2004,127,1215 JTCVS.pdf (original) (raw)
Related papers
2016 Greco e Moramarco JHE.pdf
This paper deals with the analytic-theoretical derivation of the relationships between the entropic quantity ΦðMÞ, representing the ratio between the mean and maximum flow velocities, and the relative submergence and aspect ratios, using classical open-channel flow equations. ΦðMÞ is found to be highly dependent on the relative submergence when large or intermediate roughness scales occur, whereas it might be assumed to be almost constant for a small roughness scale. Furthermore, considering the hydraulic geometry relationships, an attempt is made to relate the relative submergence to the aspect ratio of flow through a log relationship whose coefficients depend on the local bed slope, with an important implication for hydrological practices. Then a practical relation between ΦðMÞ and the aspect ratio is proposed and validated in an operative chain for discharge assessment that shows high robustness and stability. The proposed model has been applied to a set of experimental velocity data collected at gauged river sites with different geometric and hydraulic characteristics as well as low, medium, and high flows.dividual papers. This technical note is part of the Journal of Hydraulic Engineering, © ASCE, ISSN 0733-9429/06015015 /$25.00. © ASCE 06015015-1 J. Hydraul. Eng. J. Hydraul. Eng. Downloaded from ascelibrary.org by Bruno Brunone on 08/24/15. Copyright ASCE. For personal use only; all rights reserved. © ASCE 06015015-6 J. Hydraul. Eng. J. Hydraul. Eng. Downloaded from ascelibrary.org by Bruno Brunone on 08/24/15.
Geodetic evidence of crustal deformation in the Ionian area detected by GPS surveys is given in this paper. A network consisting of nine geodetic sites crossing the Ionian sea from Calabria (southern Italy) to northwestern Greece was repeatedly surveyed, starting in 1991, within the framework of the TYRGEONET project. The results, obtained from processing data from three GPS campaigns performed on the same network in 1991, 1994 and recently in 1995, show significant changes in the positions of five sites. The deformations in terms of displacements (coordinate differences), are obtained by applying a rigorous statistical approach that analyses their significance by an original iterative procedure based on the classical F (Fisher) test.