| 摘要: |
| 为了研究鸭绿江河口地区沉积物的来源和沉积环境, 对不同断面43 个点位表层沉积物进行了采样分析, 通过对沉积物的分类和粒度参数的计算, 探讨了沉积物类型和粒度参数的分布特征及其指示意义。研究结果表明, 鸭绿江河口地区的表层沉积物类型主要为砂、粉砂质砂、砂质粉砂和极少量黏土质粉砂, 其中砂的分布范围最广; 鸭绿江河口地区表层沉积物来源具有多元性和空间差异性, 以河流径流输砂为主体,同时也有浅海表层沉积物的向陆运动, 其中鸭绿江下游地区沉积物来源主要为河流输送, 中水道、西水道、辽东浅滩的沉积物来源既有河流输送又有浅海表层沉积物的向陆运动; 河口不同区域的沉积环境不同, 既有河流径流影响又有海洋潮汐和波浪的影响。研究结果可以为鸭绿江河口系统演变提供研究依据。 |
| 关键词: 鸭绿江口 表层沉积物 粒度 沉积环境 |
| DOI：10.11759/hykx20121118002 |
| 分类号: |
| 基金项目:国家自然科学基金项目(40871019); 辽宁省教育厅项目(L2012471); 辽东学院博士科研启动项目 |
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| Analyses of sedimentary environment according to the characteristics of grain size in surface sediment in the Yalu River Estuary |
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| Abstract: |
| To explore the resources and sedimentary environment of sediment in different areas of the Yalu River Estuary, 43 surface sediment samples obtained from different zone of the Yalu River Estuary were tested and analyzed. Through the computation of average grain size, sorting coefficient and other grain size parameters, distribution of grain size parameters of surface sediment was obtained and analyzed. The result showed that the sorts of surface sediment in the Yalu River Estuary are mainly sand, silty sand, sandy silt and a small amount of clayey silt, the distribution of sand is more widely than others. The resource of surface sediment has the properties of diversity and space difference. The sand transported by river is the primary source, together with the surface sediment’s movement to land of the shallow sea. The sediment in the downstream of the Yalu River comes from the river transport, the sediment in the middle branch channel, western branch channel and Liaodong shoal of the Yalu River comes from the river’s transport and the movement to land of the surface sediment in shallow sea. The sedimentary environment in different areas is diverse and it is influenced by the Yalu River’s runoff and the tides and waves of seas. The result of this study can provide evidence for the investigation to the Yalu River Estuary’s system evolutions. |
| Key words: the Yalu River Estuary surface sediment grain size sedimentary environment |
