Mapping and initial dilution estimation of an ocean outfall plume using an autonomous underwater vehicle

• Type: Another Publication in an International Scientific Journal
• Date: 2007

Authors

Ramos, PA (Author) Other; Neves, MV (Author) Other; Pereira, FL (Author) FEUP

Journal

Title: Continental Shelf Research

Vol. 27

Pages: 583-593

ISSN: 0278-4343

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 24 Citations

ISI Web of Science

Scopus - 23 Citations

Scientific classification

CORDIS: Technological sciences

FOS: Natural sciences > Earth and related Environmental sciences

Other information

Authenticus ID: P-004-BB9

DOI: 10.1016/j.csr.2006.11.017

Abstract (EN): A monitoring mission to study the shape and estimate initial dilution of the S. Jacinto outfall plume using an autonomous underwater vehicle (AUV) was performed on July 30, 2002. In order to reduce the uncertainty about plume location and to concentrate the vehicle mission only in the hydrodynamic mixing zone, outputs of a near-field prediction model, based on effective real-time in situ measurements of current speed and direction and density stratification, were opportunistically used to specify in real time the mission transects. The surface characteristics of the outfall plume were found to be influenced strongly by the relatively weak stratification and low current velocities. Dilution was estimated using a tempera tu re-salinity (TS-) diagram with initial mixing lines between wastewater and ambient waters. Effluent dilutions were at least 30:1 in this study. In order to efficiently map the plume dispersion we applied the least-squares collocation method technique. Our results demonstrate that AUVs can provide high-quality measurements of physical properties of effluent plumes in a quite effective manner and valuable considerations about the initial mixing processes under real oceanic conditions can be further investigated.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11