Urban sediment transport through an established vegetated swale

Long term treatment efficiencies and deposition

Deonie Allen, Valerie Olive, Scott Arthur, Heather Haynes

Research output: Contribution to journalArticle

Abstract

Vegetated swales are an accepted and commonly implemented sustainable urban drainage system in the built urban environment. Laboratory and field research has defined the effectiveness of a vegetated swale in sediment detention during a single rainfall-runoff event. Event mean concentrations of suspended and bed load sediment have been calculated using current best analytical practice, providing single runoff event specific sediment conveyance volumes through the swale. However, mass and volume of sediment build up within a swale over time is not yet well defined. This paper presents an effective field sediment tracing methodology and analysis that determines the quantity of sediment deposited within a swale during initial and successive runoff events. The use of the first order decay rate constant, k, as an effective pollutant treatment parameter is considered in detail. Through monitoring tagged sediment deposition within the swale, the quantity of sediment that is re-suspended, conveyed, re-deposited or transported out of the swale as a result of multiple runoff events is illustrated. Sediment is found to continue moving through the vegetated swale after initial deposition, with ongoing discharge resulting from resuspension and conveyance during subsequent runoff events. The majority of sediment initially deposited within a swale is not detained long term or throughout its design life of the swale.

Original languageEnglish
Pages (from-to)1046-1067
Number of pages22
JournalWater
Volume7
Issue number3
DOIs
Publication statusPublished - 12 Mar 2015

Keywords

  • RARE-EARTH-ELEMENT
  • SOIL-EROSION
  • CONSTRUCTED WETLANDS
  • BUFFER STRIP
  • TRACER
  • OXIDES
  • CS-137
  • RADIONUCLIDES
  • RESERVOIR
  • RUNOFF

Cite this

Allen, Deonie ; Olive, Valerie ; Arthur, Scott ; Haynes, Heather. / Urban sediment transport through an established vegetated swale : Long term treatment efficiencies and deposition. In: Water. 2015 ; Vol. 7, No. 3. pp. 1046-1067.
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Urban sediment transport through an established vegetated swale : Long term treatment efficiencies and deposition. / Allen, Deonie; Olive, Valerie; Arthur, Scott; Haynes, Heather.

In: Water, Vol. 7, No. 3, 12.03.2015, p. 1046-1067.

Research output: Contribution to journalArticle

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AU - Allen, Deonie

AU - Olive, Valerie

AU - Arthur, Scott

AU - Haynes, Heather

N1 - "This study is supported by the Engineering and Physical Sciences Research Council (EPSRCEP/J501335/1 and EP/K50337X/1) and the Heriot-Watt University School of the Built Environment. It has been completed as part of the EPSRC Blue-Green Cities Consortium project. Significant support has been provided by the Scottish Universities Environmental Research Centre."

PY - 2015/3/12

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N2 - Vegetated swales are an accepted and commonly implemented sustainable urban drainage system in the built urban environment. Laboratory and field research has defined the effectiveness of a vegetated swale in sediment detention during a single rainfall-runoff event. Event mean concentrations of suspended and bed load sediment have been calculated using current best analytical practice, providing single runoff event specific sediment conveyance volumes through the swale. However, mass and volume of sediment build up within a swale over time is not yet well defined. This paper presents an effective field sediment tracing methodology and analysis that determines the quantity of sediment deposited within a swale during initial and successive runoff events. The use of the first order decay rate constant, k, as an effective pollutant treatment parameter is considered in detail. Through monitoring tagged sediment deposition within the swale, the quantity of sediment that is re-suspended, conveyed, re-deposited or transported out of the swale as a result of multiple runoff events is illustrated. Sediment is found to continue moving through the vegetated swale after initial deposition, with ongoing discharge resulting from resuspension and conveyance during subsequent runoff events. The majority of sediment initially deposited within a swale is not detained long term or throughout its design life of the swale.

AB - Vegetated swales are an accepted and commonly implemented sustainable urban drainage system in the built urban environment. Laboratory and field research has defined the effectiveness of a vegetated swale in sediment detention during a single rainfall-runoff event. Event mean concentrations of suspended and bed load sediment have been calculated using current best analytical practice, providing single runoff event specific sediment conveyance volumes through the swale. However, mass and volume of sediment build up within a swale over time is not yet well defined. This paper presents an effective field sediment tracing methodology and analysis that determines the quantity of sediment deposited within a swale during initial and successive runoff events. The use of the first order decay rate constant, k, as an effective pollutant treatment parameter is considered in detail. Through monitoring tagged sediment deposition within the swale, the quantity of sediment that is re-suspended, conveyed, re-deposited or transported out of the swale as a result of multiple runoff events is illustrated. Sediment is found to continue moving through the vegetated swale after initial deposition, with ongoing discharge resulting from resuspension and conveyance during subsequent runoff events. The majority of sediment initially deposited within a swale is not detained long term or throughout its design life of the swale.

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KW - SOIL-EROSION

KW - CONSTRUCTED WETLANDS

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KW - TRACER

KW - OXIDES

KW - CS-137

KW - RADIONUCLIDES

KW - RESERVOIR

KW - RUNOFF

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