三峡水库蓄水后下荆江急弯河道凸冲凹淤成因
发布时间：2018-11-02 20:33
【摘要】：三峡水库蓄水后沙量骤减使得荆江河段河床剧烈冲刷调整,下荆江急弯段"凸冲凹淤",部分弯道凹岸侧淤积形成水下潜洲。这种不同于弯曲河道一般性演变规律的异常现象势必给下荆江的行洪、航运及江湖关系变化等带来新的影响,其内在成因急需揭示。基于原型观测资料分析,通过研究滩槽冲淤量及分布、滩体及河道形态特征等,全面揭示了近期下荆江急弯段"凸冲凹淤"的演变特征及河道形态响应。结果表明,流量年内过程重分配、来沙量及组成突变是下荆江急弯段"凸冲凹淤"的决定性因素。
[Abstract]:After the three Gorges Reservoir impoundments, the sediment volume of the Jingjiang River reach is reduced sharply, the river bed of the Jingjiang reach is adjusted sharply, the lower Jingjiang section is "convex scouring, concave silting", and part of the curved channel concave bank silts up to form a submerged bank. This unusual phenomenon, which is different from the general evolution law of curved river, will inevitably bring new influence to the flood discharge, shipping and the change of the relationship between rivers and lakes in the Lower Jingjiang River, and its internal causes need to be revealed urgently. Based on the analysis of prototype observation data, the evolution characteristics of "convex scour and concave silt" and the responses of channel morphology in the near future are revealed by studying the amount and distribution of erosion and siltation in the channel, the characteristics of the beach body and the shape of the river channel, and so on. The results show that the redistribution of discharge, the amount of sediment and the sudden change of composition are the decisive factors of "convex scouring, concave and silting" in the section of the lower Jingjiang River.
【作者单位】： 长江水利委员会水文局;
【基金】：水利部公益性行业科研专项经费资助项目(201401021) 国家自然科学基金资助项目(51579186)~~
【分类号】：TV147
[Abstract]:After the three Gorges Reservoir impoundments, the sediment volume of the Jingjiang River reach is reduced sharply, the river bed of the Jingjiang reach is adjusted sharply, the lower Jingjiang section is "convex scouring, concave silting", and part of the curved channel concave bank silts up to form a submerged bank. This unusual phenomenon, which is different from the general evolution law of curved river, will inevitably bring new influence to the flood discharge, shipping and the change of the relationship between rivers and lakes in the Lower Jingjiang River, and its internal causes need to be revealed urgently. Based on the analysis of prototype observation data, the evolution characteristics of "convex scour and concave silt" and the responses of channel morphology in the near future are revealed by studying the amount and distribution of erosion and siltation in the channel, the characteristics of the beach body and the shape of the river channel, and so on. The results show that the redistribution of discharge, the amount of sediment and the sudden change of composition are the decisive factors of "convex scouring, concave and silting" in the section of the lower Jingjiang River.
【作者单位】： 长江水利委员会水文局;
【基金】：水利部公益性行业科研专项经费资助项目(201401021) 国家自然科学基金资助项目(51579186)~~
【分类号】：TV147
【参考文献】
相关期刊论文 前10条
1 朱玲玲;葛华;李义天;张为;;三峡水库蓄水后长江中游分汊河道演变机理及趋势[J];应用基础与工程科学学报;2015年02期
2 朱玲玲;陈剑池;袁晶;董炳江;;基于时段控制因子的荆江三口分流变化趋势研究[J];水力发电学报;2015年02期
3 方春明;胡春宏;陈绪坚;;三峡水库运用对荆江三口分流及洞庭湖的影响[J];水利学报;2014年01期
4 毛北平;吴忠明;梅军亚;陶武亮;;三峡工程蓄水以来长江与洞庭湖汇流关系变化[J];水力发电学报;2013年05期
5 李春光;景何仿;吕岁菊;周炳伟;杨录峰;;弯道水流运动和河床变形数值模拟研究进展[J];华北水利水电学院学报;2010年01期
6 余文畴;;长江中游下荆江蜿蜒型河道成因初步研究[J];长江科学院院报;2006年06期
7 张耀先,焦爱萍;弯曲型河道挟沙水流运动规律研究进展[J];泥沙研究;2002年02期
8 韩其为,杨克诚;三峡水库建成后下荆江河型变化趋势的研究[J];泥沙研究;2000年03期
9 唐日长;下荆江裁弯对荆江洞庭湖影响分析[J];人民长江;1999年04期
10 谈广鸣，宁磊，李付军;汉江皇庄至泽口河段撇弯切滩演变研究[J];泥沙研究;1996年02期
【共引文献】
相关期刊论文 前10条
1 杨云平;张明进;李松U，
本文编号：2306876
本文链接：https://www.wllwen.com/kejilunwen/shuiwenshuili/2306876.html
