Scale-Dependent Dispersion within the Stratified Interior on the Shelf of Northern Monterey Bay

作     者：Moniz, Ryan J. Fong, Derek A. Woodson, C. Brock Willis, Susan K. Stacey, Mark T. Monismith, Stephen G. 

作者机构：Stanford Univ Dept Civil & Environm Engn Environm Fluid Mech Lab Stanford CA 94305 USA Univ Georgia COBIA Lab Coll Engn Athens GA 30602 USA Univ Calif Berkeley Dept Civil & Environm Engn Berkeley CA 94720 USA 

出 版 物：《JOURNAL OF PHYSICAL OCEANOGRAPHY》 (物理海洋学杂志)

年 卷 期：2014年第44卷第4期

页      面：1049-1064页

核心收录：

学科分类：07[理学] 0707[理学-海洋科学] 

基　　金：NSF [OCE-0926340, OCE-0926738, OCE-0925916] Stanford Graduate Fellowship (SGF) Singapore-Stanford Program 

主　　题：Shear structure/flows Coastal flows Dispersion Circulation/ Dynamics In situ oceanic observations Observational techniques and algorithms Internal waves Tracers 

摘      要：Autonomous underwater vehicle measurements are used to quantify lateral dispersion of a continuously released Rhodamine WT dye plume within the stratified interior of shelf waters in northern Monterey Bay, California. The along-shelf evolution of the plume s cross-shelf (lateral) width provides evidence for scale-dependent dispersion following the 4/3 law, as previously observed in both surface and bottom layers. The lateral dispersion coefficient is observed to grow to 0.5 m(2) s(-1) at a distance of 700 m downstream of the dye source. The role of shear and associated intermittent turbulent mixing within the stratified interior is investigated as a driving mechanism for lateral dispersion. Using measurements of time-varying temperature and horizontal velocities, both an analytical shear-flow dispersion model and a particle-tracking model generate estimates of the lateral dispersion that agree with the field-measured 4/3 law of dispersion, without explicit appeal to any assumed turbulence structure.