Lake Titikaka Metocean Field Experiment
Abstract
The objective of this experimental pilot project is to measure wave generation, development and breaking in conditions of low air density. Waves grow under the influence of wind, typically described in terms of the wind speed and the air density. That is, the larger the wind speed or the higher the air density, the more energy is transferred from the wind to the waves. Numerous experiments and theories have focused on the prediction of wave growth by wind, but virtually all assume a constant air density. However, the air density is not constant, even at sea level, as, for example, low pressure systems like tropical cyclones can have reduced air density by up to 20%. The idea of the preliminary Lake Titicaca project is to experimentally test theoretical and empirical models used influid mechanics to describe wind-wave interactions at reduced air density. Specifically, we propose a unique field experiment wherewe measure waves generated in Lake Titicaca through the deployment of a wave buoy. Lake Titicaca is located at an altitude of 3800 m with atmospheric pressure reduced to some 60% by comparison with standard atmospheric pressure. Titicaca has an elongated shape with a long axis of 120 km and a short axis of 50 km. These wave fetches, plus deep waters (in excess of 250 m), are long enough for wave development across a full range of sea state conditions. This project is unique as the experiment will be the first-of-its-kind field to test the role of air density on wind-wave interactions. Project outcomes are a unique dataset of wave conditions at reducedair density, and a preliminary understanding of the physical impact of reduced air density on wind-wave growth. This is expected toimprove operational wave forecasting models.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 11, 2024
- Source ID
- N629092412025
Entities
People
- Alexander Babanin
Organizations
- Office of Naval Research
- United States Navy
- University of Melbourne