地理学报 ›› 2014, Vol. 69 ›› Issue (11): 1615-1627.doi: 10.11821/dlxb201411003
杨云平1,2(), 张明进1, 邓金运2, 李义天2, 樊咏阳2
收稿日期:
2014-08-04
修回日期:
2014-08-26
出版日期:
2014-11-20
发布日期:
2014-11-20
作者简介:
作者简介:杨云平 (1985-), 男, 黑龙江绥化人, 博士, 从事河口海岸演变研究。E-mail:
基金资助:
Yunping YANG1,2(), Mingjin ZHANG1, Jinyun DENG2, Yitian LI2, Yongyang FAN2
Received:
2014-08-04
Revised:
2014-08-26
Published:
2014-11-20
Online:
2014-11-20
Supported by:
摘要:
近年来长江流域入海沙量呈现阶梯性减小趋势,三峡水库蓄水后加剧了这一减小趋势,并通过传递效应影响河口悬沙浓度变化。基于长江口1950-2013年悬沙浓度数据,结果表明:① 长江口南支河段及口外海域悬沙浓度为减小趋势,且越向海域减幅越小,同时与流域入海沙量减幅差距加大;② 北支优势流变化不大,但悬沙浓度为减小趋势,主要为南支和海域大环境悬沙浓度减小所致;③ 拦门沙河段悬沙浓度的峰值区域因径流减小、潮流相对增强,2003-2012年较1984-2002年期间峰值位置向口内上溯约1/6经度,上溯距离洪季 > 年均 > 枯季;④ 1999-2009年南槽进口悬沙浓度减小,主要是再悬浮和滩槽交换引起的悬沙浓度增量小于流域和海域悬沙浓度锐减引起的减量,中段该作用相反,悬沙浓度为增加趋势;⑤ 北槽进口由于分流分沙比减小、流域和海域悬沙浓度减小及再悬浮量减小等综合影响下,1999-2012年逐年的8月份悬沙浓度呈减小趋势,中段越堤沙量作用明显高于外部坏境引起的减小量,为增加趋势。
杨云平, 张明进, 邓金运, 李义天, 樊咏阳. 长江口悬沙浓度变化的同步性和差异性[J]. 地理学报, 2014, 69(11): 1615-1627.
Yunping YANG, Mingjin ZHANG, Jinyun DENG, Yitian LI, Yongyang FAN. The synchronicity and difference in the change of suspended sediment concentration in the Yangtze River Estuary[J]. Acta Geographica Sinica, 2014, 69(11): 1615-1627.
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