Landslides cause potentially costly damage and disruption to Scottish road infrastructure. Debris-flows, a fast-moving torrent of solids mixed with water, are by far the most frequent cause of such disruption and are capable of causing significant impacts, due to their high mobility.

The influence of gullies in amplifying the hazard from these failures is well understood, and much work has been carried out to characterise the way that rainfall intensity-duration influences slope activity. Until recently, smaller sediment movements and failures have proven difficult to quantify and thus questions have remained over their potential significance. However, small changes on the slope may also have the potential to highlight wider geomorphological controls of activity that are not so well understood.

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