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| An Approach on the Formation Causes of Coastal Sand Dunes |
| Wang Ying, Zhu Dakui |
| Department of Geo and Ocean Science, Nanjing University |
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Abstract A sand dune coast, extended 45 km in the north part of the Luanhe River delta plain (39°25'-39°47'n) is biggest one in China, with the trend parallel to coastline, it's 1-4km wide.The average height of sand dunes is about 25m, the highest peak located near Qilihai in the middle section being 42m. sand materials consist of medium-fine sand with high roundness and heavy mineral assemblage is similar to the Luanhe River sediments. According to 14C dating, it is believed that the sand dune coast north of the Luanhe River delta was formed during the Holocene lower sea level under the influence of Arctic climate. Coastal Zone is a special area with the meteorologic and hydrologic factors which differ from both terrestrial and oceanic settings. It is also the area with strong interation between land and sea, and the sand dune coast might be an effeetive example showing the interaction. As sand dune coast develops, strong prevailing on land winds blow large amount of sand up from sea shore; medium tidal range and gentle coastal slope are also the basic factors to improve the developing of sand dunes. However, during cold phases of Holocene under the Arctic climate influence, it offers a better environment to satisfy all the factors for sand dune development.
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Published: 20 September 1987
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1987, Vol. 7 
