水利学报2017，Vol.48Issue(11)：1269-1279,11.DOI:10.13243/j.cnki.slxb.20170326
黄河内蒙河段凌汛期河床变化的特点及其带来的影响
The characteristics of the riverbed change and its impacts in the Inner-Mongolia reach of the Yellow River during ice flood season
摘要
Abstract
One of the factors,impacting the ice flood disaster of the Inner-Mongolia reach,is the sand riverbed changes.According to the observed data,this research statistically analyzed the sediment transport characteristics of the Inner-Mongolia reach in the ice flood season,and explained the mechanism of generating the characteristics,and then on these bases the rule of riverbed scour and deposition and the riverbed change were studied.The results show that during the ice flood season the flow in the Inner-Mongolia reach has strong capacity in coarse sediment transportation,because the ice flood with lower temperature has the higher suspension efficiency than that of the summer one and the movement of the shifting ice forms a specific hydraulic regime.The transportation of vast coarse sediment increase the sensitivity of riverbed change to the flood magnitude and the shape of flood hydrograph,and the bed morphology becomes more shallow-wider.After ice flood season,the riverbed of the reach from Sanhuhekou to Toudaoguai has been obviously scoured,raising the riverbed of the reach from Bayangaole to Sanhuhekou due to the flushed fine grain sediment and the silted coarse sediment.Hence,the riverbed change caused by the characteristics of the sediment transport in ice flood season,should be considered fully in the measures for ice prevention and disaster mitigation.关键词
凌汛期/输沙特征/河床变化/内蒙古河段Key words
ice flood/transport characteristics/riverbed change/Inner Mongolia reach分类
建筑与水利引用本文复制引用
秦毅,李子文,刘强,李时..黄河内蒙河段凌汛期河床变化的特点及其带来的影响[J].水利学报,2017,48(11):1269-1279,11.基金项目
国家自然科学基金面上项目(51679184) （51679184）
国家重点基础研究发展计划(973计划)项目(2011CB403305) （973计划）
陕西省水利科技项目(2014slkj-01) （2014slkj-01）
