In tow-tank tests of composite hull plates in ice, the conventional hull form performed worst — with no bow wave it took violent direct ice impacts, and ice was forced under the hull toward the propellers — while the tumblehome form (Zumwalt-style) shed ice around the hull with the lowest increase in peak force. Small craft without bulbous bows face exactly this flow pattern in Arctic sea lanes.

— In our words · Source: Hydrodynamic response of a composite structure in an Arctic environment (Scott H. Bolstad)