Quantitative study of morphological features and control factors of seabed pockmarks in the North Yellow Sea

Liu Xiaoyu; Feng Xiuli; Chen Yilan; Tang Qiuhua; Liu Lejun; Lu Bo; Jiao Pengfei

doi:10.3969/j.issn.0253-4193.2018.03.004

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Liu Xiaoyu, Feng Xiuli, Chen Yilan, Tang Qiuhua, Liu Lejun, Lu Bo, Jiao Pengfei. Quantitative study of morphological features and control factors of seabed pockmarks in the North Yellow Sea[J]. Haiyang Xuebao, 2018, 40(3): 36-49. doi: 10.3969/j.issn.0253-4193.2018.03.004

Citation:

Liu Xiaoyu, Feng Xiuli, Chen Yilan, Tang Qiuhua, Liu Lejun, Lu Bo, Jiao Pengfei. Quantitative study of morphological features and control factors of seabed pockmarks in the North Yellow Sea[J]. Haiyang Xuebao, 2018, 40(3): 36-49. doi: 10.3969/j.issn.0253-4193.2018.03.004

Citation:

Liu Xiaoyu, Feng Xiuli, Chen Yilan, Tang Qiuhua, Liu Lejun, Lu Bo, Jiao Pengfei. Quantitative study of morphological features and control factors of seabed pockmarks in the North Yellow Sea[J]. Haiyang Xuebao, 2018, 40(3): 36-49. doi: 10.3969/j.issn.0253-4193.2018.03.004

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Quantitative study of morphological features and control factors of seabed pockmarks in the North Yellow Sea

doi: 10.3969/j.issn.0253-4193.2018.03.004

1.
Key Laboratory of Submarine Geosciences and Prospecting Techniques, Ministry of Education, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China;The First Institute of Oceanography, State Oceanic Adminsitration, Qingdao 266061, China
2.
Key Laboratory of Submarine Geosciences and Prospecting Techniques, Ministry of Education, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China
3.
The First Institute of Oceanography, State Oceanic Adminsitration, Qingdao 266061, China
4.
National Marine Environmental Monitoring Center, Dalian 116023, China

Received Date: 2017-05-05

Abstract

Abstract

Based on the high-resolution multi-beam bathymetry and backscatter intensity data, this study calculated the morphological parameters of the seabed pockmarks in the North Yellow Sea and carried out quantitative analysis. Combined with the water depth, terrain slope and the back-scattering intensity data, the outline of the seabed pockmarks were accurately defined, and 282 pockmarks were identified which have circle, elliptic, or elongated shape in the plan view. By using ArcGIS software, the morphological parameters of the pockmarks were calculated and analyzed, the average long axis and short axis were 1.36 km and 0.78 km respectively, the average diameter were 0.94 km, average area and the average circumference were 0.88 km² and 3.82 km, the pockmarks also have a aspect ratio of 1.83, average relief of 0.3 m to 2.5 m, and the average area concentration 13%, profile shapes of the pockmarks have W1, W2 and V type three categories, distributed in the north, south, and west of the pockmark group respectively. The large plane size but small vertical scale may be associated with the low concentration of the fluid, the external forces such as earthquake, tsunami or storm may also induced the formation as a trigger. The orientation of the major axis of the pockmarks aligned around ENE-WSW, NNE-SSW direction, consistent with the main direction of the bottom current in the study area. Some pockmarks string arranged along the same direction as the long axis, which shows that the development of the pockmarks may be controlled by the sedimentary strata as ancient river, or ancient lagoon etc. Acoustic backscatter strength of the area ranges from -60 dB to -71 dB, the data inside the pockmarks significantly higher than that of the outside, the average difference up to 5 dB, the high backscatter strength may attribute to the coarse sediments that left inside the pockmark due to winnowing of fine-grained sediments, or result of the precipitation of diagenitic or authigenic minerals associated with fluid venting.
- pockmark,
- landform,
- morphology,
- the North Yellow Sea,
- multibeam

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References(38)

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