Coupling hydraulic and biological measurements highlights the key influence of algal biofilm on infiltration basin performance

  • Gette-Bouvarot M
  • Mermillod-Blondin F
  • Angulo-Jaramillo R
 et al. 
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Abstract

Infiltration basins are increasingly used in urban areas for flood protection, groundwater recharge and storm water disposal. However, their operation is often affected by clogging, leading to degraded infiltration. The aim of this work was to evaluate the respective influences of sediment deposition and biofilm biomass on the deterioration of hydraulic performances in two infiltration basins used for groundwater recharge. Samples were collected by coring in the two basins. Grain size distribution (with and without organic matter), bacterial and algal biomasses, and microbial activity were measured at three depths from the soil surface (0–1 cm, 2–3 cm and 10–14 cm). In parallel, in situ single-ring infiltration tests were performed before and after removal of the top layer (0–1 cm). The results showed considerably reduced permeability due to clogging of the top sedimentary layer in the two basins. The highest reduction of permeability was measured in the basin colonized by the largest algal biomass. The proportions of fine mineral particles (

Author-supplied keywords

  • Algae
  • Beerkan infiltration
  • Biofilm
  • Clogging
  • Hydraulically functional pore size
  • Infiltration basin
  • Particle size distribution
  • Saturated hydraulic conductivity

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Authors

  • Florian Mermillod-BlondinEcology of Fluvial Hydrosystems

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  • Morgane Gette-Bouvarot

  • Rafael Angulo-Jaramillo

  • C??cile Delolme

  • Damien Lemoine

  • Laurent Lassabatere

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