封冻期径流成分按补给来源分主要以地下水补给为主。

Based on the supplying resources, ground water was considered as the primary resource to the main runoff in the freezing period.

红色代表变暖的趋势：融冰期提早，封冻期后延，融冰季节变得更长。

Red indicates trends consistent with warming: earlier melt onset, later freezes, and longer total melt season.

根据地下水退水的一般规律，提出了针对天然河道封冻期流量推求方法的建议。

According to the general pattern of ground water lowering, this paper suggested a volume calculation method in the natural river courses in the freezing period.

北部的北德维纳河向北流经1350英里注入白海，全年封冻期竟长达190天。好评(0)。

The northern Dvina (1350 miles), which flows into the White Sea, is ice-blocked for 190 days.