Thawing: the melting of ice on rivers, lakes, etc., or the act of melting ice; often used in seasonal or meteorological contexts.
春になって川の解氷が進み、水面に氷の割れ目が広がった。
With spring, the river thaw progressed and cracks in the ice spread across the surface.
港の解氷作業のため、砕氷船が出動した。
An icebreaker ship was dispatched to carry out thawing operations in the port.
気温上昇で湖の解氷が例年より早まった。
Rising temperatures caused the lake's thawing to occur earlier than usual.