Activity and Formation of Sand Waves on Northern South China Sea Shelf
文献类型：CNKI期刊论文
| 作者 | Luan XW(栾锡武); Peng XC(彭学超); Wang YM(王英民); Qiu Y(邱燕) |
| 发表日期 | 2010-02-15 |
| 出处 | Journal of Earth Science
 |
| 关键词 | sand wave, northern South China Sea shelf, activity, formation. |
| 英文摘要 | Sand waves on the northern South China Sea shelf had been considered as stable relict bed form. For the industry use of sea bed between stations LF13-2 and LF13-1, a new round of explorations were conducted. The newly obtained data show that both spacings and amplitudes of sand waves are all systematically changing with water depth. Repeated observations since 2003 to 2004 showed that the sea bed is currently active. Due to strong erosion of surface sediment since Dongsha (东沙) uplifting, there are almost no modern sediments on the shelf of Dongsha area. Sand materials in the study area mainly originate from the erosion of the bed sediment formation. The water depth increment revealed by repeated echo sounder data is mainly due to erosion. Bottom currents are quite complex in the area of Dongsha underwater plateaus. At site 9MKII, the southward ebb current is stronger than the northward flood current, while at site AEM-HR, the WNW-ward flood current is slightly stronger than the ESE-ward ebb current. At site 9MKII, the maximum bottom current speed is 48 cm/s, and 22% of the observed bottom current speeds are larger than 20 cm/s, which meet the minimum bottom current speed required for the creation of sand wave. This article points out that present-day oceanographic condition couples well with the sand-wave morphologies, and that the sand waves are to a great extent in equilibrium with the ongoing present-day oceanographic bottom current condition and active. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | supported by the National Basic Research Pro-gram of China (973 Program) (No. 2007CB411702) ; the National Natural Science Foundation of China (Nos. 40572067, 40776032) |
| 卷 | v.21期:01页:59-74 |
| 语种 | 英文; |
| 分类号 | P736.1 |
| ISSN号 | 1674-487X |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/192269]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.GuangzhouMarineGeologicalSurvey,MinistryofLandandResources 2.KeyLaboratoryofMarineGeologyandEnvironment,InstituteofOceanology,ChineseAcademyofSciences 3.BasinandReservoirResearchCenter,ChinaUniversityofPetroleum(Beijing) |
| 推荐引用方式 GB/T 7714 | Luan XW,Peng XC,Wang YM,et al. Activity and Formation of Sand Waves on Northern South China Sea Shelf. 2010. |
入库方式： OAI收割
来源：海洋研究所
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