黄河什四份子弯道河冰生消及冰塞形成过程分析

发布时间：2018-06-22 23:00

本文选题：黄河 + 遥感　；参考：《水利学报》2017年03期

【摘要】：什四份子弯道因其特殊的河道形态及地理位置而成为黄河内蒙古段易发生冰塞断面。通过对2014—2015年冬季该段野外冰情监测及水文、气象资料分析,结合Landsat8遥感影像数据解译,研究了什四份子弯道河冰生消及冰塞形成过程。结果表明,野外观测结合遥感影像解译能够准确地反映河冰的时空特性。该河段弯道凹岸处冲积岸冰及凸岸静态岸冰的生长,极大地束窄了河面宽度,降低了水流的输冰能力,而使其成为初始卡冰位置;冰盖至此向上游发展,弯道下游因来冰量减少和上下游水力坡度增大而形成清沟;受弯道径向水流方向改变及弯道螺旋流的影响,导致冰花在冰盖下主槽与滩地的交界处堆积;稳封期受气温升降变化使得冰盖表面冻融交替,冲积冰反射率增大,后期解译的遥感影像中平滑岸冰面积较初始封河期增加。
[Abstract]:Due to its special channel shape and geographical location, Shijiaodong bend is prone to ice slug section in Inner Mongolia section of Yellow River. Based on the field ice monitoring, hydrological and meteorological data analysis, and Landsat8 remote sensing image data interpretation, the ice formation and formation process of the Shishijiaodao River are studied in this paper. The results show that field observation combined with remote sensing image interpretation can accurately reflect the temporal and spatial characteristics of river ice. The growth of alluvial and static bank ice at the concave bank of the bend of the river has greatly reduced the width of the river surface, reduced the ice transport capacity of the current, and made it become the initial ice holding position, and the ice cap has developed upstream. Due to the decrease of the amount of ice coming from the lower reaches of the bend and the increase of the hydraulic gradient of the upper and lower reaches, the trench clearance is formed, which is influenced by the change of the radial flow direction of the bend and the spiral flow of the bend, resulting in the accumulation of ice flowers at the junction between the main channel and the beach under the ice cover. The ice cover surface freeze-thaw alternately during the stable sealing period and the ice reflectivity of alluvial ice increases, and the smooth shore ice area in the remote sensing images interpreted in the later stage is increased compared with the initial river closure period.
【作者单位】：内蒙古农业大学水利与土木建筑工程学院;
【基金】：国家自然科学基金项目(51369017、51369021) 内蒙古自治区自然基金项目(2012MS0721)
【分类号】：TV875

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