近期黄河上游内蒙古段河岸冲淤变化特征与原因分析

发布时间：2019-01-10 19:59

【摘要】：通过连续4年对黄河内蒙古段河道28条大断面进行测量,提取测次间河岸蚀淤量,分析了2011-2014年间汛期和非汛期黄河内蒙古段河岸蚀退与淤进速率频率分布特征,以及河岸蚀退和淤进与水沙因子的关系。结果显示侵蚀性岸段占64%,平均蚀退速率0.147m/d;淤积性岸段占31%,平均淤进速率0.335m/d。不论蚀退还是淤进的速率频率分布都表现为明显的正偏,其对数值都呈现为正态分布。河岸蚀淤量统计结果显示河槽缩窄趋势近期已减缓。河岸蚀退速率与淤进速率都与流量成正相关,分析揭示河岸蚀退速率及淤进速率与水沙因子的关系主要是河岸蚀淤响应洪枯期流量变化而调整的结果。
[Abstract]:By measuring 28 large sections of the Inner Mongolia section of the Yellow River for 4 consecutive years, the riverbank erosion and siltation amount was extracted and the frequency distribution characteristics of the rate of erosion retrogression and siltation in the Inner Mongolia section of the Yellow River during the interflood period of 2011-2014 and non-flood season were analyzed. And the relationship between erosion and deposition of riparian banks and water and sediment factors. The results show that the erosive shore segment accounts for 64%, the average erosion rate is 0.147 m / d, and the silting shore section accounts for 31%, and the average siltation rate is 0.335 m / d. The rate frequency distribution of erosion return is obviously positive deviation, and its logarithmic value is normal distribution. The statistical results of river bank erosion and deposition show that the trend of channel narrowing has slowed down recently. Both riparian erosion rate and siltation rate are positively correlated with discharge. The analysis shows that the relationship between riparian erosion rate and sediment factor is mainly due to the adjustment of riparian erosion and siltation in response to flow variation during flood and dry period.
【作者单位】：中国科学院地理科学与资源研究所陆地水循环及地表过程重点实验室;
【基金】：国家重点基础研究发展计划项目(2011CB403305) 国家自然科学基金面上项目(41371036)
【分类号】：TV147.1

【共引文献】