The Lagrangian Drifters, designed and built at Helmholtz-Zentrum Hereon, follow upper surface flow (approx. 50 cm). The main body consists of an 11 cm x 19 cm tube with a flotation ring, connected to a 35 cm drogue via a flexible cord. They transmit data through a global satellite network in near real-time, with Version 1 providing basic positional data and Version 2 offering additional environmental measurements.
Main Features:
- Compact design for surface flow tracking
- Real-time data transmission via satellite
- Two versions available with expandable sensor options
- Environmentally friendly design compared to existing models
Technical Requirements:
- Installation: Dropped overboard while sailing.
- Power Supply: 4 x 1.5V D-cell batteries; Version 1 approx. 20 mW, Version 2 approx. 30 mW.
- Size: Main body 23 x 19 x 19 cm; drogue 35 x 35 x 35 cm (folds to 35 x 35 x 0.5 cm).
- Waterproofness: Waterproof up to 1 m depth.
- Maintenance Requirements: Typically not recovered; if so, clean and replace batteries.
Data Processing:
Data is automatically transmitted via satellite on a predefined schedule (e.g., every 5 minutes).
Collaboration Partners:
Use Cases:
Ideal for monitoring ocean parameters during voyages on research vessels.
Development Status:
- Technology Readiness Level: TRL 7
The Lagrangian Drifter not only monitors surface currents but also allows for the integration of additional sensors, enabling the collection of data on parameters like salinity. Its fully autonomous design allows for years of maintenance-free operation, making it a cost-effective solution for ocean research. This technology enhances understanding of ocean currents, which is vital for climate research and navigation. Overall, the drifter plays a significant role in advancing marine science and environmental monitoring.