| 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 |
| 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 |
| 投稿时间：2017-04-07 |
| DOI：10.13243/j.cnki.slxb.20170326 |
| 中文关键词: 凌汛期 输沙特征 河床变化 内蒙古河段 |
| 英文关键词: ice flood transport characteristics riverbed change Inner Mongolia reach |
| 基金项目:国家自然科学基金面上项目（51679184）；国家重点基础研究发展计划（973计划）项目（2011CB403305）；陕西省水利科技项目（2014slkj-01） |
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| 全文下载次数: 1793 |
| 中文摘要: |
| 黄河内蒙古河段沙质河床的变化是影响该河段凌洪灾害的因子之一。本次研究根据观测数据，统计分析了内蒙河段凌汛期的输沙特征，解释了这种特性产生的机理，并在此基础上探讨了河床变化及影响。结果表明：黄河内蒙河道凌汛期洪水具有较强的粗泥沙输移能力，这是由于低温水流具有高悬浮效率，同时冰的运动形成了特殊的水力学环境。大量粗泥沙的运动提高了开河期河床变化对洪水量级及形态的敏感程度，并使得横断面形态趋向宽浅。凌汛期过后三湖河口至头道拐河段河床明显冲刷，而巴彦高勒到三湖河口河段淤粗排细，直接导致河底抬高。因此凌汛期输沙特性带来的河床变化应在防凌减灾措施中给予充分的考虑。 |
| 英文摘要: |
| 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. |
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