摘要
与畅流期相比,河冰的存在改变了河道的水位、流量、流速分布、泥沙浓度等参数,进而影响水流的输沙能力及河道演变。通过对黄河内蒙古段冰封期的野外观测,分析了冰盖对水深、流速的影响。同时根据水文站多年资料分析,探讨了冰封期黄河内蒙古段泥沙特性及输移规律。指出冰封期泥沙浓度随着流凌开始降低,在冰封期达到最低,冰封期浓度值比畅流期小5-20倍,输沙量小2-15倍,开河后逐渐增大,且泥沙颗粒的中值粒径D50值大于畅流期的。本研究对黄河冰封期的泥沙输移规律以及河道演变提供一定的参考。
Ice cover induces an important influence on water level,discharge,and velocity profiles in river channels. The sediment transport rate is analyzed during ice season in the Inner Mongolia reach of Yellow River. The study shows that sediment concentration is lower at the beginning of freeze up. The lowest sediment concentration is in the freeze up period,and it is getting higher in the break up period. The sediment concentration and sediment transport rate in ice period is less than 5 - 20 times and 2 - 15 times as open flow period respectively. However the sediment diameter size D50 in ice period is lager than the open flow period. The discharge and sediment transport rate is getting lower because of ice cover. Finally the channel morphology evolution can be observed in the reach.
出处
《泥沙研究》
CSCD
北大核心
2015年第1期36-41,共6页
Journal of Sediment Research
基金
国家自然科学基金项目(51169017
5133902
51269016
512690171
51369017
)
内蒙古自治区自然科学基金资助项目(2012MS0721)
内蒙古自治区科技重大项目(水资源合理利用关键技术研究与示范)
关键词
黄河
冰封期
泥沙输移
河道地形
the Yellow River
ice period
sediment transport
channel morphology
