论文部分内容阅读
利用最新冰凌观测数据,分析了1960年以来黄河内蒙古段头道拐断面冰期流量特点及其影响因素.结果表明:头道拐断面小流量持续时间的年际变化具有明显的阶段性特征,1960-1967年、1968-1985年和1986-2010年小流量平均持续天数分别为68 d、17 d和37 d.气候变化和人类活动是影响小流量过程的主要因素,气候变化通过影响冰盖厚度和冰花堆积来影响封冻河段流量过程;河道冲淤演变则是冰期流量过程和槽蓄水增量长期变化的重要原因;刘家峡水库调度直接影响着内蒙古河段的流量过程.最近10 a来,凌汛期气温变化剧烈,上游来水有所减少,河道淤积更加严重,河道工程增多是黄河头道拐断面小流量持续天数延长的主要原因.
Based on the latest ice observation data, the characteristics and influencing factors of glacial flow in the section of Tauranga section of the Yellow River in Inner Mongolia since 1960 are analyzed.The results show that the interannual variation of the duration of small flow in the section of Taudao section has obvious stage characteristics, 1967, 1968-1985 and 1986-2010, the average duration of small-flow was 68 d, 17 d and 37 d, respectively. Climate change and human activities were the main factors affecting the low-flow process. Climate change affected the thickness of ice sheet and Ice accumulation to affect the flow in the frozen section of the river; the evolution of the scouring and silting in the river channel is an important reason for the long-term changes in the glacial flow and the increment of the trough storage; the regulation of the Liujiaxia reservoir directly affects the flow in the Inner Mongolia section. In the recent 10 years, During the period, the air temperature fluctuated drastically, the inflow of upstream water decreased and the siltation of the river became more serious. The increase of the river course was the main reason for the prolongation of the small flow in the Yellow River headway.