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Article: Interactions between shallow groundwater and low-impact development underdrain flow at different temporal scales

TitleInteractions between shallow groundwater and low-impact development underdrain flow at different temporal scales
Authors
Keywordsempirical equations
groundwater
low‐impact development
storm
water temporal scales
Issue Date2018
PublisherJohn Wiley & Sons Ltd. The Journal's web site is located at http://www3.interscience.wiley.com/cgi-bin/jhome/4125
Citation
Hydrological Processes, 2018, v. 32 n. 23, p. 3495-3512 How to Cite?
AbstractLow‐impact development (LID) practices are effective in managing surface run‐off, mitigating nonpoint source pollution, and recharging groundwater. However, they are often less effective in shallow groundwater environments as their surface infiltration and bottom exfiltration rates could be reduced, and the underdrains (i.e., underground drains within the media of the LID practices) may drain groundwater and alter groundwater dynamics. To evaluate and better understand the interactions between shallow groundwater and LID underdrain flow at different temporal scales, multiple statistical analyses were conducted on the monitored groundwater table depth and underdrain flow of porous pavements at the Central Kitsap Community Campus (Washington) and both porous pavements and bioretention cells at the IMAX parking lot (Ontario, Canada). The wavelet power, which represents oscillation behaviour and is obtained by continuous wavelet transform, of underdrain flow was a hybrid of that of rainfall and groundwater table depth. Rainfall variations at finer temporal scales (5 min to 10 days) resulted in finer scale underdrain flow, whereas groundwater fluctuations at coarser temporal scales (10 to 30 days) accounted for coarser scale underdrain flow and extended the duration of it. The impact of groundwater on underdrain flow was greater when the groundwater table was shallower than the underdrain (e.g., <0.6 m), particularly at finer temporal resolutions (5 min to 1 hr), which correspond to short‐term responses of LID practices and their corresponding effects on flooding. It was possible that the local groundwater mounds formed by infiltrated water instead of regional groundwater fluctuations that affected the underdrain flow in these conditions. Finally, through an evolutionary polynomial regression, two simple equations were obtained to predict the total amount and peak of LID underdrain flow using event‐based rainfall, groundwater table depth, and the hydraulic conductivity of media and in situ soils. The results may facilitate LID design and planning, and their implementation in shallow groundwater areas. The derived equations may benefit the real‐time control of LID‐related sewer and treatment systems in shallow groundwater urban catchments.
Persistent Identifierhttp://hdl.handle.net/10722/275707
ISSN
2017 Impact Factor: 3.181
2015 SCImago Journal Rankings: 1.419

 

DC FieldValueLanguage
dc.contributor.authorZHANG, K-
dc.contributor.authorChui, TFM-
dc.date.accessioned2019-09-10T02:48:01Z-
dc.date.available2019-09-10T02:48:01Z-
dc.date.issued2018-
dc.identifier.citationHydrological Processes, 2018, v. 32 n. 23, p. 3495-3512-
dc.identifier.issn0885-6087-
dc.identifier.urihttp://hdl.handle.net/10722/275707-
dc.description.abstractLow‐impact development (LID) practices are effective in managing surface run‐off, mitigating nonpoint source pollution, and recharging groundwater. However, they are often less effective in shallow groundwater environments as their surface infiltration and bottom exfiltration rates could be reduced, and the underdrains (i.e., underground drains within the media of the LID practices) may drain groundwater and alter groundwater dynamics. To evaluate and better understand the interactions between shallow groundwater and LID underdrain flow at different temporal scales, multiple statistical analyses were conducted on the monitored groundwater table depth and underdrain flow of porous pavements at the Central Kitsap Community Campus (Washington) and both porous pavements and bioretention cells at the IMAX parking lot (Ontario, Canada). The wavelet power, which represents oscillation behaviour and is obtained by continuous wavelet transform, of underdrain flow was a hybrid of that of rainfall and groundwater table depth. Rainfall variations at finer temporal scales (5 min to 10 days) resulted in finer scale underdrain flow, whereas groundwater fluctuations at coarser temporal scales (10 to 30 days) accounted for coarser scale underdrain flow and extended the duration of it. The impact of groundwater on underdrain flow was greater when the groundwater table was shallower than the underdrain (e.g., <0.6 m), particularly at finer temporal resolutions (5 min to 1 hr), which correspond to short‐term responses of LID practices and their corresponding effects on flooding. It was possible that the local groundwater mounds formed by infiltrated water instead of regional groundwater fluctuations that affected the underdrain flow in these conditions. Finally, through an evolutionary polynomial regression, two simple equations were obtained to predict the total amount and peak of LID underdrain flow using event‐based rainfall, groundwater table depth, and the hydraulic conductivity of media and in situ soils. The results may facilitate LID design and planning, and their implementation in shallow groundwater areas. The derived equations may benefit the real‐time control of LID‐related sewer and treatment systems in shallow groundwater urban catchments.-
dc.languageeng-
dc.publisherJohn Wiley & Sons Ltd. The Journal's web site is located at http://www3.interscience.wiley.com/cgi-bin/jhome/4125-
dc.relation.ispartofHydrological Processes-
dc.rightsPreprint This is the pre-peer reviewed version of the following article: [FULL CITE], which has been published in final form at [Link to final article using the DOI]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. Postprint This is the peer reviewed version of the following article: [FULL CITE], which has been published in final form at [Link to final article using the DOI]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.-
dc.subjectempirical equations-
dc.subjectgroundwater-
dc.subjectlow‐impact development-
dc.subjectstorm-
dc.subjectwater temporal scales-
dc.titleInteractions between shallow groundwater and low-impact development underdrain flow at different temporal scales-
dc.typeArticle-
dc.identifier.emailChui, TFM: maychui@hku.hk-
dc.identifier.authorityChui, TFM=rp01696-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/hyp.13272-
dc.identifier.scopuseid_2-s2.0-85054176442-
dc.identifier.hkuros304844-
dc.identifier.volume32-
dc.identifier.issue23-
dc.identifier.spage3495-
dc.identifier.epage3512-
dc.publisher.placeUnited Kingdom-

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