福建闽江口和九龙江口外线状沉积沙体特征

许艳; 蔡锋; 卢惠泉; 吴承强; 郑勇玲; 鲍晶晶

doi:10.3969/j.issn.0253-4193.2014.05.016

福建闽江口和九龙江口外线状沉积沙体特征

doi: 10.3969/j.issn.0253-4193.2014.05.016

1.
国家海洋局第三海洋研究所, 福建厦门 361005
2.
国家海洋局第三海洋研究所, 福建厦门 361005;国家海洋局海岛研究中心, 福建平潭 350400

基金项目: 国家自然科学基金——扬子浅滩南部地形地貌精细研究及成因分析（41276058）；东沙群岛北部海域地形特征命名示范应用研究（201205004-4）。

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出版历程
- 收稿日期: 2013-04-26
- 修回日期: 2013-09-09

The characteristics of linear sands off Minjiang Estuary and Jiulongjiang Estuary in Fujian,China

1.
Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China
2.
Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China;Island Researoh Center, State Oceanic Administration, Pingtan 350400, China

摘要

摘要: 福建沿海强潮河口闽江口和九龙江口外均发育有一定规模的线状沉积沙体，通过多波束调查采集数据和浅剖、沉积物资料的分析，对此类沙体特征进行研究，初步认为其为潮流沙脊。结果表明：在平面分布上，闽江口外潮流沙脊走向近SW-NE向，沙脊局部连片；九龙江口外沙脊走向近ENE-WSW向，沙脊末端有分叉现象。分析现代海洋环境作用并结合沙脊规模、水深和河口相对关系的研究显示，沙脊主体规模基本稳定，现代水动力仅对沙脊表面有改造作用。在潮流、波浪和近岸余流的共同作用下沙脊脊顶部略显平滑，两翼坡度较缓，其沉积物组成以粒度较粗的古河口砂质浅滩砂为主，沉积主体为全新世海平面上升时期，近岸河口环境的古水下三角洲遭受潮流侵蚀而成。
- 潮流沙脊 /
- 地貌特征 /
- 闽江口外 /
- 九龙江口外
Abstract: A certain scale of linear submarine sands which are referred to as tidal sand ridges occurs off the Minjiang Estuary and the Jiulongjiang Estuary in Fujian. Based on the survey data by multi-beam acoustic sounding,sub-bottom profile as well as sediment grain sizes analysis,we studied the features of the tidal sand ridges. The results show that the sand ridges off the Minjiang Estuary are oriented NE-SW,and some of them are connected. The sand ridges off the Jiulongjiang Estuary are oriented ENE-WSW,and some appear to diverge on the end. According to the analysis of marine hydrodynamic environment affects,and the relation among the ridges scale,depth and relative distance to the estuary,the main body of the sand ridges is basically steady. They have been reformed by the recent hydrodynamics as evidenced by similar sand waves on both sides of flanks. The interaction by recent tidal current,wave and residual current leads to a relatively smooth surface on top and both flanks of the sand ridges. It's indicated that the tidal sands primarily originated from estuarine coarse sandy shoals on the paleo-channel system and were subsequently modified into the linear forms during the period of Holocene transgression when sea-level rise was decelerated.
- tidal sand ridges /
- geomorphic features /
- Minjiang Estuary /
- Jiulongjiang Estuary

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