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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 taggedsediment 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.
Title:Urban Sediment Transport through an Established Vegetated Swale: Long Term Treatment Efficiencies and Deposition
Secondary title: if applicable
Language: English
Creator: Heather Haynes
Division: Heriot-Watt University : School of Energy, Geoscience, Infrastructure and Society : Edinburgh Campus UK
Research Institute and Centre: Water Academy
Contributors: D Allen, V Olive, S Arthur, H Haynes
Corporate Creators:
Funders: Engineering & Physical Sciences Research Council
Grant: EPSRC EP/J501335/1 and EP/K50337X/1
Data type: Physical sample analytical results
Collection dates: Between November 2013-February 2015
Temporal extent: current for Between November 2013-February 2015
Geographic coverage:J4M8 Distribution Park, Scotland
Geographic bounding box: 55°52′38″N3°39′14″W
Method of data collection: Detailed method is presented in the research paper. In summary, released rare earth tagged fine sediment is sampled across numerous SuDS networks over repeated experiments. The concentration of suspended and deposited tagged sediment at multiple locations, over multiple rainfall-runoff events, is recorded over the period of 1 year.
Provenance/lineage:
Subject keywords: sustainable urban drainage; vegetated swale; rare earth tracing; REO;
trapping efficiency; detention; urban pollution treatment; impervious/vegetation boundary influence; first order decay; blue-green drainage network
JACS classification: Environmental Engineering
Library of Congress classification: Environmental Engineering
Publication date: 4 March 2015
Publisher: Heriot-Watt University
Parent Project: Blue-Green Cities Research Project
Related resources:
Legal and ethical issues:none
Copyright:Heriot-Watt University
Publisher:Heriot-Watt University
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