海岸新月形沙丘移动与形态变化的典型研究

依据2006~2008年连续3 a共9次采用RTK GPS技术与测量方法对一个典型海岸新月形沙丘形态的高精度测量数据,分析了海岸新月形沙丘的移动方向、方式、速度以及形态变化特点。结果表明,海岸新月形沙丘具有缓慢、向陆往复式前进的移动特点,形态变化则具有随季节增减变化中高度、宽度、长度、断面面积与体积增加的加积特征,究其原因是区域风况、海岸地表覆被、沙丘形态及人类活动等共同作用的结果。

Typical Research on the Movement and Topographic Change of Coastal Crescent Dune

A typical coastal crescent dune, located at Feicui island region of Changli Gold Coast in Hebei Province, which is one of the most typical coastal aeolian landform distribution regions in China, was chosen to study the movement and topographic change of coastal crescent dune by use of high-precision RTK GPS measurement technology during 2006 and 2008. The surveying results show that the movement of coastal crescent dune displays the characteristics of slow advancement toward inland in the way of to-and-fro. In 2006-2008, the leeward slope bottom of the coastal crescent dune moved landward with an average speed of 2.80 m/a. The topographic change represents the characteristics of increasing in height, width, length, cross-section area and volume of the coastal crescent dune with seasonal variations. Compared the last surveying with the first time, the height of coastal crescent dune top increased 1.01 m, the width increased 2.30 m, the length increased 9.51 m, the base area increased 2 236.14 m², the area of three transverse sections increased averagely 117.82 m² and the volume of the coastal crescent dune increased by 46 830.0 m³. As a result of different interaction among wind condition, coastal land cover, the height and volume of costal dunes and the human activities in research region, the movement direction, type and velocity of the coastal crescent dune as well as the characteristics of topographic change are different from those of the other regions and other coastal aeolian dunes.