We're seeing human and anthropic rather than natural phenomena.
From a geographic point of view, we're seeing more erosion on the natural shorelines than on the anthropized shorelines where infrastructure has been built, for example, on Île Marie, near Verchères. There's a lot more erosion along the south bank of the seaway than on the north bank, which has suffered virtually no erosion and still has well-developed wetlands. There has clearly been quite a significant anthropic effect.
The big problem for us is knowing how the natural phenomena and human phenomena, which include shipping, impact the shorelines that have been anthropized and where riprap has been installed. It's not always easy for us to understand that. They have impacts, as the documentation confirms, but how do they affect the shorelines where riprap has been installed?