The topic of bank retreat is of particular relevance in the hydro-morphodynamic models aimed to the study of the planform evolution of rivers. In gravel-bed rivers, banks are often composite with an upper cohesive layer, and a basal layer composed by granular, relatively coarse sediments (gravel and cobbles). This research aims at gaining a better comprehension of some of the basic processes responsible for the retreat of coarse riverbanks; in particular, it focuses on the mass instability mechanisms due to the oscillations of water levels and pore water pressures, and on the particle erosion due to seepage flow. To this aim, a series of first laboratory experimental observations on the behavior of a bank mostly composed by gravel are here reported. The evolution of bank geometry from its initial configuration to the final one at the end of hydrograph is here reported and interpreted using both the measurements about the groundwater flow and mathematical modeling.
Experimental observations of the retreat of non-cohesive river banks / Nardi L.; Rinaldi M.; Solari L.. - STAMPA. - (2010), pp. 89-95. (Intervento presentato al convegno RCEM 2009: River, Coastal and Estuarine Morphodynamics tenutosi a Santa Fe, Argentina nel 21-25 September 2009).
Experimental observations of the retreat of non-cohesive river banks
NARDI, LAURA;RINALDI, MASSIMO;SOLARI, LUCA
2010
Abstract
The topic of bank retreat is of particular relevance in the hydro-morphodynamic models aimed to the study of the planform evolution of rivers. In gravel-bed rivers, banks are often composite with an upper cohesive layer, and a basal layer composed by granular, relatively coarse sediments (gravel and cobbles). This research aims at gaining a better comprehension of some of the basic processes responsible for the retreat of coarse riverbanks; in particular, it focuses on the mass instability mechanisms due to the oscillations of water levels and pore water pressures, and on the particle erosion due to seepage flow. To this aim, a series of first laboratory experimental observations on the behavior of a bank mostly composed by gravel are here reported. The evolution of bank geometry from its initial configuration to the final one at the end of hydrograph is here reported and interpreted using both the measurements about the groundwater flow and mathematical modeling.I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.