| 深圳大鹏半岛南岸西冲海滩的沉积物来源、平面形态稳定性及横向变化 |
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| 作者姓名： | ZHANG Song WANG Wei HUANG Rihui XU Liubing |
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| 作者单位： | Shenzhen Dapeng Peninsula National Geopark Administration Office, Shenzhen 518121, China,Geographic School, South China Normal University, Guangzhou 510631, China,Geographic School, South China Normal University, Guangzhou 510631, China,Geographic School, South China Normal University, Guangzhou 510631, China |
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| 基金项目： | Shenzhen Dapeng Peninsula National Geopark Project of China under contract No.340775，the Natural Science Foundation of Guangdong Province of China unde contract No. S2012010008610，the National Natural Science Foundation of China under contract No.40871020 |
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| 摘 要： | The coast of the Dapeng Peninsula has been honored as one of "the eight most beautiful coasts in China". The most precious tourism resource for the peninsula is headland bay beaches, among which the beach at Xichong on the southern coast of the peninsula is the longest and the most important one. The information of the stability, sedimentary source and shape change of the beach is very important for maintaining the beach in terms of sustainable development of the peninsula. Heavy minerals in the sand of the beach and the inland stream at Xichong are compared with those of a nearby beach on the same coast to determine the beach sand source; with help of a computer software, MEPBAY, the equilibrium planforms of the beaches on the peninsula are compared with those of an island without rivers to evaluate the stream’s effects on the beach stability; cross shore profiles along the Xichong beach are also surveyed in different seasons of a year to assess the annual shore normal beach changes affected by the stream input, and the relation between the equilibrium planform state and cross shore changes of the beach. It is shown that(1) stream is the main sedimentary source of the beach and the weathering materials of the rocky headlands on both sides of the bay transported by waves are the second source for the beach but it is limited, sand from an inner shelf is not the sedimentary source for the beach at present and was not even during the Holocene transgression;(2) the Xichong beach cannot reach static equilibrium around the entire bay shoreline, the segment of the shoreline where a stream outlet is located is in dynamic equilibrium, and the unstable section occurs in the wave shadow region in the lee of an offshore island;(3) no matter whether the section of the beach shoreline at Xichong is in an equilibrium state or not, it is eroded in the typhoon season and recovered after the season, the maximum change in erosion and accretion occurs in the unstable segment;(4) the Xichong beach can only have small sand body since it is supplied with sand mainly form inland streams, resulting in a possible danger in which sand loss induced by human activities or huge storms cannot be replenished naturally.
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| 关 键 词： | headland bay beach sedimentary source beach stability beach seasonal change Dapeng Peninsula |
| 收稿时间： | 2014/2/22 0:00:00 |
| 修稿时间： | 8/5/2014 12:00:00 AM |
The sedimentary source, planform stability and shore normal morphological change of the Xichong beach on the southern coast of the Dapeng Peninsula of Shenzhen, Guangdong Province, China |
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| ZHANG Song,WANG Wei,HUANG Rihui,XU Liubing.The sedimentary source, planform stability and shore normal morphological change of the Xichong beach on the southern coast of the Dapeng Peninsula of Shenzhen, Guangdong Province, China[J].Acta Oceanologica Sinica,2015,34(3):76-89. |
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| Authors: | ZHANG Song WANG Wei HUANG Rihui and XU Liubing |
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| Institution: | 1.Shenzhen Dapeng Peninsula National Geopark Administration Office, Shenzhen 518121, China2.Geographic School, South China Normal University, Guangzhou 510631, China |
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| Abstract: | The coast of the Dapeng Peninsula has been honored as one of “the eight most beautiful coasts in China”. The most precious tourism resource for the peninsula is headland bay beaches, among which the beach at Xichong on the southern coast of the peninsula is the longest and the most important one. The information of the stability, sedimentary source and shape change of the beach is very important for maintaining the beach in terms of sustainable development of the peninsula. Heavy minerals in the sand of the beach and the inland stream at Xichong are compared with those of a nearby beach on the same coast to determine the beach sand source; with help of a computer software, MEPBAY, the equilibrium planforms of the beaches on the peninsula are compared with those of an island without rivers to evaluate the stream's effects on the beach stability; cross shore profiles along the Xichong beach are also surveyed in different seasons of a year to assess the annual shore normal beach changes affected by the stream input, and the relation between the equilibrium planform state and cross shore changes of the beach. It is shown that (1) stream is the main sedimentary source of the beach and the weathering materials of the rocky headlands on both sides of the bay transported by waves are the second source for the beach but it is limited, sand from an inner shelf is not the sedimentary source for the beach at present and was not even during the Holocene transgression; (2) the Xichong beach cannot reach static equilibrium around the entire bay shoreline, the segment of the shoreline where a stream outlet is located is in dynamic equilibrium, and the unstable section occurs in the wave shadow region in the lee of an offshore island; (3) no matter whether the section of the beach shoreline at Xichong is in an equilibrium state or not, it is eroded in the typhoon season and recovered after the season, the maximum change in erosion and accretion occurs in the unstable segment; (4) the Xichong beach can only have small sand body since it is supplied with sand mainly form inland streams, resulting in a possible danger in which sand loss induced by human activities or huge storms cannot be replenished naturally. |
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| Keywords: | headland bay beach sedimentary source beach stability beach seasonal change Dapeng Peninsula |
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