Accession Number:

ADA426029

Title:

Near-Shore Hydrodynamic Conditions and Chemical Plume Tracking

Descriptive Note:

Final rept. 20 Aug 2001-31 May 2004

Corporate Author:

STANFORD UNIV CA DEPT OF CIVIL AND ENVIRONMENTAL ENGINEERING

Personal Author(s):

Report Date:

2004-07-22

Pagination or Media Count:

5.0

Abstract:

We characterize the hydrodynamic conditions relevant to a bottom source plume in a nearshore environment. Analyzing a dye concentration data set collected by a state of the art autonomous underwater vehicle and fixed hydrodynamic measurements, we quantify the meandering and lateral dispersion of a plume. We find that both processes are important to ultimate plume fate and transport. The lateral dispersion is governed by a scale-dependent processes that is driven by three-dimensional turbulence in the near field and two-dimensional turbulence in the far field. This project also demonstrates the importance of wave-induced transport in the near shore. We find that it can be significant at times and must be used to supplement measured Eulerian transport in order to accurately model cross-stream plume transport. Finally, we evaluate the accuracy of a bottom-racked acoustic Doppler current profiler and show that in certain circumstances, there is the potential for a bias error.

Subject Categories:

  • Miscellaneous Detection and Detectors
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE