论文部分内容阅读
3月25日黄河内蒙古封冻河段平稳开河,标志着2013—2014年度黄河防凌工作胜利结束。本年度黄河宁蒙河段凌情特点主要为:冷空气势力较弱,气温持续偏高;首凌日期、首封日期偏晚;封冻发展缓慢,宁夏河段出现两封两开;封河流量大,冰下过流能力较强;槽蓄水增量接近常年;冰层偏薄,河道水位偏低,开河日期偏早。黄河干流累计最大封冻长度755.5 km。其中,上游宁蒙河段686 km,为1986年以来封冻河段最短的年份;中游河段累计封冻69.5 km;下游河段虽未
On March 25, the opening of the Yellow River Inner Mongolia Frozen Section opened smoothly, marking the end of the victory of the Yellow River prevention work in 2013-2014. This year, the Ningxia-Menghe section of the Yellow River mainly has the following characteristics: the cold-air force is weak and the temperature is continuously high; the first-day date and the first closure date are too late; the slow development of freezing has two slow- Overcurrent capacity under ice is strong; trough water storage increment is close to perennial; ice layer is thin, water level of river is low, and river opening date is earlier. The maximum accumulated length of the main stream of the Yellow River is 755.5 km. Among them, the upper reaches of Ningmeng reach 686 km, which is the shortest of the frozen river reach since 1986; the middle reaches reach a total of 69.5 km; and the lower reaches