Izvorni znanstveni članak
Numerical analysis of hysteresis in rating curves for open channel flow
Vanja Travaš
; University of Rijeka, Faculty of Civil Engineering, Radmile Matejčić 3, HR-51000 Rijeka, CROATIA
Nino Krvavica
; University of Rijeka, Faculty of Civil Engineering, Radmile Matejčić 3, HR-51000 Rijeka, CROATIA
Ivana Radman
; University of Rijeka, Faculty of Civil Engineering, Radmile Matejčić 3, HR-51000 Rijeka, CROATIA
Sažetak
For the purpose of studying the hysteresis in rating curves for unsteady flow regime in open channels, a numerical analysis of water wave propagation is performed by a numerical integration of one-dimensional (1D) Saint Venant differential equations. By applying two different boundary conditions, which are specified as the time change in water level h at the upstream boundary of the flow domain, it is shown that the downstream rating curves can obtain the same shapes in the Q-h plane. However, to emphasize the expected difference in rating curves, a third, time axis, is added. Accordingly, the rating curves obtain a spatial shape from which the dynamics of evolution in the relation between the stage h and related discharge Q can be evidenced. Apart from the description of the used numerical formulation (based on the method of characteristics), a numerical example is also presented in the support of the given statements.
Ključne riječi
rating curve; Saint Venant equations; open channel flow; water wave propagation
Hrčak ID:
184944
URI
Datum izdavanja:
18.7.2013.
Posjeta: 357 *