丁字湾近岸海域表层沉积物粒度特征及沉积动力环境

汤世凯; 于剑峰; 李金鹏; 王伟; 赵辉; 李亨健; 强萌麟; 原帅帅; 顾效源; 史猛

doi:10.16562/j.cnki.0256-1492.2018022703

丁字湾近岸海域表层沉积物粒度特征及沉积动力环境

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

基金项目:
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)

详细信息

作者简介: 汤世凯(1988—)，男，硕士，工程师，主要从事海岸带地质研究，E-mail：tsktop@163.com

通讯作者: 王伟(1981-)，男，高级工程师，主要从事海洋质地勘查及科研工作，E-mail：wangwei-2005@sohu.com

中图分类号: P736.2

周立君编辑

收稿日期: 2018-02-27

修回日期: 2018-05-04

刊出日期: 2019-04-28

Grain size characteristics and dynamic environment of surface sediments on the near shore seabed of Dingzi Bay

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

More Information

Corresponding author: WANG Wei, wangwei-2005@sohu.com

Received Date: 27 February 2018

Revised Date: 04 May 2018

Publish Date: 28 April 2019

摘要

摘要:
根据丁字湾近岸海域126个表层沉积物样品粒度分析结果，对沉积物类型和粒度参数分布进行了总结。在此基础上，利用粒径趋势分析模型(GSTA)和沉积动力判别图解，探讨了表层沉积物的运移趋势及沉积水动力规律。结果表明，丁字湾近岸海域表层沉积物类型共有8种，其中砂、砂质粉砂和粉砂分布最广泛；平均粒径具有从岸向海逐渐变细的特征，分选性、偏度和峰度分别具有较差—差、正偏—极正偏、中等的特征；粒度运移趋势分析反映出湾口海岸附近泥沙由两侧向湾口中心运移，远离海岸泥沙由北西向南东偏东方向运移；沉积动力判别图解揭示出丁字湾海域沉积水动力具有整体较强，由岸向海方向逐渐减弱的特征。
- 沉积特征 /
- 粒度参数 /
- 运移趋势 /
- 水动力强度 /
- 丁字湾
Abstract:
126 surface sediment samples were collected from the near shore seabed of Dingzi Bay in Shandong province for grain size analysis. Grain size parameters of the samples are calculated and sediment types determined. Upon the basis, sediment transport trends were studied using the Gao-Collins Grain Size Trend Analysis (GSTA model). Sedimentary hydrodynamics was defined using Pejrup triangular diagram. Results indicate that there are eight types of sediments in the bay, dominated by sand, sandy silt and silt. The sediments, in general, are getting finer from the shore to the ocean. They are poorly and very poorly sorted, positively and very positively skewed, and moderate in kurtosis. There are two kinds of sediment transport patterns. In the area near the shoreline, the sediment is transported from the coast to the center of the bay, while in the offshore area, sediment moves from the northwest to southeast. Relatively strong sedimentary hydrodynamics occur in the coastal area. It becomes weaker when water gets deeper.
- sedimentary characteristics /
- grain-size parameters /
- grain-size trend /
- hydrodynamic strength /
- Dingzi Bay

HTML全文

图 1 表层沉积物取样位置分布图

Figure 1.

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图 2 丁字湾表层沉积物在Folk分类三角图中的分布

Figure 2.

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图 3 表层沉积物类型分布平面图

Figure 3.

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图 4 表层沉积物粒度参数等值线分布图

Figure 4.

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图 5 表层沉积物运输趋势矢量分布

Figure 5.

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图 6 研究区沉积动力分区三角图

Figure 6.

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表 1 表层沉积物粒度参数分级(据文献[12])

Table 1. Classification of grain size parameters in Dingzi Bay

分选系数σ	定性描述	偏度值Sk	定性描述	峰度值Ku	定性描述
＜0.35	分选极好
0.35~0.50	分选好	-1~-0.3	极负偏	＜0.67	很平坦
0.50~0.71	分选较好	-0.3~-0.1	负偏	0.67~0.90	平坦
0.71~1.00	分选中等	-0.1~0.1	近对称	0.90~1.11	中等(正态)
1.00~2.00	分选较差	0.1~0.3	正偏	1.11~1.56	尖锐
2.00~4.00	分选差	0.3~1	极正偏	1.56~3.00	很尖锐
>4.00	分选极差			>3.00	极尖锐

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表 2 表层沉积物类型粒度参数及组分特征

Table 2. Grain size parameters and composition of surface sediments in Dingzi Bay

沉积物类型	样品数量		平均粒径Mz	分选系数σ	偏度Sk	峰度Ku	粒级组分
沉积物类型	样品数量		平均粒径Mz	分选系数σ	偏度Sk	峰度Ku	砂	粉砂	黏土	砾
砾质泥质砂	1	最大值	-	-	-	-	-	-	-	-
		最小值	-	-	-	-	-	-	-	-
		平均值	1.11	2.92	0.38	1.34	53.57	11.40	5.50	29.53
泥质砂	5	最大值	4.33	2.72	0.80	4.19	87.28	24.85	15.72	0
		最小值	2.85	1.37	0.61	0.81	59.43	5.44	7.28	0
		平均值	3.63	2.10	0.73	2.23	74.94	14.38	10.68	0
泥	5	最大值	7.26	2.52	0.34	0.84	9.30	63.12	37.60	0
		最小值	6.72	2.24	0.17	0.60	2.23	53.85	33.37	0
		平均值	7.10	2.40	0.25	0.73	5.46	59.33	35.21	0
砂质泥	3	最大值	7.11	3.50	0.15	0.92	25.07	55.81	36.98	0
		最小值	6.03	2.58	-0.06	0.80	11.70	45.90	28.49	0
		平均值	6.64	2.92	0.04	0.86	17.49	51.01	31.50	0
砂质粉砂	33	最大值	6.60	2.82	0.56	1.83	47.77	86.54	24.84	0
		最小值	4.55	1.12	-0.07	0.88	10.73	37.44	2.63	0
		平均值	5.66	2.18	0.31	1.10	21.11	63.23	15.66	0
砂	26	最大值	2.90	1.19	0.56	2.90	98.06	6.16	4.53	0
		最小值	0.42	0.32	-0.25	0.74	90.30	0.21	1.10	0
		平均值	2.25	0.63	0.05	1.13	96.43	1.63	1.94	0
粉砂质砂	5	最大值	4.57	2.53	0.60	1.94	88.90	34.82	12.64	0
		最小值	3.01	1.05	0.32	0.97	52.54	7.93	3.06	0
		平均值	3.62	1.70	0.48	1.50	73.36	20.50	6.14	0
粉砂	48	最大值	7.19	2.53	0.56	1.70	9.77	86.42	27.69	0
		最小值	5.65	1.37	0.16	0.80	1.10	63.74	12.48	0
		平均值	6.33	2.13	0.42	1.08	5.65	74.03	20.31	0

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