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| 扬子浅滩沙波底形活动性评估 | |
| 引用本文： | 龙海燕,庄振业,刘升发,吕海青,叶银灿,杜文博.扬子浅滩沙波底形活动性评估[J].海洋地质与第四纪地质,2007,27(6):17-24. |
| 作者姓名： | 龙海燕 庄振业 刘升发 吕海青 叶银灿 杜文博 |
| 作者单位： | 1. 中国海洋大学,海洋地球科学学院,青岛,266100 2. 中国科学院,海洋研究所,青岛,266007 3. 国家海洋局,第二海洋研究所,杭州,310012 |
| 基金项目： | 国家自然科学基金项目(40476032) |
| 摘 要： | 扬子浅滩位于长江口以东,水深40 m左右,普遍发育中小水下沙丘并处于运动状态。按32片沙波参数统计,迁移方向在90°~180°之间,其中150°~180°者占30%,120°~150°者占69%;使用Rubin和改进的Hardisty公式计算,以潮流作用为主的常态海况下,沙波迁移率为19.70 m/a,以浪流为主的暴风浪期间,约为12.72 m/a,一年总迁移率约为32.4 m/a,与世界上若干海底沙波定位观测数据相对比,这一迁移率应属于缓慢—中等的量级。 |
| 关 键 词： | 沙波 迁移方向 迁移率 扬子浅滩 |
| 文章编号： | 0256-1492（2007）06-0017-08 |
| 收稿时间： | 2007-05-30 |
| 修稿时间： | 2007-08-15 |
ACTIVITY MAGNITUDE OF THE SMALL-MEDIUM SUBAQUEOUS DUNES IN THE YANGTZE SHOAL |
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| LONG Hai-yan,ZHUANG Zhen-ye,LIU Sheng-fa,L Hai-qing,YE Yin-can,DU Wen-bo.ACTIVITY MAGNITUDE OF THE SMALL-MEDIUM SUBAQUEOUS DUNES IN THE YANGTZE SHOAL[J].Marine Geology & Quaternary Geology,2007,27(6):17-24. | |
| Authors: | LONG Hai-yan ZHUANG Zhen-ye LIU Sheng-fa L Hai-qing YE Yin-can DU Wen-bo |
| Institution: | LONG Hai-yan,ZHUANG Zhen-ye,LIU Sheng-fa,L(U) Hai-qing,YE Yin-can,DU Wen-bo |
| Abstract: | The Yangtze shoal, located in the east of the Yangtze River Estuary and about 40 m deep below sea level,has widely spread small-medium subaqueous dunes, whose wave height is 0. 6 m and which are generally in activity. Statistical result of 32 subaqueous dune areas shows that the movement direction is within 90^o-180^o. 150^o-180^o direction accounts for 30% and 120^o-150^o for 69%. The movement velocity of the small-medium subaqueous dunes, calculated using the formulas from Rubin and Hardisty, is usually 19.70 m/a and controlled by tidal currents, and is 12.7 m/a in storm season. And the total migration rate is 32.4 m/a. Compared with observation data from other small-medium subaqueous dunes in the world, the activity of small-medium subaqueous dunes in the Yangtze shoal belongs to a slow-medium magnitude. |
| Keywords: | the small-medium subaqueous dunes transport direction transport velocity the Yangtze shoal |
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