Environmentally sensitive plot-scale timber harvesting: impacts on suspended sediment, bedload and bank erosion dynamics

Stott, Tim; Leeks, G. J. L.; Marks, S.; Sawyer, Adam

doi:10.1006/jema.2001.0459

Cited by 41 publications

(30 citation statements)

References 48 publications

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“…Water velocities (e.g., Biggs, 1995) and suspended sediment loads (Hicks & Griffiths, 1992;Hicks et al, 2000) were within the wide ranges observed during floods in New Zealand rivers. Our suspended sediment loads were similar to those observed during a managed reservoir release ($4000 mg l )1 , Robinson et al, 2004) and after low impact timber harvesting ($800 mg l )1 , Stott et al, 2001), but were considerably less than suspended sediment loads associated with use of earth moving equipment for timber harvest or heavy construction (up to 30,000 mg L )1 , Hicks & Griffiths, 1992). Our experimental sediments were New Zealand river sands (84% between 63 and 500 lm).…”

Section: Discussionsupporting

confidence: 73%

Short-term Effects of Elevated Velocity and Sediment Abrasion on Benthic Algal Communities

2006

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Of the mechanisms that remove benthic algae during flood disturbances, relatively little is known about the effects of sediment scour. We investigated suspended sediment scour using naturally colonized benthic algal communities exposed to realistic velocities and suspended sediment concentrations in a laboratory flowtank. Increased velocity alone removed benthic algal biomass, and high suspended sediment concentrations further increased algal removal. Efficacy of biomass removal by velocity and suspended sediments was community-specific; communities with a tightly adherent cohesive mat physiognomy were resistant to removal, despite taxonomic similarity to easily disturbed communities. In addition, some taxa were more susceptible to removal by disturbance than others. The duration of scour and physical refugia on the substratum also influenced algal biomass removal. Our results indicate that suspended sediment scour may be an important mechanism for algal removal during flood events, and some variability in biomass removal among flood events may be the result of differences in suspended sediment load.

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Section: Discussionsupporting

confidence: 73%

Short-term Effects of Elevated Velocity and Sediment Abrasion on Benthic Algal Communities

2006

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“…During the last quarter of the twentieth century land abandonment resulted in forest not being managed in this area, which was reinforced in 2002. As reported in previous studies (Stott, 1997a(Stott, , 1997bCroke et al, 1999;Stott et al, 2001;Croke et al, 2001;Mount et al, 2005), this recent forest management is likely to have implications on sediment production and which are discussed in this paper. Oppositely to the general trend in Mediterranean rural areas, agriculture practices within the study area never stopped and in consequence we have an available framework to study the role of the agriculture on soil erosion at the watershed scale.…”

Section: Introductionmentioning

confidence: 83%

The impact of agriculture on solute and suspended sediment load on a Mediterranean watershed after intense rainstorms

Outeiro

Úbeda

Farguell

2010

Earth Surf Processes Landf

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The solute and suspended-sediment load following fi ve rainstorms (2005)(2006)(2007) with varied intensities were studied at the Vernegà experimental watershed, north-western Spain. Two land-use areas are located within this watershed, the upstream one (forest) with 160 ha a 100% forested area, and the downstream one (agricultural) with 97 ha being 9 ha conventional agricultural fi eld and 88 ha forest. This study investigates the capacity of each land-use to yield water, suspended sediment concentration (SSC) and dissolved solid concentration (DSC). The hypothesis is that DSC and SSC from the agricultural area are greater than DSC and SSC of the forest area. Results showed that the agriculture area produced signifi cantly greater mean DSC than in the forest area, the main contribution was the Ca 2+ (24·68 ± 46·52 mg l −1 ) ion at the agricultural area. A long-term sediment production rate at the agricultural outlet was calculated (69·1 tonnes per 100 years) based on the total sediment discharge (TSD) and the recurrence interval of the largest event of the fi ve rainstorms (October 2005). Geographic information system (GIS) spatial data layers of the watershed were produced to determine the relation of tracks, landforms, slopes and forest management to SSC yield in the forest outlet (133·89 ± 308·14 mg l −1 ) during the fi ve rainstorms. Agriculture practices are the main cause of soil erosion at the study area.

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“…Total estimated bed load yields for both the forested and moorland areas of the Trannon catchment combined (between 2 and 3 t km À2 year À1 ) compare well with others in mid-Wales. Bed load yield examples from the adjacent catchments include wholly moorland yields of between 0.91 (Sawyer, 1999;Stott et al, 2001) and 6.4 t km À1 year À1 (Moore and Newson, 1986) and wholly mature forest yields ranging between 8.8 and 11.8 t km À2 year À1 (Leeks, 1992). It is clear that lateral bed load input from banks forms an important bed load source in all cases with lateral bed load inputs exceeding those of upstream inputs in all but the second budget period (19.06.98-14.02.99).…”

Section: The Contemporary Lowland Bed Load Budgetmentioning

confidence: 99%

An assessment of the impact of upland afforestation on lowland river reaches: the Afon Trannon, mid-Wales

2005

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Environmentally sensitive plot-scale timber harvesting: impacts on suspended sediment, bedload and bank erosion dynamics

Cited by 41 publications

References 48 publications

Short-term Effects of Elevated Velocity and Sediment Abrasion on Benthic Algal Communities

Short-term Effects of Elevated Velocity and Sediment Abrasion on Benthic Algal Communities

The impact of agriculture on solute and suspended sediment load on a Mediterranean watershed after intense rainstorms

An assessment of the impact of upland afforestation on lowland river reaches: the Afon Trannon, mid-Wales

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