Sediment transport patterns in the eastern Beibu Gulf based on grain-size multivariate statistics and provenance analysis

XU Zhi-wei; WANG Ya-ping; LI Yan; MA Fei; ZHANG Fan; YE Chang-jiang

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Article Navigation > Haiyang Xuebao > 2010 > 32(3): 67-78

XU Zhi-wei, WANG Ya-ping, LI Yan, MA Fei, ZHANG Fan, YE Chang-jiang. Sediment transport patterns in the eastern Beibu Gulf based on grain-size multivariate statistics and provenance analysis[J]. Haiyang Xuebao, 2010, 32(3): 67-78.

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Sediment transport patterns in the eastern Beibu Gulf based on grain-size multivariate statistics and provenance analysis

1.
School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210093, China
2.
School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210093, China;Key Laboratory of Ministry of Education for Coast and Island Development, Nanjing University, Nanjing 210093, China
3.
Joint Key Laboratory of Fujian Province and Ministry of Education for Marine Environmental Science, Xiamen University, Xiamen 361005, China

Received Date: 2009-04-13
Rev Recd Date: 2009-11-25

Abstract

Abstract

Sediment samples collected from the eastern Beibu Gulf were analyzed in the laboratory to obtain grain-size distributions and mineral components. Four main control factors are obtained using a factor analysis. Factor 1 is contributed by 2.5Φ-3.75Φ and 5.75Φ-7.75Φ. Factor 2 respects fine suspended load component, indicating that the provenance contribution from the Qiongzhou Strait and the high score area is consistent with the weak circulation. Factor 3 is a indicator of terrigenous coarse bedload component from the west and northwest coast of the Beibu Gulf. Factor 4 can reflect the transportation by the coastal current along the east coast off Hainan Island and the west of Guangdong Province. The study area can be separated into four subareas of the sediment sources on the basis of heavy mineral analysis. A grain-size trend analysis model is separately used for the four subareas to estimate the net sediment transport pathways, which can remove the affects induced by the sediment mixing from different sources. A converge center of grain-size trend vectors in the area of the west of Hainan Island might result from the mixing of different sources of sediments, instead of sediment transport. Actually, the northward transport dominates this area of the west of Hainan Island. Another converge center in the northern area is well agreement with the local geomorphology and large-scale ocean circulation pattern. Thus, the application of grain-size trend should consider the effect of sediment sources and spatial scales in order to derive the reasonable net sediment transport pathways.
- grain size,
- heavy mineral,
- multivariate statistics,
- grain-size trend analysis,
- Beibu Gulf

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