Del Sasso, S.F; Sole, A.; Bateman, A.; De Medina, V.; Mirauda, D.; Volpe, A.; Giosa, L.; Guariglia, A. Houille blanche-revue internationale de l eau num. 6, p. 88-95 DOI: 10.1051/lhb/20150073 Data de publicació: 2015-12 Article en revista
Landslides and debris flows can strongly interact with the river network and its mass transport processes, determining modifications of the river pattern with consequent effects on the hydrodynamic phenomena, alterations of the existing morphologies and possible interferences with anthropic works. Modifications of the cross section geometry and channel slope may produce changes in the sediment budget, with consequent repercussions on the stream evolutionary dynamics and its equilibrium configuration, leading to a new river branch arrangement. In this paper, investigations were carried out on a gravel-bed reach in the middle valley of the Noce River in Basilicata (Italy), which in 2007 suffered a progressive morpho-hydrodynamic change caused by a landslide. Because of the phenomenon complexity, mainly due to the mutual interaction between the landslide and the river transport dynamics, an integrated approach that combines field observations and numerical modelling in a spatial scale and natural environment, rarely available in literature, is suggested. The results highlight a satisfying correspondence between the altimetric profiles obtained through the numerical models and those deriving from the field surveys.
Thiebot, J.; Idier, D.; Falques, A.; Calvete, D.; Certain, R.; Garnier, R. Houille blanche-revue internationale de l eau num. 1, p. 97-103 DOI: 10.1051/lhb/2010011 Data de publicació: 2010 Article en revista
Crescentic bars emerge as free instabilities of the coupling between topography and water motion. Their long term behaviour will be studied in the real case of the French Aquitaine beaches by using the 2DH numerical model MORFO55. For the first time, the equilibrium state of a crescentic bar system is obtained, in the case of steady incident wave conditions. Due to non linear interactions, the final wave length of the system does not inevitably increase with the incident wave height. Finally, the study of variable incident wave conditions suggests that the equilibrium state may depend on the initial conditions.