Searched for: author%3A%22Stecca%2C+G.%22
(1 - 7 of 7)
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Chavarrias Borras, V. (author), Stecca, G. (author), Blom, A. (author)
In this paper we analyze the Hirano active layer model used in mixed sediment river morphodynamics concerning its ill-posedness. Ill-posedness causes the solution to be unstable to short-wave perturbations. This implies that the solution presents spurious oscillations, the amplitude of which depends on the domain discretization. Ill-posedness...
journal article 2018
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Stecca, G. (author), Siviglia, Annunziato (author), Blom, A. (author)
We present an accurate numerical approximation to the Saint-Venant-Hirano model for mixed-sediment morphodynamics in one space dimension. Our solution procedure originates from the fully-unsteady matrix-vector formulation developed in [54]. The principal part of the problem is solved by an explicit Finite Volume upwind method of the path...
journal article 2016
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Orru, C. (author), Blom, A. (author), Chavarrias Borras, V. (author), Ferrara, V (author), Stecca, G. (author)
We present a new image analysis technique for measuring the grain size distribution (texture) of the bed surface during flow in a laboratory experiment. A camera and a floating device are connected to a carriage used to take images of the bed surface over the entire flume length. The image analysis technique, which is based on color segmentation...
journal article 2016
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Orru, C. (author), Chavarrias Borras, V. (author), Ferrara, V. (author), Stecca, G. (author), Blom, A. (author)
A flume experiment was conducted to examine the evolution of a sand-gravel reach under a lack of sediment supply. A bed composed of a bimodal sediment mixture was installed with a uniform slope and an gradual fining pattern. At the upstream end of the flume the initial bed consisted of 100% gravel, which decreased stepwise (10% steps) in...
conference paper 2015
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Stecca, G. (author), Siviglia, A. (author), Blom, A. (author)
Sediment of different size are transported in rivers under the action of flow. The first and still most popular sediment continuity model able to deal with mixed sediment is the so-called active layer model proposed by Hirano (1971, 1972). In this paper, we consider the one-dimensional hydromorphodynamic model given by the Saint-Venant equations...
journal article 2014
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Stecca, G. (author), Siviglia, A. (author), Blom, A. (author)
journal article 2014
document
Stecca, G. (author), Blom, A. (author)
Modelling the morphodynamic evolution of rivers due to flow-driven sediment transport requires the adoption of a flow model, such as the shallow water equations, and a conservation equation for sediment mass (the Exner equation). When dealing with mixtures of grain sizes, one can account for the interaction among sediment transport, bed level...
conference paper 2013
Searched for: author%3A%22Stecca%2C+G.%22
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