Hyperpycnal River Plumes - An Opportunity to Study Their Transport and Deposition in a Controlled Dam-Removal Experiment

University Of Washington, Seattle WA

Investigators

Abstract

0623682 Ogston The PIs propose a study to exploit the removal of two dams on a small mountainous river to study processes and products of gravity-driven sediment dispersal on an energetic continental shelf. Hyperpycnal flows and fluid muds have been recognized as important modes of sediment transport on some shelves, relatively little is known about how they operate. The proposed study includes a comprehensive set of water column measurements and seabed sampling campaigns designed to capture the events anticipated to follow from dam removal. The proposed work will also complement field studies and modeling work to be carried out by USGS. The work will also provide physical evidence on the influence of waves, tides, and currents on high concentration sediment discharge. Broader impacts: Working in coordination with the USGS and other DOI agencies will help improve predictions as to the future fate of this coastline and will thus have considerable societal impact. The study is also planned for student training and as an example in oceanography course curricula.