Resursele de apă din România. Vulnerabilitate la activităţile antropice
[Water resources from Romania. Vulnerability to the pressure of man’s activities]

Conference Proceedings
ISBN: 978-606-8042-65-7

11-13 June 2010, Targoviste - Romania

Editors
Petre Gâştescu
Petre Breţcan

METODA DE PROPAGARE A UNDELOR CINEMATICE PE BANDĂ ŞI COMPUNEREA UNDELEOR DE PE BENZI PE FIRELE DE VALE
MODELUL BANDA

Adrian APOSTOL
C.N.P.H – I.N.H.G.A  Bucureşti – România
hadrianus150ac@yahoo.com,

INTEGRATION FLOW ON SLOPES  WITH DRAINAGE STRIP METHOD
Abstract. Assumptions of this method are based on 2 principles, the principle of continuity and 2nd principle of Newtonian Mechanics applied in conditions of fluid flow at open level in a very wide channel, more precise,  propagation of Saint-Venant system of equations by finite difference method in wide channels. Method aims at Kinematic waves propagation, one-dimensional, imposing the condition of hard incompressible fluid and considering that the side consists of rectangular channels with varying widths where the continuity equation and the equation of motion, transformed into specific discharge equation on unit channel width,  is valid, equations in which the hydraulic radius is estimated to layer tape leaked, valid condition because the band width is much larger than the layer leaked. These rectangular channels are chosen so that the work done by water dripping blade to sweep the water to wire valley  to be minimum, but also that whatever the rectangular channel, flow must be perpendicular to the contour lines. Another condition for the band width is given by the fact that the motion is quasi-permanent, which means that fluid movement is to proceed without velocity fluctuations, which is translated by the uniform band slope. It is wanted, as much as possible, to choose bands so that the distance between contour lines to be constant over the entire band. By the aforementioned method aims to follow as closely as topographic features of slope. Each valley thread is considered as a creek, and bands which discharge into this thread are considered small tributaries of the creek. Composition waves from the wire strip valley is made by algebraic summing dephase, taking into account hidrographs levels or discharges obtained the discharge point of each strip, point considered at the middle of the strip, , this summing ending at the hidrographic basin closure section, on which we apply this method.

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© Asociatia Romana de Limnogeografie (2008)