摘要
航道疏浚是海岸带人类活动的重要形式之一,对近岸海洋环境有着重要的影响。本研究以葫芦岛航道疏浚为例,通过X射线衍射物相分析、放射性同位素分析和激光粒度分析等方法,对航道疏浚区及邻近海域沉积物进行了系统的研究,结果表明:(1)航道疏浚产生的沉积物与现在海底沉积物在粒度组成、黏土矿物组合和210 Pb、137 Cs放射性强度等方面具有显著的差异,可以作为示踪航道疏浚物质扩散和影响范围的指标;(2)葫芦岛海域的航道疏浚物在潮流的作用下沿西北和西南2个方向扩散,不同程度地加入到表层沉积物中,个别地方疏浚沉积物直接覆盖到原沉积物之上,导致海底原地沉积物属性的改变。
As an important human activity in coastal zone, channel dredging has a prominent impact on inshore marine environment. This study took the dredging in the Huludao harbor for example, employed analyses of X-ray diffraction, radioactive isotope and grain size to figure out the characteristics of the sedi-ments in dredging position and its adjacent areas. The results show that, there is significant variation in grain size , clay mineral composition and radioactive isotope distribution of ^210Pb and ^137 Cs between the dredged material and normal submarine sediments, and these differences could be indicators to trace the migration path and influenced area of the dredged material, the dredged material was transported north- westwards and southeastwards under the action of tides, which resulted in mixing with the surface sedi- ments in varying degrees or/and even covered the surface sediment directly in some regions and thus changed the submarine sedimentary characteristic.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第10期88-96,共9页
Periodical of Ocean University of China
基金
国家海洋局公益性项目(201105003-06)
国家重大基础研究发展计划项目(2010CB9512)资助
关键词
航道疏浚
近岸沉积
沉积物
人类活动
葫芦岛
channel dredging
inshore sedimentation
human activity
sediment
Harbor Huludao
