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How it works

We built a ~110 m three-dimensional hydrodynamic model of İzmir Bay (SCHISM), forced at the open boundary by Copernicus Marine data and driven by ERA5 winds. Floating particles (OpenDrift) move with the surface current plus 2% of the wind speed; a particle that touches the coast stays there.

The bay is divided into 1 km cells; from each cell we released hundreds of virtual particles and counted where they beached. When you click, we show that distribution for the nearest cell; the drawn path is a schematic line towards the landing point of a real model particle released from that cell.

Limitations

• One full year (September 2025 – August 2026): year, four seasons and each month can be selected; results reflect the weather of the chosen period.
• No wave-driven Stokes drift; beached litter does not refloat (the assumption that changes results most: with refloating, the Karaburun share halves and more litter leaves the bay); sinking and fragmentation are not modelled.
• Litter leaving the model area (dashed line on the map) through the northern or western open boundary counts as "outside the bay" and is dropped there; no current data beyond. About a third of all litter leaves this way over the year, half of it in winter (November–February).

Data and code

Everything is open: GitHub repository. Cell data is split per period: cells_<period>.json (period list in meta.json), coast zones zones.json. Throws are stored with an anonymous device id; no personal data is collected.