Title: | Impact of Wind on Stormwater Pond Particulate Removal |
Author: | |
Date: | 2017-08 |
Language: | English |
Scope: | 04017027 |
University/Institute: | Háskóli Íslands University of Iceland |
School: | Verkfræði- og náttúruvísindasvið (HÍ) School of Engineering and Natural Sciences (UI) |
Department: | Umhverfis- og byggingarverkfræðideild (HÍ) Faculty of Civil and Environmental Engineering (UI) |
Series: | Journal of Environmental Engineering;143(8) |
ISSN: | 0733-9372 1943-7870 (eISSN) |
DOI: | https://doi.org/10.1061/(ASCE)EE.1943-7870.0001221 |
Subject: | 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 |
Citation: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
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Abstract: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.
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Rights: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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