摘要
广东省是中国海岸线最长的省份。广东的海岸风沙沉积为典型的热带-亚热带海岸风沙沉积。有关广东全新世海岸风沙沉积分布的调查研究近年来鲜有报道。我们自2013年以来,对广东的全部海岸进行了遥感影像分析、实地野外勘查和室内实验判别研究。结果表明:广东全新世海岸沙丘分布范围广(除珠江三角洲以外均有分布),但规模较小且零散;河流入海口旁侧多有分布,较为典型的是粤东龙江和粤西鉴江。与1994年不同的是,2019年大部分全新世海岸风沙地貌已被人为改造,保留下来的沙丘高度有所降低,沙丘分布范围减小。如揭阳惠来、汕尾陆丰、茂名、湛江吴川、南三岛、东海岛、硇洲岛的海岸风沙地已大部分被水域(鱼塘)、植被、农业用地和建设用地所替代,残留的沙丘或风沙沉积剖面高度也多由曾经的几十米降为几米(除机械挖掘的矿坑外)。仅深圳大鹏西涌和阳江阳西县溪头镇下垌村的海岸沙丘形态保留较为完整。常年偏东风、迎盛行风向展布的开阔海岸以及丰富的沙源是形成广东海岸风沙地貌的有利条件;1994—2019年人类活动与气候变化使广东沙地面积缩小,建设用地、植被覆盖和土地利用率增加。
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 However,unlike the year of 1994,most of the coastal aeolian sands have been replaced by water(e. g. fish pond),vegetation,agricultural land and construction land.For the remaining sand dunes,height of profiles has reduced from more than ten meters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.
作者
白旸
陈佳升
程延
张甜
Bai Yang;Chen Jiasheng;Cheng Yan;Zhang Tian(School of Geography and Tourism,Huizhou University,Huizhou 516007,Guangdong,China;School of Geosciences,East China University of Technology,Nanchang 330013,China;School of Geographical Sciences,Fujian Normal University,Fuzhou 350007,China;Department of Ecology and Agriculture,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China)
出处
《中国沙漠》
CSCD
北大核心
2020年第6期71-81,共11页
Journal of Desert Research
基金
国家自然科学基金项目(41401003)
广东省自然科学基金项目(S2013040011651)。
关键词
海岸风沙沉积
全新世
分布
广东
coastal aeolian deposits
Holocene
distribution
Guangdong
