Use of GUEST Technology to Parameterize a Physically‐Based Model for Assessing Soil Erodibility and Evaluating Conservation Practices in Tropical Steeplands

Rose, C. W.; Misra, R. K.; Coughlan, K.; Fentie, B.

doi:10.1002/9781444328455.ch11

Cited by 8 publications

(8 citation statements)

References 43 publications

(30 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The decreasing trend in the parameter F as the stream power increases is in contrast with experimental observations of Proffitt et al (1993). Proffitt et al (1993) conclude that a constant value of 0.1 is appropriate for the fraction of the stream power expended in maintaining sediments in suspension, and this constant value has been subsequently used for field applications and experimental study of multiclass sediment deposition with flow impoundment as a result of vegetation buffer strips (Rose et al 2011;Hussein et al 2007). By comparison with this set of experiments considered in the paper, the flow condition used by Proffitt et al (1993) was much weaker and sediment concentration much smaller.…”

Section: Discussionmentioning

confidence: 82%

“…While material of this caliber is not typical of sediments carried by overland flows, Yalin's formula is implemented in WEPP because the formula performed favorably in comparison with several other formulas (Alonso et al 1981). For Griffith University Erosion System Template (GUEST), the sediment transport capacity is seen as a result of dynamic balance of simultaneous erosion and deposition processes (Hairsine and Rose 1992a;Misra and Rose 1996;Rose et al 2011). The conceptual basis for this approach can be traced back to Bagnold who assumed that a fraction of stream power would be expended on sediment transport (Bagnold 1966;Rose et al 1983a, b).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Transport Capacity of Overland Flow with High Sediment Concentration

Zhang

2015

J. Hydrol. Eng.

View full text Add to dashboard Cite

The concept and estimation of sediment transport capacity of overland flows are pivotal to soil erosion, sediment transport, and deposition modeling. There is a limited understanding of the effect of high sediment concentration on the transport capacity of overland flow, although sediments in suspension are known to affect turbulent mixing and settling velocity in rivers. A new functional relationship between a dimensionless parameter involving stream power and settling velocity and the volumetric concentration at the transport limit was developed using a set of flume experiments with slope up to 46.6%, unit discharge up to 50 cm 2 • s −1 , median particle size of 0.326 mm, and sediment concentration up to 1,140 kg • m −3. The new relationship has two theoretical limits on sediment concentration at the transport limit. Under low flow conditions, the sediment concentration is limited by the available stream power. At high stream power, the sediment concentration is limited by the space available in flow to accommodate sediments in motion. As a predictor of the sediment concentration at the transport limit, the new relationship worked very well with the Nash-Sutcliffe coefficient of efficiency of 0.95 and was shown to be superior to empirical relationships based on stream power and other commonly used predictors of the transport capacity for rivers. The paper also shows that formulas for the transport capacity which have been validated and widely used for rivers with high sediment concentrations are inaccurate and should not be used to predict the transport capacity of overland flow.

show abstract

Section: Discussionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Transport Capacity of Overland Flow with High Sediment Concentration

Zhang

2015

J. Hydrol. Eng.

View full text Add to dashboard Cite

show abstract

“…The efficacy of this infiltration equation, and its preference as a method of choice over the use of alternative infiltration models has been well established in multi‐country studies at runoff plot scale (Yu et al ., , ; Yu and Rose, ; Rose et al ., ).…”

Section: Methodsmentioning

confidence: 97%

“…In soil erosion, soil conservation and agricultural contexts, where experimental and field studies are generally concerned with shallower overland flows, other streams of literature have developed with a focus on physical process description (e.g. Hairsine and Rose, , ; Proffitt et al ., ; Misra and Rose, , ; Nearing et al ., ; Ciesiolka et al ., , ; Yu et al ., ; Fentie et al ., ; Sander et al ., , : Yu and Rose, ; Presbitero et al ., ; Rose et al ., , ; Armstrong et al ., ). This line of research has demonstrated the distinct advantages of the modelling approach of Hairsine and Rose (, ) in which multiple classes of settling velocity rather than particle size are used, and a distinction is made between the entrainment by flow of original soil profile material, or soil matrix, and the re‐entrainment of recently deposited material which is much weaker, and may offer negligible resistance to erosive processes.…”

