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Mietto, Anna
Publications (3 of 3) Show all publications
Bodin, H., Mietto, A., Ehde, P. M., Persson, J. & Weisner, S. (2012). Tracer behaviour and analysis of hydraulics in experimental free water surface wetlands. Ecological Engineering: The Journal of Ecotechnology, 49, 201-211
Open this publication in new window or tab >>Tracer behaviour and analysis of hydraulics in experimental free water surface wetlands
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2012 (English)In: Ecological Engineering: The Journal of Ecotechnology, ISSN 0925-8574, E-ISSN 1872-6992, Vol. 49, p. 201-211Article in journal (Refereed) Published
Abstract [en]

Effects of inlet design and vegetation type on tracer dynamics and hydraulic performance were investigated using lithium chloride in 18 experimental free water surface wetlands. The wetlands received similar water flow but had different vegetation types: 6 emergent vegetation wetlands (EVWs), 6 submerged vegetation wetlands (SVWs) and 6 free development wetlands (FDWs). Two types of inlet designs were applied: half of each wetland vegetation type had a barrier near the inlet to help distribute incoming tracer solution, while the rest had no barrier. Residence time distribution (RTD) functions were calculated from tracer data using two techniques: method of moments and a novel Gauss modelling approach. RTD functions were used to quantify hydraulic parameters: active wetland volume (e-value), water dispersion (N-value) and hydraulic efficiency (lambda-value). For wetlands without barrier, significantly lower tracer mass recoveries were found from EVWs compared to FDWs and SVWs, signifying a risk of tracer methodological problems in small densely vegetated wetlands. These problems were minimized in wetlands with an inflow construction promoting distribution of incoming tracer solution. Compared to the method of moments, Gauss modelling seemed to produce more reliable lambda-values but less reliable N-values. Data for precise hydraulic quantification were lost by Gauss modelling, as indicated by overall lower variance in these data sets and lower mass recoveries. However, Gauss modelling may minimize uncertainties associated with lithium immobilization/mobilization. Parameters were significantly affected by the RTD data analysis method, showing that the choice of method could affect evaluation of wetland hydraulics. The experimental wetlands in this study exhibited relatively high e-values and low N-values. This was probably caused by the small size of the wetlands and low water flow velocities, emphasizing that hydraulic parameter values obtained in small experimental wetlands may not be applicable to hydraulics in larger wetlands. The method of moments revealed lower e-values from EVWs compared to SVWs and FDWs. It was indicated that lower e-values were mainly caused by vegetation volumes. This highlighted a need for regular maintenance to secure efficient treatment volume in wetlands with dense vegetation. © 2012 Elsevier B.V.

Place, publisher, year, edition, pages
Amsterdam: Elsevier, 2012
Keywords
Data analysis, Free water surface wetlands, Gauss modelling, Hydraulic performance, Inlet, Lithium tracer, Vegetation
National Category
Environmental Sciences
Identifiers
urn:nbn:se:hh:diva-19582 (URN)10.1016/j.ecoleng.2012.07.009 (DOI)000320931100029 ()2-s2.0-84868624908 (Scopus ID)
Available from: 2012-09-12 Created: 2012-09-12 Last updated: 2018-03-22Bibliographically approved
Mietto, A. (2010). Phytoremediation Efficiency: Assessment of Removal Processes and Hydraulic Performance in Constructed Wetlands. (Doctoral dissertation). Venice: Università Ca’ Foscari di Venezia
Open this publication in new window or tab >>Phytoremediation Efficiency: Assessment of Removal Processes and Hydraulic Performance in Constructed Wetlands
2010 (English)Doctoral thesis, monograph (Other academic)
Place, publisher, year, edition, pages
Venice: Università Ca’ Foscari di Venezia, 2010. p. 168
Identifiers
urn:nbn:se:hh:diva-6017 (URN)
Supervisors
Note

FD miljövetenskap, Våtmarkscentrum

Available from: 2010-10-06 Created: 2010-09-28 Last updated: 2018-03-23Bibliographically approved
Weisner, S., Mietto, A., Ehde, P. M. & Persson, J. (2009). Influence of vegetation on hydraulics in experimental surface-flow wetlands. In: Josep M. Bayona & Joan García (Ed.), 3rd Wetland Pollutant Dynamics and Control - WETPOL 2009 - Barcelona. Paper presented at 3rd International Symposium on Wetland Pollutant Dynamics and Control - WETPOL 2009, Barcelona, Spain (pp. 179-180).
Open this publication in new window or tab >>Influence of vegetation on hydraulics in experimental surface-flow wetlands
2009 (English)In: 3rd Wetland Pollutant Dynamics and Control - WETPOL 2009 - Barcelona / [ed] Josep M. Bayona & Joan García, 2009, p. 179-180Conference paper, Published paper (Refereed)
National Category
Natural Sciences
Identifiers
urn:nbn:se:hh:diva-5995 (URN)978-84-692-5587-2 (ISBN)
Conference
3rd International Symposium on Wetland Pollutant Dynamics and Control - WETPOL 2009, Barcelona, Spain
Available from: 2010-09-27 Created: 2010-09-24 Last updated: 2018-03-23Bibliographically approved

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