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Artykuły w czasopismach na temat "Changements climatiques – Rhin (cours d'eau)"
Thirel, Guillaume, Kai Gerlinger, Charles Perrin, Gilles Drogue, Benjamin Renard i Jean-Pierre Wagner. "Quels futurs possibles pour les débits des affluents français du Rhin (Moselle, Sarre, Ill) ?" La Houille Blanche, nr 5-6 (grudzień 2019): 140–49. http://dx.doi.org/10.1051/lhb/2019039.
Pełny tekst źródłaSaha, Fréderic, Mesmin Tchindjang, Jean-Guy Dzana i Djasrabé Nguemadjita. "Dynamique des extrêmes hydrologiques du système Chari-Logone et risques naturels dans la région de l'extrême-nord du Cameroun". Proceedings of the International Association of Hydrological Sciences 384 (16.11.2021): 241–46. http://dx.doi.org/10.5194/piahs-384-241-2021.
Pełny tekst źródłaNaranjo, José A., i Roland P. Paskoff. "Volcanisme, tectonique et réseau hydrographique sur le piémont andin du désert du nord du Chili". Géographie physique et Quaternaire 38, nr 2 (29.11.2007): 201–4. http://dx.doi.org/10.7202/032553ar.
Pełny tekst źródłaAntoine, Pierre. "Modifications des systèmes fluviatiles à la transition Pléniglaciaire-Tardiglaciaire et à l’Holocène : l’exemple du bassin de la Somme (Nord de la France)". Géographie physique et Quaternaire 51, nr 1 (2.10.2002): 93–106. http://dx.doi.org/10.7202/004763ar.
Pełny tekst źródłaRozprawy doktorskie na temat "Changements climatiques – Rhin (cours d'eau)"
Thierion, Charlotte. "Modélisation du fonctionnement de l'aquifère alluvial du fossé rhénan supérieur, vulnérabilité sous l'impact du changement climatique". Phd thesis, École Nationale Supérieure des Mines de Paris, 2011. http://pastel.archives-ouvertes.fr/pastel-00667218.
Pełny tekst źródłaHatin, Tristan. "Réponse de la productivité diatomique aux changements climatiques et océanographiques au niveau du système turbiditique du Congo au cours du dernier million d'années". Thesis, Brest, 2016. http://www.theses.fr/2016BRES0056/document.
Pełny tekst źródłaTo precise the evolution of the Congo deep sea fan (western African margin, eastern tropical South Atlantic), and the paleoclimatic and paleoceanographic conditions of the zone during the last million years, variations of diatom productivity have been studied on two reference cores, KZAI-02 and RZCS-26, located respectively at 240 and 800 Kms of the Congo river mouth. This study is part of the REPREZAI project, REtrogradation/PRogradation in the ZAÏre deep-sea fan. High diatom accumulation rates were registered during the mid-part of MIS 6, the cold substage MIS 5d and the MIS 3-2, sustained essentially via nutrients, including dissolved silica, injected by the Congo River into the ocean. Low diatom accumulation rates were recorded during the early and late MIS 6, the MIS 5e, the early MIS 4 and the Holocene, when the terrigenous load in surface waters prevent a strong productivity. Further offshore, a substantial dissolved silica input by the discharges of the Congo river, but also a low consumption of this nutrient upstream, are required to have a strong productivity. The intensification of oceanic upwelling conditions also favors the siliceous productivity. The increasing influence of fluvial discharges, marked by a greater abundance of brackish diatoms off the mouth, corresponds fairly well to the establishment of the axial edifice of the Congo deep sea fan around ~ 230 ka BP. Two exploratory studies were conducted in complement: The study of morphometric variability of the diatom species Fragilariopsis doliolus, that highlighted important variation of the valvar surface during the Quaternary; the study of the silica isotopes that proved to be complex, because of important mix of biogenic and lithogenic silica in the samples
Lenormand, Frédéric. "Utilisation de la glace de lac comme indicateur de variabilité et de changements climatiques dans le Nord du Canada : développement d'une base de données et étude de cas". Thesis, Université Laval, 2005. http://www.theses.ulaval.ca/2005/22952/22952.pdf.
Pełny tekst źródłaRoyer-Gaspard, Paul. "De la robustesse des modèles hydrologiques face à des conditions climatiques variables". Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS466.
