摘要
对凌汛期头道拐水文站小流量过程进行了分析,界定了小流量的阈值范围,统计分析了小流量的变化规律,并分析了小流量过程的影响因素。结果表明:①头道拐小流量的上限阈值为350 m3/s;②1998—2009年头道拐水文站小流量持续时间与1986—1997年相比,首封段由平均17 d延长至平均39 d,分段合计小流量持续时间由平均28 d延长至平均45 d;③头道拐小流量过程的影响因素主要有上游来水减少、内蒙古河段气温变化、槽蓄水增量增大、河道淤积、个别年份河道内桥梁工程影响等。
Low discharge process of Toudaoguai Hydrological Station in ice flood period was analyzed, threshold value of low discharge was con- firmed, variety rules and possible influencing factors of low discharge were analyzed. The results show that： ①upper threshold value of low dis- charge is 350 mH/s; ②compared with the period from 1986 to 1997, duration of low discharge in 1998 to 2009 is prolonged, first freezing-up sec- tion extends to mean 39 days from 17 days, subsections summation increases to 45 days from 28 days; ③The impact factors includes reducing of upper runoff, temperature variety of Inner Mongolia reach, increment of channel storage, uplifting of river channel siltation, effecting of bridge pro- iect in individual year and so on.
出处
《人民黄河》
CAS
北大核心
2012年第12期27-29,共3页
Yellow River
关键词
凌汛
影响因素
小流量过程
头道拐
内蒙古河段
黄河
ice flood
affecting factor
low discharge process
Toudaoguai
Inner Mongolia reach
Yellow River
