Submarine geomorphologic features and genetic mechanism in the Xuande atoll, Xisha Islands

He Qijiang; Liu Gang; Wang Xuemu; Zheng Zhifeng; Duan Ke; Han Xiaohui; Shen Aisi

doi:10.12284/hyxb2021078

Volume 43 Issue 8

Aug. 2021

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He Qijiang，Liu Gang，Wang Xuemu, et al. Submarine geomorphologic features and genetic mechanism in the Xuande atoll, Xisha Islands[J]. Haiyang Xuebao，2021, 43(8)：81–92 doi: 10.12284/hyxb2021078

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Submarine geomorphologic features and genetic mechanism in the Xuande atoll, Xisha Islands

doi: 10.12284/hyxb2021078

He Qijiang^{1, 2
,},
Liu Gang^{1, 2
,
,},
Wang Xuemu^{1, 2},
Zheng Zhifeng^{1, 2},
Duan Ke³,
Han Xiaohui^{1, 2},
Shen Aisi^{1, 2}

1.
Key Laboratory of Marine Geology Resources and Environment of Hainan Province, Haikou 570206, China
2.
Marine Geological Survey Institute of Hainan Province, Haikou 570206, China
3.
HuBei Geological Survey, Wuhan 430034, China

Received Date: 2020-05-16
Rev Recd Date: 2020-10-20

Available Online: 2021-04-20

Publish Date: 2021-08-25

Abstract

Abstract

The submarine topographic features and distribution types of the Xuande atoll in the Xisha Islands have important indications for the influence of regional geological structure, sea level rise and fall, and ocean hydrodynamics. In order to study the submarine topography and geomorphology of the Xuande atoll, we detailed survey in the Xuande atoll of the Xisha Islands, including side scan sonar, single-beam sounding, and surface sediment sampling. The results show that: (1) Xuande atoll is a type of incomplete atoll, with lagoon deposits in the middle, and four water channels with a water depth of about 60 m had been divided, namely, the gate of the Xishazhou at the northwest of the atoll, the “Red Grass Gate” of the Nanshazhou-Yongxing, the gap on the west side of the atoll, and the gap on the south side of the atoll; (2) according to the geomorphic features, the underwater geomorphic types of the Xuande atoll are divided into 3 grades and 11 types of grades classification systems. The dynamic geomorphology units such as sand waves and grooves in the study area show that the submarine features in the shallow water area of Xuande atoll are controlled by prevailing monsoons and wave sites. The tidal channel water body formed by the deep water entrance is the main factor shaping the dynamic geomorphology of the Xuande atoll lagoon area. There are six levels of underwater terraces on the seaward slope in the southeastern part of the study area. By comparing the characteristics of the coral reef terraces in the South China Sea, the genesis of the seaward slope terraces on the Xuande atoll is likely to be a combination of global sea level changes and crustal subsidence.
- side scan sonar,
- submarine geomorphologic features,
- classification system,
- Xuande atoll

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References(42)

References

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