粤东汕头近岸海域灾害地质风险综合评价

左瀚穹; 刘胜; 汪洋; 郭依群; 王万虎; 王洋

doi:10.16562/j.cnki.0256-1492.2022072101

粤东汕头近岸海域灾害地质风险综合评价

1.
中国地质调查局海口海洋地质调查中心，海口 570312

2.
中国地质大学（武汉）地质调查研究院，武汉 430074

基金项目: 中国地质调查局地质调查二级项目“潮汕海岸带综合地质调查”（DD20208013）

详细信息

作者简介: 左瀚穹（1996—），男，硕士研究生，主要研究方向为地质灾害防治，E-mail：499837216@qq.com

通讯作者: 刘胜（1982—），男，硕士，高级工程师，主要从事海洋基础地质研究，E-mail：3034928902@qq.com

中图分类号: P736

收稿日期: 2022-07-21

修回日期: 2022-08-22

刊出日期: 2023-04-28

Comprehensive assessment of disaster geological risk in Shantou coastal waters in eastern Guangdong

1.
Haikou Marine Geological Survey Center, China Geological Survey, Haikou 570312, China

2.
China University of Geosciences (Wuhan), the Institute of Geological Survey, Wuhan 430074, China

More Information

Corresponding author: LIU Sheng, 3034928902@qq.com

Received Date: 21 July 2022

Revised Date: 22 August 2022

Publish Date: 28 April 2023

摘要

摘要:
基于粤东汕头近岸海域地质和地球物理资料，通过对物探数据进行解译，查明了该区域内主要有活动断层、埋藏古河道、浅层气、不规则浅埋基岩等灾害地质类型，并结合层次分析法和模糊数学法建立了以断层、埋藏古河道、浅层气、浅埋基岩为评价指标的风险评价体系，得出海域内的不同区块的风险性等级，共分低、较低、中、较高、高5个等级。研究区超过70%的区域灾害风险不高，高风险区分布在榕江外河口、海门湾南部，主要受埋藏古河道和断层影响。较高—高风险区工程地质条件较差，存在的不良地质条件可能会给海上工程建设带来风险，选址时应尽量避开此类区域。评价结果与已查明的灾害分布特点吻合，对以后海上工程项目施工有一定的参考价值。
- 灾害地质 /
- 风险评价 /
- 模糊数学 /
- 汕头近岸海域
Abstract:
The geological and geophysical data in the coastal area of Shantou, eastern Guangdong were interpreted and analyzed for geohazard assessment. Results show that there are mainly active faults, buried ancient rivers, shallow gas, and irregular shallow bedrock in this area. The geohazard was quantitatively assessed by using the analytic hierarchy process and fuzzy mathematics method. A risk assessment system was built, in which faults, buried ancient rivers, shallow gas, and shallow bedrock were used as assessment indicators, and different weights of them were assigned. According to the principle of maximum membership degree, risk levels of different blocks of the study area were calculated from which five risk levels were divided: very low, low, medium, high, and very high. More than 70% of the study area was in low risk, and the high-risk area was distributed in the Rongjiang River outer estuary and the southern part of Haimen Bay, affected mainly by buried ancient rivers and faults. The engineering geological conditions in the high, and very-high risk areas are poor due to unstable geological setting that should be avoided for site selection. The assessment results are consistent with known distribution of geohazards in the coastal waters of Shantou, indicating that the assessment method is reasonable and feasible, and shall have reference values for future development and disaster prevention in sea areas.
- hazardous geology /
- risk assessment /
- fuzzy mathematics /
- Shantou coastal waters

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图 1 测线分布

Figure 1.

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图 2 海域断裂分布

Figure 2.

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图 3 研究区埋藏古河道分布

Figure 3.

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图 4 研究区浅层气及浅埋基岩分布

Figure 4.

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图 5 断层断距分布

Figure 5.

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图 7 河道埋深分布

Figure 7.

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图 6 河道厚度分布

Figure 6.

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图 8 断层活动时期定量取值分布

Figure 8.

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图 9 评价结果

Figure 9.

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图 10 断层断距单因子分级

Figure 10.

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图 11 河道埋深单因子分级

Figure 11.

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表 1 评价指标权值判别

Table 1. Evaluation index weight discrimination

	断层断距	断层活动时期	古河道埋深	古河道厚度	浅层气	浅埋基岩
断层断距	1	3	3	5	8	8
断层活动时期	1/3	1	1	3	6	6
古河道埋深	1/3	1	1	3	6	6
古河道厚度	1/5	1/3	1/3	1	4	4
浅层气	1/8	1/6	1/6	1/4	1	1
浅埋基岩	1/8	1/6	1/6	1/4	1	1

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表 2 各项指标权值

Table 2. Weight of each indicator

断层断距	断层活动时期	古河道埋深	古河道厚度	浅层气	浅埋基岩
0.43	0.21	0.21	0.09	0.03	0.03

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表 3 评价指标分级

Table 3. Grading of assessment indices

评价指标	V₁	V₂	V₃	V₄	V₅
u₁/m	0～2	2～8	8～14	14～24	＞24
u₂	0	1	2～3	4～5	6
u₃/m	>24	19～24	15～19	12～15	0～12
u₄/m	0～1	1～4	4～7	7～11	>11
u₅/km²	0～0.08	0.08～0.28	0.28～0.58	0.58～1.30	＞1.30
u₆/m	＞13	12～13	10～12	5～10	＜5

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表 4 断层活动时期影响因子

Table 4. Influence factors of fault action period

风险级别	V₁	V₂	V₃	V₄	V₅
0	0	0	0	0	0
1	0	1	0	0	0
2～3	0	0	1	0	0
4～5	0	0	0	1	0
6	0	0	0	0	1

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表 5 各风险等级评价单元个数及占比

Table 5. Number and proportion of risk assessment units

风险等级	评价单元/个	百分比/%
低风险	233	46.05
较低风险	19	3.75
中风险	107	21.75
较高风险	72	14.23
高风险	75	14.82

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表 6 断距及河道埋深单因子高风险等级单元个数

Table 6. The number of single factor high risk grade units of fault distance and river buried depth

风险等级	断距单因子	河道埋深单因子
高风险等级	16个	68个
与综合评价一致为高风险等级	13个	60个

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