Determination and Characterization of Deep Water Renewal Events in Loch Etive

Brooke Dunnery, Dr. Louis Keiner, Department of Marine Science, Coastal Carolina University, 100 Chanticleer Drive East, Conway, SC 29528

Loch Etive is a deep, glacially formed estuary on the west coast of Scotland. The loch is divided into two basins by the Bonawe Sill. This sill restricts deep water circulation, making the upper basin highly stratified due to freshwater runoff. Isolated bottom water may then become hypoxic (oxygen depleted) as a result of respiration, microbial activity, and other processes. Prolonged exposure to hypoxic water can cause respiratory stress in organisms, possibly leading to large die-offs. As a result of the negative implications of hypoxic bottom water in Loch Etive and the economic reliance of local communities on the loch, it is important to investigate and understand the mechanisms for deep water renewal. There are three main possible mechanisms for deep water renewal in sea lochs: local wind forcing, freshwater runoff, and tidal mixing. Wind, tide, and rainfall data combined with ship surveys of depth profiles will be used to determine which aforementioned mechanisms were responsible for distinct renewal events in Loch Etive in 2018, 2019, and 2020.

Additional Abstract Information

Presenter: Brooke Dunnery

Institution: Coastal Carolina University

Type: Poster

Subject: Environmental Science & Sustainability

Status: Approved

Time and Location

Session: Poster 6
Date/Time: Tue 2:00pm-3:00pm
Session Number: 4663