Pełny tekst źródłaAmong the many challenges that climate change poses, the ability of hydrological models to adequately perform over a large range of climatic conditions is key its impacts on the regime of rivers. However, modern hydrological models still lack of robustness. The causes are yet uncertain and may be manifold: (calibration, measurement errors, model structure). This thesis aims at identifying solutions for model improvement by a series of diagnoses conducted on a large catchment set. After a study of the types of climatic changes challenging model robustness the most, we set up a comparison of different calibration methods. It revealed that the choice of the optimized objective function had a significant impact on model robustness. The way potential evaporation is computed also influences model robustness, although our comparison of a few potential evaporation models show rather heterogeneous results across the catchment set. A method specifically designed to diagnose structural weaknesses impacting model robustness, based on an analysis of performance trade-offs in a multi-objective framework, was then proposed and applied to the GR4J model. A couple of major structural deficiencies was identified. These deficiencies likely prevent the model from providing robust simulations in different streamflow ranges simultaneously. An attempt to modify the structure of GR4J yielded to an encouraging yet modest improvement of its performance. Despite the light enhancement of hydrological model robustness achieved in this work, it may pave the way to further advances toward model structural development
Rossi, Aurélien. "Analyse spatio-temporelle de la variabilité hydrologique du bassin versant du Mississippi : rôles des fluctuations climatiques et déduction de l'impact des modifications du milieu physique". Rouen, 2010. http://www.theses.fr/2010ROUES013.
Pełny tekst źródłaGreat River watersheds, as the Mississippi River in North America, integrate climate and environmental changes (climate fluctuations, precipitations, streamflow, sediment loads) at near-continent scale, as well as anthropogenic changes in physical environment (land uses, river management. . . ) in their hydrologic response, which makes sometimes difficult the identification of linkages between hydrological and climate variability. The main objectives of this work is to determine and quantify the relationships between hydrological variability and climate fluctuations (regionalized precipitations, climate indices) of the Mississippi River and its main tributaries, using spectral approaches adapted to (the study of non-stationary processes (continuous wavelet transform, wavelet coherence). Hydrological variability of the Mississippi River and its main tributaries is structured by several scales of variability, from annual to inter-annual (2-4y, 3-6y, 5-8y), decadal (8-16y, 12-16y) and multi-decadal scales (22y, 22-26y). These modes of streamflow variability are very similar to those observed in regionalized precipitations (mean coherency is estimated from 77% to 89% according to the sub-watershed), and operates at same time-scales variability of the main climate fluctuations affecting this region (ENSO, PDO, AMO, NAO, NAM et PNA), preliminary identified and synthesized using an similar methodology. Streamflow variability of the Mississippi River watershed appears influenced by several teleconnections (mean coherency of 63% to 66% with all climate indices), which operate at different spatial and temporal scales and change across time. Furthermore and not surprisingly, the hydrological variability of the Mississippi River and its main tributaries appears to be closely linked to a major shift in the climate system – as well as many other hydrosystems around the world – observed at global scale around 1970. This change would result in an increase in both streamflow mean and variance, as highlighted by changes in the spectral content of climate and hydrological parameters. In this way, a so-called "hydro-climatic" index was proposed in order to resume all those characteristics of the climate system that would imprint the typical scales of variability detected in the hydrological processes analyzed according to each sub-watershed. Finally, even if the majority of hydrological parameters appears strongly affected by climate parameters, others factors such as changes in physical environment (land use, river management. . . ) could also significantly influence hydrological parameters (e. G. Low and high streamflow). We could detect such human-induced changes in the variability of suspended sediment loads and show that it involved a decrease in suspended sediment loads up to 2,25. 108 metric t. Y-1 between 1950 and 1975 using a spectral modelling approach. However, the influence of these physical environmental changes in hydrology would be associated to trends or to very localized changes in space and time, rather than associated to the existence of oscillations in hydrological parameters as we could detect them. We then conclude that, despite the potential strong influence of environmental changes, climate fluctuations remain the main factor involved in the observed hydrological changes
Blouin, Sébastien. "Impact de la variabilité climatique récente (1970-2002) sur le débit des rivières alimentant en eau la grande région de Québec". Thesis, Université Laval, 2006. http://www.theses.ulaval.ca/2006/23854/23854.pdf.
Pełny tekst źródłaMassuel, Sylvain. "Évolution récente de la ressource en eau consécutive aux changements climatiques et environnementaux du sud-ouest du Niger : modélisation des eaux de surface et souterraines du bassin du kori de Dantiandou sur la période 1992-2003". Montpellier 2, 2005. http://www.theses.fr/2005MON20093.