Section: Introductionmentioning

confidence: 99%

The erosive growth of hillside gullies

Rose

Ward

Saxton

et al. 2014

Earth Surf Processes Landf

View full text Add to dashboard Cite

The rate of erosion of hillside gullies depends both on gully flow characteristics and the resistance offered by the gully soil profile to erosion. This paper describes a method for quantifying a physically‐based resistance measure, illustrated by application to a gully feeding sediment into the Bremer River, southeast Queensland, Australia. The dynamics of discharge down the gully during runoff events is the driver of erosion, but this was unknown. A new method is described whereby this unmeasured flow can be estimated using data on rainfall rate and river gauge monitoring. The data collected on the gully was the increase in dimensions and volume (and so soil loss) over a two year period. This information was obtained from a digital elevation model (DEM) of the catchment, derived from Light Detection and Ranging (LiDAR) observations made at either end of the two year period. The soil profile resistance characteristic evaluated is the energy required to erode a unit mass of soil from the gully walls, a physically‐defined parameter, J, present in flow‐driven erosion theory, which was adapted and applied to predict soil loss from the Bremer River gully. The value of J was evaluated by equating predicted to measured gully soil loss over the two year period using two alternative descriptions of gully cross‐section. Firstly a realistic gully shape description was used, made possible by LiDAR data, yielding J = 405.5 J/kg. Secondly, in order to allow use of more widely‐available aerial photography for such studies, the simplifying assumption of a semi‐circular gully shape was made, yielding J = 455 J/kg. Allowing a ±30% error in estimated effective runoff rate for this ungauged gully, the estimated J value would have an uncertainty of +1%/−7% using the actual gully geometry. The assumptions made in estimating J are discussed, and possible applications of this information listed. Copyright © 2014 John Wiley & Sons, Ltd.

show abstract

“…Values of F as large as ≈ 0.1 have been determined in shallow overland flows (e.g. Proffitt et al ., ; Yu et al ., ; Rose et al ., ). In contrast Bagnold () found values of about 0.015 for a similar factor with total suspended sediment in rivers.…”

Section: Discussionmentioning

confidence: 97%

Modelling suspended sediment concentration and load in a transport‐limited alluvial gully in northern Queensland, Australia

Rose

Shellberg

Brooks

2015

Earth Surf Processes Landf

View full text Add to dashboard Cite

ABSTRACT:Alluvial gullies are often formed in dispersible sodic soils along steep banks of incised river channels. Field data collected by Shellberg et al. (2013b) from a gully outlet in northern Australia showed little hysteresis between water discharge and fine (<63µm) and coarse (>63µm) suspended sediment, indicating transport-limited rather than source-limited conditions. The major source of the fine (silt/clay) component was the sodic soils of upstream gully scarps, and the coarser (sand) component was sourced locally from channel bed material. In this companion paper at the same study site, a new method was developed for combining the settling velocity characteristics of these two sediment source components to estimate the average settling velocity of the total suspended sediment. This was compared to the analysis of limited sediment samples collected during flood conditions. These settling velocity data were used in the steady-state transport limit theory of Hairsine and Rose (1992 a,b) that successfully predicted field data of concentrations and loads at a cross-section, regardless of the complexity of transport-limited upstream sources (sheet erosion, scalds, rills, gullies, mass failure, bank and bed erosion, other disturbed areas). The analysis required calibration of a key model parameter, the fraction of total stream power (F ≈ 0.025) that is effective in re-entraining sediment. Practical recommendations are provided for the prediction of sediment loads from other alluvial gullies in the region with similar hydrogeomorphic conditions, using average stream power efficiency factors for suspended silt/clay (F w ≈ 0.016) and sand (F s ≈ 0.038) respectively, but with no requirement for field data on sediment concentrations. Only basic field data on settling velocity characteristics from soil samples, channel geometry measurements, estimates of water velocity and discharge, and associated error margins are needed for transport limit theory predictions of concentration and load. This theory is simpler than that required in source-limited situations.

show abstract

Use of GUEST Technology to Parameterize a Physically‐Based Model for Assessing Soil Erodibility and Evaluating Conservation Practices in Tropical Steeplands

Cited by 8 publications

References 43 publications

Transport Capacity of Overland Flow with High Sediment Concentration

Transport Capacity of Overland Flow with High Sediment Concentration

The erosive growth of hillside gullies

Modelling suspended sediment concentration and load in a transport‐limited alluvial gully in northern Queensland, Australia

Contact Info

Product

Resources

About