Improvement of grain-size analyses using the automated SEDIGRAPH 5100

The method of analysing fine grained sediments is discussed and an improved technique using a water-glycerol solution of known density instead of water is proposed. Inaccuracies resulting from wet sieving may contribute to explain the observed difference between the pipette method and the Sedigraph 5100 analyses

Применение нейросетевых технологий для измерений параметров вибрации объектов с неплоской поверхностью

Было проведено компьютерное моделирование электродинамической системы интерференционного измерителя параметров вибраций объектов с неплоской поверхностью. Показано, что применение нейросетевых технологий позволяет использовать интерференционный метод для измерения параметров перемещений объектов с неплоской поверхностью. Полученные результаты обработки данных компьютерного моделирования свидетельствуют об эффективности практического применения нейронных сетей для обработки сигналов трёхзондового интерференционного сверхвысокочастотного измерителя.Було проведено комп'ютерне моделювання електродинамічної системи інтерференційного вимірювача параметрів вібрацій об'єктів з неплоскою поверхнею. Показано, що застосування нейромережевих технологій дозволяє використовувати інтерференційний метод для вимірювання параметрів переміщень об'єктів з неплоскою поверхнею. Отримані результати обробки даних комп'ютерного моделювання свідчать про ефективність практичного застосування нейронних мереж для обробки сигналів тризондового інтерференційного надвисокочастотного вимірювача.An electrodynamical system of an interference vibration meter for objects with a non-planar surface is simulated using a computer. It is shown that neural technologies allow to use an interference method for measuring parameters of the moving objects with a non-planar surface. The results obtained of processing data of a computer simulation show the effectiveness of the practical application of neural networks for processing signals of the trisounder interference microwave meter

Sur la minéralogie de la fraction lourde des alluvions sableuses des pertuis charentais (pertuis d'Antioche et pertuis breton)

Barusseau J. P. Sur la minéralogie de la fraction lourde des alluvions sableuses des pertuis charentais (pertuis d'Antioche et pertuis breton). In: Bulletin de l'Association française pour l'étude du quaternaire, vol. 4, n°2, 1967. pp. 135-143

LA SÉDIMENTATION LAGUNAIRE DES DERNIERS SIÈCLES EN LANGUEDOC-ROUSSILLON. DONNÉES SÉDIMENTOLOGIQUES, ISOTOPIQUES ET PALYNOLOGIQUES

International audienc

Évolution historique du prisme littoral du lido de l’étang de Thau (Sète, Sud-Est de la France). Mise en évidence par sismique réflexion très haute résolution = Historical evolution of the littoral prism of the Thau lagoon barrier (Sète, South-East France). Very high-resolution reflection seismic investigation

Very high-resolution seismic data have been obtained recently, in the framework of the research programme PNEC (French National Programme of Coastal Environment), on the shoreline area of Sète (Mediterranean coast, South East France). These data provide an accurate picture of the internal structure of the shoreline body. Seismic results combined with data about the morphosedimentary evolution of the study area, vibrocore data and results from archaeological investigations yield clues to the historical evolution of the study area. Especially, it is pointed out that the functioning of the present-day shoreline, by comparison with the system built in classical times, is characterized by a severe reduction in sediment supply and in volumes of sand involved in the shoreline dynamics

Successions of sea-level changes during the Pleistocene in Mauritania and Senegal distinguished by sedimentary facies study and U/Th dating

International audienc

Typology of nearshore bars in the Gulf of Lions (France) using LIDAR technology

Nearshore bars are generally present on sandy coasts and play a significant role in wave breaking and sediment exchange between beach and shoreface. The study area is located on the Languedoc-Roussillon coast in the Gulf of Lions (southern part of the French Mediterranean coast). This microtidal environment is classified as a wave-dominated coast. The sand coast displays different bar systems (single or multiple; straight or crescentic). The alongshore variability of bar morphology in the nearshore zone was investigated in August 2009 during one week, using a topo-bathymetric LIDAR data set (300 km(2)). LIDAR makes it possible to cover a large area in a very short time with a high resolution. The topo-bathymetric LIDAR offers the added benefit of morphological information about the beach-sea transition in very shallow water (below I in), data often difficult if not impossible to obtain with traditional techniques. The purpose of this paper is 1) to depict the distribution of bars and their characteristics along the 180 km coast of the Gulf of Lions; 2) to update the classifications of sand bars typologies in Languedoc-Roussillon; 3) to pay particular attention to the description of the intricate inner system. Globally, cross-shore distribution of subtidal morphologies is characterized by both an outer and an inner system. The outer system is crescent-shaped in the south and straight in the northern part with a distinctive regional delimitation. The inner system comprises an inner bar and, near the coast, a complex fluctuating bar called Low Bar Beach (LBB). Several intermediate states were identified and added to the new classification proposed in this paper. These results clearly emphasize the importance of LIDAR technology for a better understanding of bar behaviour and single and/or multi-bar beach organisation