The empirical characterisation of the longitudinal ﬂow velocity and of ﬂow resistance in rough channels hasbecome a classical theme in open-channel hydrodynamics. An analysis of the current theoretical paradigm(schlichting-gersten-2000) shows that there are still open topics of research, despite decades of research. Of particular interest for the characterisation of ﬂow resistance is the deﬁnition of the friction velocity, the parametrisationof the roughness height, z0, for a given deﬁnition of u* and the universality of the Von Kármán (k). Considerableresearch efforts have also been placed to account for the inﬂuence of sediment transport. However, such researchimported the ambiguities of the immobile bed conceptual framework. In this work, key concepts of this frameworkwill be reviewed to accommodate the speciﬁcity of open-channel ﬂows carrying bedlaod. The focus will be placedon the Von Kármán constant, k, and the roughness height z0.
|Title of host publication||Geophysical Research Abstracts|
|Publication status||Published - 1 Jan 2010|
|Event||EGU General Assembly - |
Duration: 1 Jan 2010 → …
|Conference||EGU General Assembly|
|Period||1/01/10 → …|