1000 resultados para Aulard, François-Alphonse (1849-1928) -- Portraits
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Mode of access: Internet.
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In the late 19th century, F.A. FOREL led investigations of the Rhone River delta area of Lake Geneva that resulted in the dis- covery of a textbook example of a river-fed delta system containing impressive subaquatic channels. Well ahead of the marine counterparts, scientific observations and interpretations of water currents shaping the delta edifice for the first time documented how underflow currents carry cold, suspension-laden waters from the river mouth all the way to the deep basin. These early investigations of the Rhone delta laid the basis for follow-up studies in the 20th and 21th centuries. Sediment coring, water-column measurements, manned submersible diving, seismic reflection profiling and bathymetric sur- veying eventually provided a rich database to unravel the key erosional and depositional processes, further documenting the impact of human-induced changes in the catchment. With the merging of old and new scientific knowledge, today a comprehensive understanding prevails of how a delta changes through time, how its channels are formed, and what potential natural hazards may be related to its evolution. New and efficient bathymetric techniques, paired with novel coring operations, provided a time-series of morphologic evolution showing and quantifying the high dynamics of the delta/channel evolution in an unprecedented temporal and spatial reso- lution. Future investigations will continue to further quantify these dynamic processes and to link the evolution of the subaquatic domain with changes and processes in the catchment and with natural hazards. Its size, easy access, and large variety of states and processes will continue to make the Rhone delta area a perfect ‘laboratory’ in which general processes can be studied that could be upscaled or downscaled to other marine and lacustrine deltas.
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v. 1. The Revolution under the monarchy, 1789-1792 -- v. 2. The democratic republic, 1792-1795 -- v. 3. The revolutionary government, 1793-1797 -- v. 4. The bourgeois republic and the Consulate, 1797-1804.
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t. 1. Du 18 brumaire an VIII au 30 brumaire an IX (9 novembre 1799-21 novembre 1800)--t. 2. Du 1er frimaire an IX au 30 germinal an X (22 novembre 1800-20 avril 1802)--t. 3. Du 1er floréal an X au 27 germinal an XI (21 avril 1802-17 avril 1803)--t. 4. Du 28 germinal an XI au 27 floréal an XII (18 avril 1803-17 mai 1804)
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Mode of access: Internet.