本文選題：凌汛期　切入點：輸沙特征　出處：《水利學報》2017年11期 　論文類型：期刊論文

【摘要】：黃河內(nèi)蒙古河段沙質(zhì)河床的變化是影響該河段凌洪災害的因子之一。本次研究根據(jù)觀測數(shù)據(jù),統(tǒng)計分析了內(nèi)蒙河段凌汛期的輸沙特征,解釋了這種特性產(chǎn)生的機理,并在此基礎上探討了河床變化及影響。結(jié)果表明:黃河內(nèi)蒙河道凌汛期洪水具有較強的粗泥沙輸移能力,這是由于低溫水流具有高懸浮效率,同時冰的運動形成了特殊的水力學環(huán)境。大量粗泥沙的運動提高了開河期河床變化對洪水量級及形態(tài)的敏感程度,并使得橫斷面形態(tài)趨向?qū)挏\。凌汛期過后三湖河口至頭道拐河段河床明顯沖刷,而巴彥高勒到三湖河口河段淤粗排細,直接導致河底抬高。因此凌汛期輸沙特性帶來的河床變化應在防凌減災措施中給予充分的考慮。
[Abstract]:The variation of sandy riverbed in Inner Mongolia reach of the Yellow River is one of the factors affecting the flood disaster in this reach. Based on the observed data, the characteristics of sediment transport in the ice flood period of the Inner Mongolia reach are statistically analyzed in this study, and the mechanism of this characteristic is explained. On the basis of this, the variation and influence of river bed are discussed. The results show that the flood of the Yellow River in Inner Mongolia during the ice flood period has strong coarse sediment transport capacity, which is due to the high suspension efficiency of low temperature flow. At the same time, the movement of ice forms a special hydraulics environment, and the movement of a large amount of coarse sediment enhances the sensitivity of the river bed variation to the flood water level and form during the Kaihe period. After the ice flood period, the bed of the Sanhu Estuary to the Toutoudaokuanhe reach is obviously washed away, while the Bayangol Estuary to the Sanhu Estuary reach is silted and thin. Therefore, the river bed changes brought about by the characteristics of sediment transport during the ice flood period should be fully considered in the measures of ice prevention and mitigation.
【作者單位】： 西安理工大學西北旱區(qū)生態(tài)水利工程國家重點實驗室培育基地;
【基金】：國家自然科學基金面上項目(51679184) 國家重點基礎研究發(fā)展計劃(973計劃)項目(2011CB403305) 陜西省水利科技項目(2014slkj-01)
【分類號】：TV147;TV875

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