山东半岛南部丁字湾口外海底沉积物粒度时空变化及影响因素

王伟; 汤世凯; 胡艳萍; 王红艳; 石洪源; 战超

doi:10.16562/j.cnki.0256-1492.2021050601

山东半岛南部丁字湾口外海底沉积物粒度时空变化及影响因素

1.
山东省海洋地质勘查院，烟台 264004

2.
山东省第三地质矿产勘查院，烟台 264004

3.
鲁东大学海岸研究所，烟台 264025

基金项目: 山东省地质矿产勘查开发局项目“山东半岛重点海湾地质环境与开发保护评价”（HJ202101）；山东省财政项目“山东半岛蓝色经济区重点规划区1:5万海岸带综合地质调查（丁字湾）”（鲁勘字(2016)69号）；NSFC-山东联合基金（U1706220）；国家自然科学基金“最近40年来风暴潮对黄河清水沟河口沙嘴地貌演变影响研究”（41901006），“最近50年来莱州湾东部侵蚀砂岸动力地貌演变研究”（41471005）

详细信息

作者简介: 王伟（1981—），男，高级工程师，研究方向为海岸带地质与海岸沉积，E-mail：wangwei-2005@sohu.com

通讯作者: 战超（1986—），女，博士，副教授，研究方向为海岸地貌，E-mail：zhanchao0226@163.com

中图分类号: P736.2

收稿日期: 2021-05-06

修回日期: 2021-09-07

刊出日期: 2022-04-28

Spatio-temporal variation and influencing factors of seafloor sediment grain size off the mouth of Dingzi Bay of Southern Shandong Peninsula

1.
Marine Geological Exploration Institute of Shandong Province, Yantai 264004, China

2.
No.3 Exploration Institute of Geology and Mineral Resources of Shandong Province, Yantai 264004, China

3.
Coast Institute of Ludong University, Yantai 264025, China

More Information

Corresponding author: ZHAN Chao, zhanchao0226@163.com

Received Date: 06 May 2021

Revised Date: 07 September 2021

Publish Date: 28 April 2022

摘要

摘要:
对丁字湾口外浅海区平行海岸线及垂直海岸线方向上的11个柱状沉积物进行了粒度和²¹⁰Pb放射性活度测试，分析了沉积物类型和粒度参数变化特征并计算了沉积速率，结合丁字湾地貌演变、流域人类活动变化，分析了人类活动对丁字湾口外滨海段沉积物粒度演变的影响。海底柱状沉积物可划分7种类型，水平方向上平均粒径Φ值从三角洲中心向四周整体呈现逐渐增大的趋势，垂直方向上平均粒径Φ值呈现不规则变化特征。沉积物分选性属于较好—中等，偏态为近对称—正偏，峰态为尖锐。不同沉积物类型及特征参数揭示沉积时期相应的水动力环境，砂、含砾砂和粉砂质砂及其较小的平均粒径Φ值揭示相对较强的水动力环境，砂质粉砂、粉砂、黏土和泥及其较大的平均粒径Φ值揭示了相对较弱的水动力环境。受不同水动力环境影响，三角洲顶端和前缘平均沉积速率分别为0.51和1.19 cm/a。与1980年前相比，1980年以后人类对滩涂围垦等活动影响强度加大，海湾纳潮空间、入海泥沙流量和流速均减小，在人类影响范围区域内的沉积物颗粒具有总体向上变细的趋势。
- 落潮三角洲 /
- 粒度参数 /
- 沉积速率 /
- 人类活动 /
- 丁字湾 /
- 山东半岛南部
Abstract:
11 columnar sediment samples are collected off the mouth of Dingzi Bay for grain size analysis and ²¹⁰Pb radioactivity measurement. With the results, the sediments are classified and grain size parameters and sedimentation rate calculated. Combined with the geomorphologic evolution of Dingzi Bay and the change in human activities in the Wulong River Basin, the influence of human activities on the evolution of sediment grain size in the coastal section out the Wulong River estuary is discussed. The results suggested that the columnar sediments may be divided into seven types, and the mean grain size (Φ) in the horizontal direction shows a trend of increase from the deltaic center to all directions as well as an irregular pattern in vertical direction. The sediment sorting changes from good to medium, with a near-symmetric-positive skewness and sharp kurtosis. Sediment types and their diagnostic parameters may be used as tools to reveal depositional environments. Sand, gravelly and silty sand and their small Φ-values suggest relatively strong hydrodynamic environments, while sandy silt, silt, clay and mud and their large Φ-values indicate relatively weak hydrodynamic environments. The average sedimentation rate at the top and front of the delta was 0.51 cm·a⁻¹ and 1.19 cm·a⁻¹, respectively. Human activities in beach reclamation and others increased since 1980, which have caused the decrease in tidal space, sediment discharge and velocity into the sea. As the results, the overall trend of sediment particles in the human-influenced area becomes finer.
- ebb tide delta /
- grain size parameters /
- sedimentation rate /
- human activity /
- Dingzi Bay /
- southern Shandong Peninsula

HTML全文

图 1 山东半岛丁字湾地理位置图

Figure 1.

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图 2 丁字湾口外海域柱状样站位分布图

Figure 2.

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图 3 A-B剖面各站位沉积物类型组合

Figure 3.

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图 4 C-D剖面各站位沉积物类型组合

Figure 4.

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图 5 A-B剖面中沉积物粒度参数变化

Figure 5.

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图 6 C-D剖面中沉积物粒度参数变化

Figure 6.

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图 7 钻孔HZ20和HZ24柱状沉积物²¹⁰Pb_ex垂直分布曲线

Figure 7.

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图 8 丁字湾沉积地貌演化示意图

Figure 8.

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表 1 沉积物粒度参数分级^[27]

Table 1. Classification of grain size parameters

分选系数	定性描述	偏态系数	定性描述	峰态系数	定性描述
＜0.35	分选极好
0.35～0.50	分选好	＞1.30	极正偏	＜1.70	很平坦
0.50～0.71	分选较好	0.43～1.30	正偏	1.70～2.55	平坦
0.71～1.00	分选中等	−0.43～0.43	近对称	2.55～3.70	中等（正态）
1.00～2.00	分选较差	−0.43～−1.30	负偏	3.70～7.40	尖锐
2.00～4.00	分选差	＜−1.30	极负偏	＞7.40	很尖锐
＞4.00	分选极差

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