Lagoon data project

Observing natural environments

Ecosystem rehabilitation requires rigorous observation.

We dive to observe the maturity of seagrass seeds in order to trigger collection at the best time. We also monitor the growth of all the seagrass beds we plant, to assess results, improve our methods and identify optimal planting locations.

Air quality monitoring

In 2021, we developed citizen monitoring sensors. Following a warehouse fire in Saint-Chamas, we developed a connected fine particle sensor. We then created a PM10 fine particle sensor-building workshop where participants learn to solder and program a board while building a connected sensor. The data collected enriches a citizen air quality database.

Water quality monitoring

Seagrass seed replanting requires good knowledge of the lagoon's water temperature and salinity. Seeds germinate in winter when the temperature drops below a critical threshold. To monitor these parameters, we began manufacturing water measurement probes in 2024 to record lagoon temperature evolution. The water renewal system measures the temperature once per hour.

From end 2024, we installed 2 autonomous probes measuring temperature and conductivity every hour. Data is transmitted via WiFi from the Beaurivage port. The probes are designed and built in-house from commercial electronic modules and a 3D-printed casing. Battery life is estimated at 1 year, and the probes use low-impact LiFePO4 rechargeable batteries.

In 2025, we are developing a new probe with LORA antenna technology. In collaboration with the Saint-Chamas radio club, we are building an antenna network capable of receiving data from probes across the entire lagoon surface.