Use of fallout radionuclides (7Be, 210Pb) to estimate resuspension of Escherichia coli from streambed sediments during floods in a tropical montane catchment

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• 作者：Olivier Ribolzi ; Olivier Evrard…
• 关键词：FIB ; South East Asia ; Hydrological modelling ; Erosion ; Land use ; Overland flow ; Beryllium ; 7 ; Lead ; 210
• 刊名：Environmental Science and Pollution Research
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：23
• 期：4
• 页码：3427-3435
• 全文大小：788 KB
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• 作者单位：Olivier Ribolzi (1)
  Olivier Evrard (2)
  Sylvain Huon (3)
  Emma Rochelle-Newall (4)
  Thierry Henri-des-Tureaux (4)
  Norbert Silvera (5)
  Chanthamousone Thammahacksac (5)
  Oloth Sengtaheuanghoung (6)
  
  1. Géosciences Environnement Toulouse (GET), UMR 5563 (CNRS-UPS-IRD), 14 avenue Edouard Belin, 31400, Toulouse, France
  2. Laboratoire des Sciences du Climat et de l’Environnement (LSCE), UMR 8212 (CEA-CNRS-UVSQ/IPSL), Domaine du CNRS, avenue de la Terrasse, 91198, Gif-sur-Yvette cedex, France
  3. Université Pierre et Marie Curie (UPMC), UMR 7618 iEES (UPMC-CNRS-IRD-INRA-UDD-UPEC), case 120, 4 place Jussieu, 75252, Paris cedex, France
  4. Institut de Recherche pour le Développement (IRD), iEES-Paris, UMR 242, 32, avenue Henri Varagnat, 93143, Bondy cedex, France
  5. IRD, National Agriculture and Forestry Research Institute (NAFRI), P.O. Box 4199, Ban Nogviengkham, Xaythany District, Vientiane, Lao People’s Democratic Republic
  6. Department of Agricultural Land Management (DALaM), P.O. Box 4199, Ban Nogviengkham, Xaythany District, Vientiane, Lao People’s Democratic Republic
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Atmospheric Protection, Air Quality Control and Air Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Industrial Pollution Prevention
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1614-7499

文摘

Consumption of water polluted by faecal contaminants is responsible for 2 million deaths annually, most of which occur in developing countries without adequate sanitation. In tropical aquatic systems, streambeds can be reservoirs of persistent pathogenic bacteria and high rainfall can lead to contaminated soils entering streams and to the resuspension of sediment-bound microbes in the streambed. Here, we present a novel method using fallout radionuclides (7Be and 210Pb_xs) to estimate the proportions of Escherichia coli, an indicator of faecal contamination, associated with recently eroded soil particles and with the resuspension of streambed sediments. We show that using these radionuclides and hydrograph separations we are able to characterize the proportion of particles originating from highly contaminated soils and that from the resuspension of particle-attached bacteria within the streambed. We also found that although overland flow represented just over one tenth of the total flood volume, it was responsible for more than two thirds of the downstream transfer of E. coli. We propose that data obtained using this method can be used to understand the dynamics of faecal indicator bacteria (FIB) in streams thereby providing information for adapted management plans that reduce the health risks to local populations.