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Impact of Wind on Stormwater Pond Particulate Removal

Impact of Wind on Stormwater Pond Particulate Removal

Titill: Impact of Wind on Stormwater Pond Particulate Removal
Höfundur: Andradóttir, Hrund Ólöf
Útgáfa: 2017-08
Tungumál: Enska
Umfang: 04017027
Háskóli/Stofnun: Háskóli Íslands
University of Iceland
Svið: Verkfræði- og náttúruvísindasvið (HÍ)
School of Engineering and Natural Sciences (UI)
Deild: Umhverfis- og byggingarverkfræðideild (HÍ)
Faculty of Civil and Environmental Engineering (UI)
Birtist í: Journal of Environmental Engineering;143(8)
ISSN: 0733-9372
1943-7870 (eISSN)
DOI: https://doi.org/10.1061/(ASCE)EE.1943-7870.0001221
Efnisorð: Particle size; Resuspension; Settling; Short-circuiting; Stormwater pond; Treatment efficiency; Wash loads; Wind mixing; Tjarnir; Umhverfisverkfræði; Vindar
URI: https://hdl.handle.net/20.500.11815/581

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Andradóttir, H. Ó. (2017). Impact of Wind on Stormwater Pond Particulate Removal. Journal of Environmental Engineering, 143(8), 04017027. doi:doi:10.1061/(ASCE)EE.1943-7870.0001221


Stormwater ponds provide cost and space-efficient treatment of urban runoff via gravitational settling. The goal of this paper was to quantify different mechanisms by which wind can affect the particle removal efficiency of a shallow retention pond. An analytical bulk model was developed and validated numerically against total suspended solids (TSS) measurements in a small (0.3 ha), optimally designed oval pond during four runoff events with 7–11  m/s winds. Simulations highlighted wind as an effective mixing mechanism, lowering the removal of medium silt particles by 10–20% from ideal plug flow, and severely constraining the removal of small clay and silt particles (<6  μm). Initial background concentrations of <12  mg/L TSS were positively correlated with wind speed 5 h prior to the event, indicative of localized wind resuspension. A widespread remobilization of bed sediments was found unlikely in a 1.7-m deep, 112-m fetch pond. A stirred reactor with 60% effective volume is proposed as a first order tool to assess the treatment performance of ideally structured ponds in areas with strong, unobstructed winds.


This work is made available under the terms of the Creative Commons Attribution 4.0 International license, http://creativecommons.org/licenses/by/4.0/


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