关键词: 海岸风沙沉积, 全新世, 分布, 广东

Abstract:

Guangdong Province has the longest coastline and the widest coastal area in China. The coastal aeolian deposits in Guangdong Province are typical tropical-subtropical coastal aeolian deposits. In recent years， inconvenience is brought to many researchers of coastal aeolian due to few reports on the distribution of Holocene coastal aeolian sand in Guangdong Province. Therefore， since 2013， we have analyzed the costal aeolian sand deposit of Guangdong Province by using remote sensing images， field exploration and laboratory experiment. The results show that the distribution of the Holocene coastal sand dunes in Guangdong matches characteristics summarized by Mr. Wu Zheng. The costal aeolian sand has widely distribution range （except for the Pearl River Delta） with small scale as well as scattered and discontinuous distribution， many distribute on the side of the river estuaries like Longjiang River and Jianjiang River. However， unlike the year of 1994， most of the coastal aeolian sands have been replaced by water （e.g. fish pond）， vegetation， agricultural land and construction land. For the remaining sand dunes， height of profiles has reduced from more than ten meters to several meters （except for mechanically excavated pits） and spatial extent has contracted. Only the coastal sand dunes in Xichong of Shenzhen and Xiadong of Yangjiang have kept typical sand dune forms. We indicated that east wind， open coast and abundant sand source take advantage to the formation of the sand landform of Guangdong coast. However， in the past 25 years， human activities and climate change may be the main reason that reduced the area of sand land in Guangdong， and increased the construction land， vegetation coverage and land use rate.

Key words: coastal aeolian deposits, Holocene, distribution, Guangdong