地理学报 ›› 2017, Vol. 72 ›› Issue (3): 420-431.doi: 10.11821/dlxb201703005
收稿日期:
2016-11-03
修回日期:
2017-01-25
出版日期:
2017-03-15
发布日期:
2017-03-15
作者简介:
作者简介:樊咏阳(1989-), 男, 江苏淮安人, 博士生, 主要从事河床地貌形态变化研究。E-mail:
基金资助:
Yongyang FAN1(), Wei ZHANG1(
), Jianqiao HAN1,2, Mengqing YU1
Received:
2016-11-03
Revised:
2017-01-25
Published:
2017-03-15
Online:
2017-03-15
Supported by:
摘要:
大型水库的兴建深刻改变了下游水沙输移特点,进而导致河床演变规律显著调整,水库下游弯曲河型对水沙过程改变响应敏感,是水库下游河床演变、航道整治、河势控制等方面研究的关键区域。本文基于1996-2016年的实测水文、地形资料,对长江三峡水库下游弯曲河型的演变规律及其驱动机制开展研究,结果表明:① 三峡水库蓄水前,下荆江存在“凸淤凹冲”、“凸冲凹淤”两类弯曲河型,而三峡水库蓄水后均表现为“凸冲凹淤”的一致性规律;② 在水库拦沙作用的影响下,下荆江河段平滩河槽存在累积性冲刷现象,冲刷部位集中于枯水河槽与基本河槽之间的低滩,冲淤部位调整主要由变化的流量过程所驱动,上游河势、河道边界以及支流入汇等因素均有一定驱动作用;③ 在三峡水库蓄水后缺乏大洪水的情况下,凸岸水流挟沙力随流量增加逐渐增强,水流对凸岸冲蚀力度在平滩流量级附近(20000~25000 m3/s)达到最强,平滩流量附近流量级的持续时间超过20天时,弯曲河道发生凸冲凹淤现象。而悬沙中造床粗沙的减少,增强了水流冲刷强度,加剧了凸岸的冲蚀程度。
樊咏阳, 张为, 韩剑桥, 余梦清. 三峡水库下游弯曲河型演变规律调整及其驱动机制[J]. 地理学报, 2017, 72(3): 420-431.
Yongyang FAN, Wei ZHANG, Jianqiao HAN, Mengqing YU. The typical meandering river evolution adjustment and its driving mechanism in the downstream reach of TGR[J]. Acta Geographica Sinica, 2017, 72(3): 420-431.
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