冰凌,黄河安全的杀手。堤坝决口,河水漫溢,历史上黄河流域无数百姓遭殃受难。 内蒙古830公里河段,呈“n”型直角状大弯曲,位于黄河上游最北端,是整条河流气温最低、结冰期最长、凌情最严重的河段。最低气温可降至零下35度,结冰期常达4～5个月。自1736年以来,平均每年卡冰结坝20多处,最多的达40多处,年年发生冰凌灾情,较大范围的淹没损失,平均两年一次。最大的流冰达18万平方米,最长的冰 Ice Ling, Yellow River safety killer. The embankment burst, the river overflows, the history of the Yellow River countless people suffered. Inner Mongolia 830 km of river, was “n” type rectangular large curved, located in the northernmost upper reaches of the Yellow River, is the lowest temperature of the entire river, the longest ice period, the most serious ice age. The minimum temperature can be reduced to minus 35 degrees, the ice often up to 4 to 5 months. Since 1736, on average, more than 20 ice-dam dams have been installed each year, reaching a maximum of more than 40 places. Ice-storm disaster occurs annually, and flooding losses in a large area take an average of once every two years. The largest ice flow reaches 180,000 square meters, the longest ice