Variation in suspended sediment concentration during storms in five small catchments in southeast New South Wales

Olive, L. J.; Rieger, Wolfgang

doi:10.1111/j.1467-8470.1985.tb00477.x

Cited by 47 publications

(40 citation statements)

References 3 publications

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“…At the catchment scale, the most important link occurs between the hillslope and stream channel. Several studies have reported an increase in sediment yield immediately following logging, indicating that the hillslope and drainage system are indeed connected (Fredriksen, 1970;Graynoth, 1979;Anderson and Potts, 1987;Cornish and Binns, 1987;Olive and Rieger, 1987;Harr et al, 1988). Much of the soil movement by hillslope processes, however, appears to be dominated by deposition on slopes rather than direct delivery to streams (Swanson and Fredriksen, 1982).…”

Section: Sediment Sources and Deliverymentioning

confidence: 92%

Sediment transport, redistribution and storage on logged forest hillslopes in south-eastern Australia

1999

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Abstract:Post-logging changes in catchment sediment yield have traditionally been attributed to increases in hillslope erosion and delivery rates as a result of forest harvesting activities. Linking hillslope erosion to catchment yield in forestry environments remains dicult, however, primarily because of the scarcity of data on the nature of hillslope sediment storage and delivery processes. A large rainfall simulator (350 m 2 ) was used to apply rainstorms to a logged hillslope containing a snig track (skid trail) and a general logging or harvesting area (GHA) on 10 forest compartments in south-eastern Australia. The experiments con®rmed that the compacted, disturbed surfaces, such as roads and tracks, are the dominant sources of sediment in forestry areas. Sediment transport rates were limited by available sediment supply on both the snig track and the GHA, introducing important implications for the modelling of these surfaces using sediment transport capacity theories. Sediment delivery from the snig track to the adjacent GHA, via a cross-bank (drainage diversion), was strongly in¯uenced by the percentage ®ne fraction in the eroded sediment. Preferential deposition of coarse aggregates was measured at erosion control structures and on the adjacent GHA. Over 50% of ®ne-grained material were deposited on the hillslope over a relatively short,¯ow path length of 55 m, highlighting the eectiveness of runo diversion as a practice in reducing sediment¯ux. The transfer of water and sediment from disturbed to less disturbed parts of the landscape, and the associated potential for sediment storage, needs to be considered as part of any catchment impact assessment.

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Section: Sediment Sources and Deliverymentioning

confidence: 92%

Sediment transport, redistribution and storage on logged forest hillslopes in south-eastern Australia

1999

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“…Dominant vegetation is silvertop ash with stringybarks being common . Mean annual rainfall is in the order of 900-1000 mm, but is extremely variable (Olive & Rieger, 1985) . Storm runoff sediment concentration rarely exceeds 100 mg 1 -' in undisturbed catchment areas (Olive & Rieger, 1985) .…”

Section: Turbidity In Geebung Creek Catchmentmentioning

confidence: 99%

“…Olive & Rieger, 1985). An explanatory approach to stream sediment modelling thus requires accurate characterisation of the trend in concentration over time (Finlayson, 1985) .…”

Section: Introductionmentioning

confidence: 99%

The use of turbidimeters in suspended sediment research

Gippel

1989

Hydrobiologia

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Accurate characterisation of the trend in suspended sediment concentration in streams throughout runoff events requires a sampling interval much shorter than the one hour typically used . For logistical reasons this is not usually feasible, so continuously recording turbidimeters offer a potential alternative . The variety of correlations and relationships between sediment concentration and turbidity reported in the literature is not surprising in view of the many confounding effects present in natural stream systems . Data from five sites in a small forested catchment indicated variability in the turbidity-suspended sediment concentration relationship, but improvements were obtained by considering the effects of very fine sediment and background water colour . Throughout runoff events variations in sediment properties, organic acids concentration and turbulence can occur . It is concluded that a good linear relationship between turbidity and suspended sediment concentration should not necessarily be expected and any observed hysteresis could actually help explain erosion and transport processes . The detail and continuity of data generated by turbidimeters provides the opportunity for greater understanding of storm sediment dynamics, however, calibration requires careful consideration of site characteristics . 465

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“…We have attempted to link flow and sediment-supply conditions to predictable hydrometeorological events as a step toward development of a forecast model for large sediment-transport events. Piest et al, 1975Wood, 1977O'Loughlin et al, 1978Paustian and Beschta, 1979Doty et al, 1981Carling, 1983Olive and Rieger, 1985Sidle and Campbell, 1985 width of loop dependent upon degree of depletion. Bryan and Campbell, 1986Anderson and Potts, 1987Tassone, 1987Williams, 1989Smith and Olyphant, 1994Slattery and Burt, 1996 Alta Gully sidewalls are unstable in the deeply incised middle section ( Figure 3b).…”

Section: Introductionmentioning

confidence: 97%

Suspended sediment transport regime in a debris-flow gully on Vancouver Island, British Columbia

Nistor¹,

Church

2005

Hydrol. Process.

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Abstract:In debris-flow-prone channels, normal fluvial sediment transport occurs (nearly exclusively in suspended mode) between episodic debris-flow events. Observations of suspended sediment transport through a winter season in a steepland gully in logged terrain revealed two event types. When flows exceeded a threshold of 270 l s 1 , events yielded significant quantities of sediment and suspended sediment concentration increased with flow. Smaller events were strongly 'supply limited'; sediment concentration decreased as flow increased. Overall, there is no consistent correlation between runoff and sediment yield. Within the season, three subseasons were identified (demarcated by periods of freezing weather) within which a pattern of fine sediment replenishment and evacuation occurred. Finally, a signature of fine sediment mobilization and exhaustion was observed within individual events. Fine sediment transport occurred in discrete pulses within storm periods, most of the yield occurring within 5 to 15% of storm runoff duration, so that it is unlikely that scheduled sampling programs would identify significant transport. Significant events are, however, generally forecastable on the basis of regional heavy rainfall warnings, providing a basis for targeted observations. Radiative snowmelt events and rain-on-snow remain difficult to forecast, since the projection of temperatures from the nearest regular weather station yields variable results.

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Variation in suspended sediment concentration during storms in five small catchments in southeast New South Wales

Cited by 47 publications

References 3 publications

Sediment transport, redistribution and storage on logged forest hillslopes in south-eastern Australia

Sediment transport, redistribution and storage on logged forest hillslopes in south-eastern Australia

The use of turbidimeters in suspended sediment research

Suspended sediment transport regime in a debris-flow gully on Vancouver Island, British Columbia

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