Morphology and Sediments of Coastal Spinifex littoreus Nebkhas on Donghai Island of Guangdong Province, China

doi:10.7522/j.issn.1000-694X.2019.00080

Journal of Desert Research ›› 2019, Vol. 39 ›› Issue (6): 167-176.DOI: 10.7522/j.issn.1000-694X.2019.00080

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Morphology and Sediments of Coastal Spinifex littoreus Nebkhas on Donghai Island of Guangdong Province, China

Feng Miaoyan¹, Dong Zhibao¹, Huang Rihui², Liu Zhengyao¹, Xiao Nan¹, Yang Junhuai¹, Chen Guoxiang¹, Zhu Chunming¹

1. School of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, China;
2. Department of Geography, Lingnan Normal University, Zhanjiang 524048, Guangdong, China

Received:2019-06-05 Revised:2019-09-23 Published:2019-11-14

Abstract

Abstract: Coastal nebkhas are widely distributed in coastal areas of China, however few researches have focused on them, and hence the morphological and the mechanisms of deposition process of coastal nebkhas remain unclear. In this study, we analyzed the shape, spatial location and characteristics of grain size of Spinifex littoreus nebkhas on the Donghai Island of Guangdong Province. The following results have been reached. (1)The nebkhas mostly presents as nearly cones or tadpoles, with a synergistical increasing of their length, width and height. The windward slopes exert great influence on the height of the nebkhas, while the leeward slopes contribute more to the long axis. The coverage of S. littoreus controls the morphology and the volume of nebkhas. (2) The nebkhas is always developed above the tide limit. The characteristics of grain size of the sediment show that the sediment mainly sourced from the nearshore. (3) The RDD is basically consistent with the direction of the long axis of nebkhas, indicating that the sediments of nebkhas is mainly controlled by the onshore wind. (4)High consistence can be observed in the characteristics of grain size of the sediments from nebkhas and foredunes, suggesting that wind-drift sand continuously transported to inland via nebkhas and nebkhas service as "springboards" for the transportation of wind-drift sand and as "connection" for the foredunes.

Key words: nebkhas, morphology, aeolian deposit, Spinifex littoreus, Donghai Island

CLC Number:

P931.9

Feng Miaoyan, Dong Zhibao, Huang Rihui, Liu Zhengyao, Xiao Nan, Yang Junhuai, Chen Guoxiang, Zhu Chunming. Morphology and Sediments of Coastal Spinifex littoreus Nebkhas on Donghai Island of Guangdong Province, China[J]. Journal of Desert Research, 2019, 39(6): 167-176.

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Morphology and Sediments of Coastal Spinifex littoreus Nebkhas on Donghai Island of Guangdong Province, China

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