Baures（eの頭に｀）,E., Depla,I., Merel,S., Thomas,M.-F., Jung,A.-V. and Thomas,O.(2013): Variation of organic carbon and nitrate with river flow within an oceanic regime in a rural area and potential impacts for drinking water production. Journal of Hydrology, 477, 86-93.

『農村地域で海洋域を伴う河川流内の有機炭素と硝酸塩の変動および飲料水生産への潜在的影響』

『Abstract
　Over the last two decades, climate change has become a major environmental and public health concern due to the increase of the mean temperature on the Earth and its consequences on extreme meteorological events such as floods and droughts. These events induce very low or very high river flows that may impair surface water quality, and therefore results in potential health impacts when used for drinking water production. The present study aims at assessing the impact of hydrologic regime on surface water quality with a particular emphasis on total organic carbon (TOC) and nitrate. Water quality data from three French rivers acquired over a 27 years period, from January 1983 to December 2009, show the influence of extreme flows. Variation in TOC and nitrate concentrations showed opposite patterns for the whole range of flow rate (from less than 10％ up to more than 100％ of the mean flow). Regarding fluxes, TOC increased continuously with flow rate while nitrate was stable for very high discharges. The C/N ratio expressed from TOC and nitrate concentrations showed high values for extreme flows and particularly for very low flow rates, generally, in summer, where nitrate is assimilated by biomass. Considering TOC and nitrate fluxes, it is confirmed that the worst situations were encountered for very high flow rates, namely for TOC exportation during surface runoff which was related to heavy rains or floods. These findings are of great importance with regard to the adaptation for drinking water treatment in facing extreme hydrological conditions, of which the frequency is increasing with climate change.

Keywords: Resource water quality; Data analysis; Weather events; Climate change』

1. Introduction
2. Material and methods
　2.1. Description of the experimental field
　2.2. Raw data
　2.3. Data pre-treatment
3. Results and discussion
　3.1. Variation of organic carbon and nitrate with river flow
　3.2. Distribution of organic carbon and nitrate according to river flow
　3.3. Variation of TOC and nitrate fluxes with flow rate
　3.4. Variation of organic carbon-nitrate relationship with river flow
4. Discussion
　4.1. C/N variation
　4.2. Towards a generalization
　4.3. Impact on small scale water services
　4.4. Hydrological limits for monitoring relevance
5. Conclusion
Acknowledgements
References

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