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Connecting bacterial colonization to physical and biochemical changes in a sand box infiltration experiment

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10.1016/j.jhydrol.2014.05.041
 
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Rubol, Simonetta
Freixa, Anna
Carles Brangari, Albert
Fernández García, DanielMés informacióMés informacióMés informació
Romani Cornet, Anna Maria
Sánchez Vila, Francisco JavierMés informacióMés informacióMés informació
Document typeArticle
Defense date2014-09-19
PublisherElsevier
Rights accessRestricted access - publisher's policy
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
ProjectTRENTINO - The research, training and mobility programme in Trentino (EC-FP7-226070)
Abstract
Infiltration through sediments is linked to complex biogeochemical processes occurring at small spatial scales, often leading to a progressive reduction in infiltration rates due to microbial growth and/or mechanical clogging. Unraveling the linkage between microbial dynamics and water infiltration in a heterogeneous medium is of concern in artificial recharge ponds and natural infiltration systems. We present an 84-day laboratory infiltration experiment that aims at studying the temporal variation of selected biogeochemical parameters at different depths along the infiltration path. The experimental setup consists of a 1.2 m high tank packed with a heterogeneous soil and instrumented with arrays of sensors as well as soil and liquid samplers. Results indicate that: (i) microbial processes are responsible for infiltration reduction, enhancing the spatially heterogeneous distribution of infiltration rates with time, (ii) bacteria and extracellular polymeric substances (EPS) are present at all monitored depths, indicating the potential for deep biological clogging, (iii) bacteria functioning and richness exhibit depth zonation after the system reaches a mature state and (iv) the retention curve changes towards highest saturation by the end of the experiment. The increase in water holding capacity is largest at depth, where the presence of EPS is noticeable. The reduction in time of the quantity of water infiltrating along the tank can only be accounted for with a truly interdisciplinary approach involving physical, chemical and biological processes
CitationRubol, S. [et al.]. Connecting bacterial colonization to physical and biochemical changes in a sand box infiltration experiment. "Journal of hydrology", 19 Setembre 2014, vol. 517, p. 317-327. 
URIhttp://hdl.handle.net/2117/24255
DOI10.1016/j.jhydrol.2014.05.041
ISSN0022-1694
Publisher versionhttp://www.sciencedirect.com/science/article/pii/S0022169414004053
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  • Departament d'Enginyeria del Terreny, Cartogràfica i Geofísica (fins octubre 2015) - Articles de revista [239]
  • GHS - Grup d'Hidrologia Subterrània - Articles de revista [232]
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