Author(s): G. Oliveto; D. Palma; A. Di Domenico

Linked Author(s): Giuseppe Oliveto

Keywords: No Keywords

Abstract: In this paper an analysis of physical experiments to simulate evolution and development of drainage networks is presented. Experiments were carried out at University of Basilicata using a 1.5 m by 1.5 m basin-simulator-box with an outlet in the middle of the downslope-end side. Experimental landscapes formed of a weakly cohesive soil mainly made by clay and silt. A system of micro-sprinklers delivered an almost uniform artificial precipitation. Simulations were performed at a constant rainfall intensity of 100 mm/h. Three planar slopes were tested, namely 8.5%, 5%, and 0.6%. Digital elevation models (DEM) of the evolving landscape were achieved through detailed soil surveys with a laser pointer and/or a laser scanner. Then, drainage networks were extracted from the DEMs using the D8 algorithm. Based on the data collected, the scaling properties of the simulated networks are analysed and compared with those of natural basins. Findings are provided mainly in terms of Hortonian descriptors, Hack's law, and topological fractal dimension. Peculiar differences between quasi-equilibrium and transient stages are also remarked.

DOI:

Year: 2009