Hydraulic modeling of runoff over a rough surface under partial inundation - Archive ouverte HAL Access content directly
Journal Articles Water Resources Research Year : 2007

Hydraulic modeling of runoff over a rough surface under partial inundation

(1) , (1) , (2)
1
2

Abstract

This study presents a numerical method to derive the Darcy-Weisbach friction coefficient for overland flow under partial inundation of surface roughness. To better account for the variable influence of roughness with varying levels of emergence, we model the flow over a network which evolves as the free surface rises. This network is constructed using a height numerical map, based on surface roughness data, and a discrete geometry skeletonization algorithm. By applying a hydraulic model to the flows through this network, local heads, velocities, and Froude and Reynolds numbers over the surface can be estimated. These quantities enable us to analyze the flow and ultimately to derive a bulk friction factor for flow over the entire surface which takes into account local variations in flow quantities. Results demonstrate that although the flow is laminar, head losses are chiefly inertial because of local flow disturbances. The results also emphasize that for conditions of partial inundation, flow resistance varies nonmonotonically but does generally increase with progressive roughness inundation.
Fichier principal
Vignette du fichier
2006WR005484.pdf (725.9 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-00391006 , version 1 (10-03-2021)

Identifiers

Cite

Nicolas Roche, Jean-Francois Daian, D. S. L. Lawrence. Hydraulic modeling of runoff over a rough surface under partial inundation. Water Resources Research, 2007, 43, pp.W08410. ⟨10.1029/2006WR005484⟩. ⟨insu-00391006⟩
49 View
21 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More