Field observations, rheological testing and numerical modelling of a debris-flow event
The AA. investigate the dynamics and the rheological properties of a 90 000 m3 debris-flow event triggered by a rapid regression landslide with high water content which occurred on November 2002 along the Rossiga valley, Valsassina, Central Italian
Alps. The AA. combine different methods of analysis : direct description of the rheological behaviour of the involved material; field estimation of the rheological parameters (yield strength and viscosity) by means of empirical relationships
Determining rheological parameters of debris flow material
This paper outlines an investigation of the rheological behaviour of field debris flow materials using a newly designed and constructed 30o inverted cone-and-plate rheometer. A small 1 :5 scale model was also constructed and was used to test a wide
Block gliding and rheological deformation in the southern Sydney Basin
over which the blocks move, together with mounds, indicate that the block gliding is due to the rheological deformation of the underlying rock, even though it is a sandy siltstone lacking readily deformable beds. This phenomenon may be a significant
) experimental evaluation of rheologic parameters to provide control for numerical evaluation of dynamic responses of the LML to changes in sediment rheologic parameters.
Geothermal and rheological regime in the Po plain sector of Adria (Northern Italy)
The article presents a thermo-rheological study of the Adriatic crust in the central Po plain (Northern Italy), which records the convergence of the Alpine and Apennine external fronts. The present thermal regime of the crust is inferred from
The AA. present a coupled rheological-numerical model to characterize the debris flows in which cohesive and frictional materials are both present. As a first step, they consider small-scale artificial debris flows in a flume with variable
percentages of clay versus sand, and measure separately the rheological properties of sand–clay mixtures. A comparison with the predictions of a modified version of the numerical model BING shows a reasonable agreement between measurements and simulations
, the presence of large boulders and the higher normal pressure inside the natural debris flow requires the introduction of a novel rheological model that distinguishes between mud-to–clast supported material.
Sea-level data from various localities in the south Pacific are used in an attempt to constrain rheological models for the mantle and to evaluate melting models for ice sheets. A value of 10 poise is suggested as most likely for effective Newtonian
ratio between magmas towards low values and, hence, towards the best rheological conditions to trigger widespread mixing processes in the magma chamber. In conclusion, the present paper shows that combining fractal geometry measurements on natural rocks
the grain size distribution and composition of alpine debris flows up to 20 mm. The fraction of swelling clay was then varied and the rheological properties of the mixture tested using a large volume rheometer and a plate-plate geometry for the fine fraction.
On the basis of the rheological knowledge gained, it is suggested that intraplate seismicity can also be caused by coupling between surface processes and flow in the lower continental crust. This view is shown to be a natural consequence
pressure in the rheological behaviour of earth flow by means of a mechanistic model. He describes changes in lateral internal stresses due to a change in the velocity of the earth flow, which generates excess pore pressure followed by pore pressure
On the Faucon stream (South French Alps), representative of clay-shale basins, results of various rheological tests and numerical experiments are presented and discussed. The calibration of the model was undertaken using the results of both
the following 20 days, stress variations became more gradual. The AA. suggest that permutations and rotations of the principal stress axes are due to mechanical anisotropies or rheological variations within the fault zones of inherited faults. The inverted