Determining Erodibility, Critical Shear Stress, and Allowable Discharge Estimates for Cohesive Channels: Case Study in the Powder River Basin of Wyoming

Thoman, Robert W.; Niezgoda, Sue L.

doi:10.1061/(asce)0733-9429(2008)134:12(1677)

Cited by 59 publications

(47 citation statements)

References 33 publications

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“…The relationship between τ c and k d from the MPS-BM for the jet device dataset among the 21 Tennessee sites showed an inverse power relationship ( Figure 6). The linear relationship between τ c and k d is consistent with others [4,8,14], however the MPS result in this study scales higher for the erodibility parameters.…”

Section: Comparison Of Mps Methods and Computational Procedures For Ersupporting

confidence: 92%

Estimating Erodibility Parameters for Streambanks with Cohesive Soils Using the Mini Jet Test Device: A Comparison of Field and Computational Methods

Mahalder

Schwartz

Palomino

et al. 2018

Water

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Abstract:The jet test device has been predominantly used for in situ critical shear stress (τ c ) and erodibility coefficient (k d ) measurements of cohesive streambanks/beds using three analytical procedures: the Blaisdell method (BM), the iterative approach (IP), and the scour depth approach (SDP). Existing studies have reported that τ c and k d estimates can be influenced by the computational procedure, time intervals for scour-hole depth measurements, and the pressure head selection. This study compared estimates of τ c and k d among the three computational procedures using single and multiple pressure settings (SPS, MPS). A new method is introduced applying incrementally increasing pressure heads, hypothesizing depth-averaged erodibility parameters would be generated that better represent bank and fluvial erosion. Estimates of τ c applying the MPS-BM procedure were greater by 17% to 100% compared with SPS-BM procedures and k d estimates were lower with less variability (σ = 3.54) compared with other procedures from 126 jet tests among 21 Tennessee stream sites. This finding supports the hypothesis of increasing τ c and decreasing k d with greater soil depths into the bank, suggesting the MPS-BM procedure can improve the estimation of τ c and k d using the mini-jet test device. Overall, this study demonstrates the need to standardize field and computational procedures.

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Section: Comparison Of Mps Methods and Computational Procedures For Ersupporting

confidence: 92%

Estimating Erodibility Parameters for Streambanks with Cohesive Soils Using the Mini Jet Test Device: A Comparison of Field and Computational Methods

Mahalder

Schwartz

Palomino

et al. 2018

Water

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“…When compared to other studies [13,29,[48][49][50], less variability in erodibility parameters was observed along FC-FM and FC-WC. In addition, soil physical properties, percent sand, silt and clay, d 50 , and BD within the Fort Cobb watershed, exhibited less variation than soil properties in most of the other studies.…”

Section: Variability Of Erodibility Parameterscontrasting

confidence: 76%

“…The standard deviations were generally small when compared to the means for all properties for both soil layers, with the exception being d50 for FC-WC. A similar degree of watershed-scale variability in erodibility parameters and soil physical properties to that of IL-IR and IL-BF was observed by Thoman and Niezgoda [50] in the Powder River Basin of Wyoming. A higher degree of variability in erodibility parameters was observed for the Illinois River watershed than the Fort Cobb Reservoir watershed (Figure 3).…”

Section: Variability Of Erodibility Parameterssupporting

confidence: 71%

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Watershed Variability in Streambank Erodibility and Implications for Erosion Prediction

Enlow

Fox

Guertault

2017

Water

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Abstract:Two fluvial erosion models are commonly used to simulate the erosion rate of cohesive soils: the empirical excess shear stress model and the mechanistic Wilson model. Both models include two soil parameters, the critical shear stress (τ c ) and the erodibility coefficient (k d ) for the excess shear stress model and b 0 and b 1 for the Wilson model. Jet erosion tests (JETs) allow for in-situ determination of these parameters. JETs were completed at numerous sites along two streams in each the Illinois River and Fort Cobb Reservoir watersheds. The objectives were to use JET results from these streambank tests to investigate variability of erodibility parameters on the watershed scale and investigate longitudinal trends in streambank erodibility. The research also determined the impact of this variability on lateral retreat predicted by a process-based model using both the excess shear stress model and the Wilson model. Parameters derived from JETs were incorporated into a one-dimensional process-based model to simulate bank retreat for one stream in each watershed. Erodibility parameters varied by two to five and one to two orders of magnitude in the Illinois River watershed and Fort Cobb Reservoir watershed, respectively. Less variation was observed in predicted retreat by a process-based model compared to the input erodibility parameters. Uncalibrated erodibility parameters and simplified applied shear stress estimates failed to match observed lateral retreats suggesting the need for model calibration and/or advanced flow modeling.

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“…The selection of variables for the soil properties to be tested is based upon the works of previous researches on channel erosion such as [14], [15], [10], [16], [17], [18] and [12]. More recent relationship established are from [19], [20] and [21].…”

Section: Fig 2 Post Jed Test Soil Conditionmentioning

confidence: 99%

ESTABLISHMENT OF JET INDEX Ji FOR SOIL ERODIBILITY COEFFICIENTS USING JET EROSION DEVICE (JEd)

Ibrahim

Abdullah

Hashim

et al. 2017

GEOMATE

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Soil erodibility has been identified as one of the major factors that govern threshold of resistance to erosion. Accurate measurement of soil erodibility in the field is indeed important for the determination of critical shear stresses. Critical shear stress is the stress that initiates particle movement that promotes shifting of the bankline. An attempt to establish soil erodibility parameters was successfully carried out using a newly fabricated Jet Erosion Device (JEd) based on soil properties. Soil erodibility coefficients are introduced to represent the erodibility of the soils under study. Statistical test is used to confirm the validity and accuracy of the proposed technique. Field data measurements were carried out on 3 rivers. Empirical models were developed using data from Selangor River and validated using data from Bernam and Lui rivers and other secondary river data. Analyses have shown high correlations and the parameters were further examined and analysed for the development of a predictive relationship for J i . The most accurate model was selected based on the adjusted R 2 , standard error of the estimate and discrepancy ratio to illustrate its significance. Selection of the predictive variables was based on their ability to explain the variation of J i . The models established could significantly reduce the cost, time and usage of water supply for field data collection using JEd.

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Determining Erodibility, Critical Shear Stress, and Allowable Discharge Estimates for Cohesive Channels: Case Study in the Powder River Basin of Wyoming

Cited by 59 publications

References 33 publications

Estimating Erodibility Parameters for Streambanks with Cohesive Soils Using the Mini Jet Test Device: A Comparison of Field and Computational Methods

Estimating Erodibility Parameters for Streambanks with Cohesive Soils Using the Mini Jet Test Device: A Comparison of Field and Computational Methods

Watershed Variability in Streambank Erodibility and Implications for Erosion Prediction

ESTABLISHMENT OF JET INDEX Ji FOR SOIL ERODIBILITY COEFFICIENTS USING JET EROSION DEVICE (JEd)

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