13 research outputs found
Turbulence in Rivers
The study of turbulence has always been a challenge for scientists working on geophysical flows. Turbulent flows are common in nature and have an important role in geophysical disciplines such as river morphology, landscape modeling, atmospheric dynamics and ocean currents. At present, new measurement and observation techniques suitable for fieldwork can be combined with laboratory and theoretical work to advance the understanding of river processes. Nevertheless, despite more than a century of attempts to correctly formalize turbulent flows, much still remains to be done by researchers and engineers working in hydraulics and fluid mechanics. In this contribution we introduce a general framework for the analysis of river turbulence. We revisit some findings and theoretical frameworks and provide a critical analysis of where the study of turbulence is important and how to include detailed information of this in the analysis of fluvial processes. We also provide a perspective of some general aspects that are essential for researchers/ practitioners addressing the subject for the first time. Furthermore, we show some results of interest to scientists and engineers working on river flows
Un pouvoir à négocier : le cas de Marguerite d’Anjou. Traduit par E. Bousmar
Titre original de la contribution: "Negotiating power : the case of Margaret of Anjou". La contribution examine les conditions et modalités d'exercice du pouvoir politique par la reine d'Angleterre Marguerite d'Anjou (15e siècle)