Laboratory Investigation of the Impact of Lateral Spreading on Buoyancy Flux in a River Plume

• DOI: 10.1175/jpo-d-12-0117.1
• Publication Date: 2013-08-13T16:43:37Z
• Authors: Yeping Yuan; Alexander R. Horn...
• Keywords: Neutral buoyancy; Panache

Abstract The relationship between lateral spreading and mixing in stratified gravity currents is investigated by comparing laterally confined unconfined a series of laboratory experiments. vertical turbulent buoyancy flux determined using control volume approach with velocity density fields derived from combined particle image velocimetry (PIV) planar-laser-induced fluorescence (PLIF). Lateral the experiments based on plan-view imaging optical thickness method (OTM). authors find that dramatically modifies plume structure; layer consists approximately linear profiles extend to surface, whereas channelized are uniform near surface. decreases average relative similar inflow conditions. However, local equal This apparent paradox resolved when areas taken into account. total integrated over horizontal area significantly higher Thus, suggest does not appreciably alter processes at base plume. it increases which this occurs and, through mechanism, net dilution river water fixed distance mouth. Finally, hypothesize increase because preferentially greatest core current.