Pełny tekst źródłaBresciani, Etienne. "Modélisation des contrôles climatiques, topographiques, géologiques et anthropiques sur les écoulements souterrains en domaine de socle". Phd thesis, Université Rennes 1, 2011. http://tel.archives-ouvertes.fr/tel-00734265.
Pełny tekst źródłaKuentz, Anna. "Un siècle de variabilité hydro-climatique sur le bassin de la Durance : Recherches historiques et reconstitutions". Electronic Thesis or Diss., Paris, AgroParisTech, 2013. http://www.theses.fr/2013AGPT0047.
Pełny tekst źródłaUnderstanding and predicting hydrological variability is becoming a major issue to improve water resources management at the watershed scale, as climate variability and multipurpose use of water increase stress on the available resources. In France, the Durance watershed (South part of the Alps) is both characterised by numerous water-related activities such as hydropower, irrigation, water supply, tourism, and by a wide range of meteorological contexts ranging from mountainous to dry Mediterranean watersheds. As a consequence, this watershed appears as very sensitive to observed and projected climate variability, with an impact on water resources sufficient to question the current balance between users. In order to better forecast the Durance watershed hydrological variability, tracing back its past evolution is an essential step. Indeed, historical knowledge provides a better understanding of how the watershed works, and put into perspective hydro meteorological projections for the next century. The main goal of this Ph.D. thesis is then to improve our knowledge of the hydrological variability of the Durance watershed over the last century. Two main themes have been developed.The first step focused on historical research, bringing to light 11 centennial time-series of daily streamflow on the Durance watershed. Those data were quite well documented, allowing us to follow the evolution of the methods used to construct some of those time-series. Based on recent streamflow time-series, a simulation process allowed us to quantify the uncertainty associated to the methods used in the past, and to highlight the significant biases they carried on some periods of time. A correction process was then developed, leading to the partial revision of some of the time-series. A second step involved reconstructing hydrological time-series at different points of the watershed. An original method, called ANATEM, has been introduced and exhaustively applied to rebuild climatological time-series at the watershed scale. This method is based on the use of large scale climatological variables (atmospheric pressure fields) combined with regional scale observations (observed precipitation or air temperature). Those reconstructed climatological time-series were then prescribed in a rainfall-runoff model, allowing the computation of hydrological simulations on the 1884-2010 period. The comparison of the simulated data with our 11 centennial observed time series allowed us to validate our hydro-climatological reconstruction chain over more than a century. Finally, the observed and simulated time-series illustrate the climatological and hydrological variability of the Durance watershed. This variability is characterised by the succession of alternatively dry and humid periods lasting for ten to fifteen years, and by a slight trend to streamflow decrease. These long-term hydrological time-series will then put into perspective future investigations on water resources available over the next century
Magand, Claire. "Influence de la représentation des processus nivaux sur l'hydrologie de la Durance et sa réponse au changement climatique". Electronic Thesis or Diss., Paris 6, 2014. http://www.theses.fr/2014PA066398.
Pełny tekst źródłaThe Durance watershed, located in the French Alps, generates 10% of French hydropower and provides drinking water to about 3 million people. The upstream part of this catchment, where snowfall accounts for more than 50% of the precipitation, is responsible for almost half of the total runoff whereas it accounts for only 25% of the area. To assess the impacts of climate change on the water resources, hydrological models are now commonly used. The snow cover is, however, difficult to simulate because it is highly variable in both space and time. Therefore, special attention has been given to understanding the snow processes in this alpine environment, and to their representation in a land surface model, the CLSM. The analysis of snow-cover extent and height observations has lead us to modify the snow scheme of the CLSM, by introducing a hysteresis in the snow depletion curve. Then, we quantified the possible evolution of the Durance hydrosystem using 330 climate change scenarios. The results of the CLSM are compared with those of five other hydrological models. All models are in agreement in predicting a significant reduction of discharge with some different modifications of the hydrological regime depending on the different zones of the catchment. Uncertainties remain important concerning the magnitude of discharge changes, mainly due to the climatic scenarios. The uncertainty related to hydrological modelling is indeed low but varies depending on the season. This highlights some of the difficulties in using hydrological models to correctly represent snow processes and evapotranspiration processes especially under water stress
Książki na temat "Changements climatiques – Rhin (cours d'eau)"
Sircoulon, Jacques. Impact possible des changements climatiques a venir sur les ressources en eau des regions arides et semi-arides: Comportement des cours d'eau tropicaux, des rivières et des lacs en zone sahélienne. [Paris]: Organisation Meteorologique Mondiale, 1990.
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