地理学报 ›› 2016, Vol. 71 ›› Issue (7): 1241-1254.doi: 10.11821/dlxb201607012
杨云平1,2(), 张明进1, 李义天2, 张为2, 由星莹2,3, 朱玲玲4, 王冬5
收稿日期:
2015-11-20
修回日期:
2016-03-15
出版日期:
2016-07-25
发布日期:
2016-07-25
作者简介:
作者简介:杨云平(1985-), 男, 黑龙江绥化人, 助理研究员, 主要从事水库下游水沙输移、地貌调整及河口海岸演变等研究。E-mail:
基金资助:
Yunping YANG1(), Mingjin ZHANG1, Yitian LI2, Wei ZHANG2, Xingying YOU2,3, Lingling ZHU4, Dong WANG5
Received:
2015-11-20
Revised:
2016-03-15
Published:
2016-07-25
Online:
2016-07-25
Supported by:
摘要:
流域水库工程的修建,将改变坝下游原有的水沙输移过程,三峡水库蓄水作用对坝下游水沙输移的影响已初步显现。具体表现为:① 三峡水库坝下游洪水持续时间和流量被削减,下泄沙量大幅减少,沿程上输沙量虽得到一定恢复,但总量仍未超过蓄水前多年均值;② 2003-2014年d > 0.125 mm(粗)输沙量得到一定恢复,至监利站恢复程度最大,基本达到蓄水前均值,在恢复后其下游该组分泥沙冲淤特性与蓄水前一致,其中2008-2014年恢复程度弱于2003-2007年;③ 三峡水库蓄水后坝下游d < 0.125 mm(细)输沙量沿程上得到一定程度恢复,但总量仍小于蓄水前均值;④ 三峡水库蓄水后坝下游d > 0.125 mm泥沙输移量因河床补给作用,沿程上得到恢复,但补给量将不超过0.44亿t/y,主要受制于洪水持续时间及流量均值,而上游干流、河段间支流和湖泊分汇作用占次要地位,而d < 0.125 mm悬沙恢复受上游干流、区间支流和湖泊分汇及河床补给控制,因河床粗化使得床沙对细颗粒悬沙的补给作用减弱;⑤ 2003-2007年和2008-2014年两时段间宜昌至枝城、上荆江为粗细均冲,下荆江为淤粗冲细,汉口至大通河段为淤粗冲细,城陵矶至汉口河段2003-2007年为淤粗冲细,2008-2014年为粗细均冲,这一差异受控于螺山站洪水流量持续时间和量值。
杨云平, 张明进, 李义天, 张为, 由星莹, 朱玲玲, 王冬. 长江三峡水坝下游河道悬沙恢复和床沙补给机制[J]. 地理学报, 2016, 71(7): 1241-1254.
Yunping YANG, Mingjin ZHANG, Yitian LI, Wei ZHANG, Xingying YOU, Lingling ZHU, Dong WANG. Suspended sediment recovery and bedsand compensation mechanism affected by the Three Gorges Project[J]. Acta Geographica Sinica, 2016, 71(7): 1241-1254.
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