A thirteen-year record of bathymetric changes in the North Passage, Changjiang (Yangtze) estuary
A thirteen-year record of bathymetric changes in the North Passage, Changjiang (Yangtze) estuary
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DOI：
10.1016/j.geomorph.2013.01.004
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发表时间：
2013-04
期刊：
影响因子：
3.9
通讯作者：
Z. Dai;James T. Liu;Gui Fu;Hua-liang Xie
中科院分区：
文献类型：
--
作者：
Z. Dai;James T. Liu;Gui Fu;Hua-liang Xie
世界上主要河流的入海口一直是重要的水道，因此，受到重大的人为干预。因此，有必要了解自然过程和人类干预在泥沙运动和沉积中的耦合，以确定主要河流河口地区的长期地貌动力学演变。采用多元统计技术对长江口内重要航道--长江口北航道及整个长江航道的高分辨率水深数据进行了分析。我们的发现表明，有两种模式的水深变化。第一种模式代表了85%的可变性，包括沿运输通道的外围腹股沟区域的沉积和运输通道的加深，这主要是由于通道维护。第二种模式代表了6%的河口浅滩变异性(向海迁移和缩小)，这是由于三峡大坝导致长江输沙减少，以及疏浚增加了退潮。
The mouths of major rivers in the world have always been important waterways and as a result, subject to significant human intervention. Therefore, it is necessary to understand the coupling of natural processes and human intervention in the sediment movement and deposition to determine long-term morphodynamic evolution in the mouth regions of major rivers. A multivariate technique was used to analyze high-resolution bathymetric data from the North Passage of Changjiang (Yangtze River), which is the vital shipping channel in the mouth region and for the entire Changjiang waterway. Our findings show that there are two modes of bathymetric changes. The first mode represents 85% of the variability, which includes the deposition in the peripheral groin fields along the shipping channel and deepening of the shipping channel, which is primarily due to the channel maintenance. The second mode represents 6% of the variability of the river-mouth shoal (seaward migration and size reduction), attributable to the declining sediment discharge of the Changjiang due to the Three Gorges Dam, and the enhancement of the ebb flow as the result of dredging.