3D Printed Terrain Recreates the Blatten Avalanche for Research

A Miniature Valley Built in 100 Days

Researchers at the WSL Institute for Snow and Avalanche Research and ETH Zurich have assembled a 3D printed physical model of the terrain around Blatten, the Swiss village hit by a devastating rock avalanche in 2025. The model covers roughly 12 square metres and measures up to 5.4 by 4.5 metres.

Building it took about 100 days of printing. Custom software divided the landform into 56 separate sections, each roughly 50 by 50 centimetres. After printing, the pieces were assembled, coated, and painted inside a former military bunker near Davos. That finishing step was essential. The team needed the right roughness and optical properties for the experiments to behave like real terrain.

Running the Avalanche in a Lab

The setup includes an inclined flow channel 4.5 by 2 metres and a horizontal runout stretch up to 6 metres. To run an experiment, the team mixes water, sand, and clay in proportions chosen to match a specific event, then pours the mixture into a box at the top. A hatch releases it, and the slurry rushes down the slope from the direction of Kleines Nesthorn before settling across the simulated valley.

Sensors track the whole run. Cameras, lasers, a 3D scanner, a force plate, and pore pressure sensors measure depth of runoff, speed, runout distance, deposition patterns, and impact dynamics. The maximum input mass is one tonne, though most tests so far have used around 48 litres of material.

Why Build a Physical Model at All

Computer simulations alone are not enough. The research group is developing virtual models to simulate debris flows and rock avalanches across the Alps, but those models need validation. The physical tests give the team controlled experiments where they can see what happens when mixtures of water, ice, and rock hit obstacles, move at different speeds, or interact with terrain features that are hard to capture in software.

Christophe Ancey, a researcher on the project, put it plainly: these models must be tested in carefully controlled experiments if they are to be reliable. The Blatten model is the first landform reconstructed at this scale, but the substructure is built to handle other areas in the future.

3D Printing as a Research Tool

This is part of a broader pattern. Researchers are turning to 3D printing to build physical stand-ins for processes that are otherwise hidden or too large to instrument directly. At Texas A&M, Gabriel Tatman used 3D printed models made from actual rock fracture data to study how fluids move during hydraulic fracturing. Whiteclouds worked with MineBridge Software to 3D print a full-color topographic model of a Nevada mine waste site from aerial photographs.

In each case, the printed object exists to make an inaccessible process or landscape something researchers can watch, measure, and test under controlled conditions. The Blatten model is the latest example of that approach applied to natural hazard research.