Explorer Note #1: Ice Breakup

The Ice Begins to Drift

River flowing through late winter landscape as ice begins to break up.

At first glance the river seemed unchanged, flowing quietly through the cold air as it has all winter. But if you watch closely, something is happening.

Small pieces of ice drift slowly downstream, breaking away from the frozen edges and sliding into the current. Some spin gently before disappearing around the bend. Others collide softly and continue on their way.

Small piece of river ice drifting downstream during late winter breakup.

As temperatures rise and daylight lingers longer, ice along the river's surface begins to weaken. The moving water beneath fractures it from below, carrying pieces away one by one, a quiet process, subtle enough that most people walk past without ever noticing.

In Toozli, the Tidespeakers say the river and winter share an ancient agreement: one lays the world to rest, while the other keeps the depths breathing.

Step closer. Watch the current. The seasons rarely change all at once, they begin with small movements, in quiet places, while most of the world is still looking the other way.

Melting riverbank ice and snow with flowing water during late winter thaw.

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FIELD NOTE 

As winter ends, increasing sunlight and rising temperatures weaken river ice from above, while flowing water fractures it from below. Pieces break free and drift downstream in a process called ice breakup, often the first visible sign that a river is transitioning from winter freeze toward spring flow.

De Coste, M., et al. (2023). The prediction of mid-winter and spring breakups of ice covers in rivers. Cold Regions Science and Technology.