Oxydation de la matière organique dans un système hydrologique karstique alimenté par des pertes fluviales (Loiret, France)oxidation of organic matter in a karstic hydrologic unit supplied through stream sinks (Loiret, france)

Albéric, Patrick; Lepiller, Michel

doi:10.1016/s0043-1354(97)00439-9

Cited by 37 publications

(9 citation statements)

References 14 publications

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“…Although the temperature of the Middle Loire River is influenced mainly by thermal exchanges with the atmosphere, there are two additional heat sources that might diversely influence the thermal regime in the studied reach: A heat flux related to river–groundwater exchanges (Gonzalez, ; Moatar and Gailhard, ) that involves the Beauce aquifer and the Val d'Orleans hydrogeological system (Albéric and Lepiller, ; Albéric, ). This flux is sensitive mostly between Orleans and Blois, and it can then be overlooked at Avoine a priori , as it is far downstream from the groundwater‐fed reach (140 km). The heat supplied by the cooling water from three nuclear plants located upstream from Avoine: St Laurent‐des‐Eaux (140 km upstream), Dampierre (230 km upstream), and Belleville (270 km upstream).…”

Section: Study Sitementioning

confidence: 99%

A multimodel comparison for assessing water temperatures under changing climate conditions via the equilibrium temperature concept: case study of the Middle Loire River, France

et al. 2013

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International audienceThis paper investigates three categories of models that are derived from the equilibrium temperature concept to estimate water temperatures in the Loire River in France and the sensitivity to changes in hydrology and climate. We test the models' individual performances for simulating water temperatures and assess the variability of the thermal responses under the extreme changing climate scenarios that are projected for 2081-2100. We attempt to identify the most reliable models for studying the impact of climate change on river temperature (Tw). Six models are based on a linear relationship between air temperatures (Ta) and equilibrium temperatures (Te), six depend on a logistic relationship, and six rely on the closure of heat budgets. For each category, three approaches that account for the river's thermal exchange coefficient are tested. In addition to air temperatures, an index of day length is incorporated to compute equilibrium temperatures. Each model is analysed in terms of its ability to simulate the seasonal patterns of river temperatures and heat peaks. We found that including the day length as a covariate in regression-based approaches improves the performance in comparison with classical approaches that use only Ta. Moreover, the regression-based models that rely on the logistic relationship between Te and Ta exhibit root mean square errors comparable (0.90 °C) with those obtained with a classical five-term heat budget model (0.82 °C), despite a small number of required forcing variables. In contrast, the regressive models that are based on a linear relationship Te = f(Ta) fail to simulate the heat peaks and are not advisable for climate change studies. The regression-based approaches that are based on a logistic relationship and the heat balance approaches generate notably similar responses to the projected climate changes scenarios. This similarity suggests that sophisticated thermal models are not preferable to cruder ones, which are less time-consuming and require fewer input data

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Section: Study Sitementioning

confidence: 99%

A multimodel comparison for assessing water temperatures under changing climate conditions via the equilibrium temperature concept: case study of the Middle Loire River, France

et al. 2013

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“…According to the high Total Organic Carbon (TOC) contents measured in the soil water situated above the cave, the TOC range observed in the dripwater (0.95-5 mg l −1 , average: 2.23 mg l −1 ) demonstrates that the drip cannot be several years old, at most several months [1,9,10,21].…”

Section: Water Flow Through the Unsaturated Zonementioning

confidence: 99%

Contribution of stable isotopes to the understanding of the unsaturated zone of a carbonate aquifer (Nerja Cave, southern Spain)

Carrasco

Andreo

Liñán³

et al. 2006

Comptes Rendus. Géoscience

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We analysed the stable isotopes ( 18 O and 2 H) of rainwater and drip water within a cave (Nerja Cave) located in the unsaturated zone of a carbonate aquifer. Rainfall is more abundant and presents lower isotopic content in winter, while the volume of drip water is greater and its isotopic content is lower in summer. The flow analysis of 18 O through the unsaturated zone confirms the seasonal lag between rainfall and the appearance of drip water in the cave and reveals that the unsaturated zone of the aquifer, in the sector of the cave, behaves like an inertial system with a strong capability to modulate the input signal.

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“…The higher the stream level, the higher the groundwater level and the larger the spring flow (Sainjon, 1880;Marboutin, 1902;Caudron et al, 1965;Desprez, 1967Desprez, , 1976Chéry, 1983). Moreover, the discharge water at the Bouillon resurgence has been shown to have directly inherited its chemical composition from the River Loire water sampled 3 days before (Albéric and Lepiller, 1998;Albéric, 1998). In addition, since the beginning of 1300s, the course of the river Loiret has been dammed by several causeways built for mill works causing a stepped base level control of the emergence flow in the different basins, and earthworks have progressively moved downstream the confluence between the river Loiret and its tributary Le Dhuy (Fontenu 1736, Sainjon, 1880.…”

Section: Site Description and Sources Of Datamentioning

confidence: 99%

River backflooding into a karst resurgence (Loiret, France)

Albéric

2004

Journal of Hydrology

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The group of springs located in the west part of the Val d'Orléans exemplifies a type of karstic emergence which has the particularity to get most of its recharge water from a single surface water source, which in this particular case is the River Loire. Hence the flow of this group of springs is known to fluctuate in a close relationship with the water level of the River Loire. Since the second half of the 1990s, the conduit of the upstream spring of the Loiret river (so-called Le Bouillon) has been periodically seen to be invaded by the turbid waters of a small surface tributary (Le Dhuy) flowing back from the confluence to the spring, which then functioned as a swallow-hole. Plotted in a Dhuy versus River Loire diagram, stages of backflooding days describe a domain limited by a curve of the form HDhuy ¼ c þ e ðaH Loire þbÞ : The exponential form of the relation corresponds to the increasing resistance of the emerging flow of the spring to the backflooding of the tributary waters, as the River Loire stages rise. The equation above was used to compute a daily backflow index enabling the effective reconstruction of all occurrences effectively counted during the regular period of observation of the spring. Extended to 1985, one can observe that the early 1990s do not appear as a favorable period to backflow events but some may have occurred during the years 1986 to 1989. The observation of rainfall intensity preceding backflooding shows that in a short time span there is no necessity to evoke intrinsic changes inside the Val d'Orléans basin to explain what might appear as a troublesome new phenomenon. In conclusion backflooding has probably existed for a long time and is simply under the control of local heavy rainfall during low River Loire stages. q

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Oxydation de la matière organique dans un système hydrologique karstique alimenté par des pertes fluviales (Loiret, France)oxidation of organic matter in a karstic hydrologic unit supplied through stream sinks (Loiret, france)

Cited by 37 publications

References 14 publications

A multimodel comparison for assessing water temperatures under changing climate conditions via the equilibrium temperature concept: case study of the Middle Loire River, France

A multimodel comparison for assessing water temperatures under changing climate conditions via the equilibrium temperature concept: case study of the Middle Loire River, France

Contribution of stable isotopes to the understanding of the unsaturated zone of a carbonate aquifer (Nerja Cave, southern Spain)

River backflooding into a karst resurgence (Loiret, France)

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