hydraulic performance data for a variety of materials. This supplement focuses on flexible channel lining materials. An overview of selected design and installation criteria is provided, including critical materials properties, regional or climatic conditions, ecological considerations, and specific project applications. Project failure mechanisms are also discussed. Recommendations for product selection and field installation monitoring are summarized.

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“…While effective for water storage, the dam was shown to retain more than half of the sediment produced in the basin, resulting in a negative sedimentary balance and erosion at Eressos Beach downstream of the dam. Frothingham (2008) evaluated stability threshold analysis for four reaches of Cazenovia Creek, NY, where bank erosion has been occurring. Measured lowflow and bankfull flow velocity and shear stress values for each reach were compared with permissible thresholds for several biotechnical bank stabilization methods, and results indicated that stability velocity and shear stress values for this study's sites fall within permissible thresholds for biotechnical streambank stabilization methods.…”

Section: Demonstrated This Relation Through Consideration Of the Littmentioning

confidence: 99%