Researchers at the University of Lausanne have unveiled a groundbreaking simulation detailing how glaciers transported rocks across the Alps 24,000 years ago. Published on July 2, 2026, this study reconstructs the paths of erratic boulders, offering insights into the geological history of the Swiss landscape.
Understanding Glacial Transport Mechanisms
The simulation highlights that many boulders scattered throughout Switzerland originated from different locations, carried by massive glaciers during the last ice age. As glaciers advanced, they acted like bulldozers, eroding terrain, transporting sediment, and shaping valleys. Tancrède Leger, a researcher at UNIL's Faculty of Geosciences and Environment, stated, “Our simulation shows how glaciers transported rocks across the landscape and, for example, reveals the pathways by which some of them crossed mountain passes.”
By employing a unique tool named IGM, the researchers were able to visualize the trajectories of approximately 20.5 million modeled particles. This innovative method allows geologists to better understand the origins and transport pathways of glacial deposits.
The Role of Advanced Computing in Glaciology
Recent advancements in graphics processing units (GPUs) have made it feasible to compute the trajectories of millions of rocks and boulders with unprecedented speed. The IGM model, developed at UNIL, utilizes the parallel processing capabilities of GPUs to simulate glacier evolution under various climate scenarios.
