Sedimentary structure of coastal dunes and evolution of coastal environment in Changle,Fujian,China,by ground- penetrating radar
The east coast of Changle City, Fujian Province, China, is famous for its marvelous coastal dunes. Located to the south of the Min River Estuary, it receives large volumes of sediment from the northeast wind waves and Zhemin coastal currents. Using two parallel lines perpendicular to the shoreline, we applied ground-penetrating radar as a non-invasive technology to determine the sedimentary structure of the coastal dunes. Some preliminary conclusions are as follows: (1) The coastal dunes mainly comprise two parts—wave-deposited beach sands at the bottom capped by aeolian sands, which present hummocky cross stratification and high-angle cross bedding mingled with horizontal bedding, respectively. (2) High-angle cross bedding dipped inversely corresponds to abundant sand sources, a wide beach, and vegetation expansion, which are the characteristics of a progradational coast. (3) On the basis of our sedimentary structure sequence analysis, we infer that two stages occurred in the coastal environment evolution: a shallow sea in the early times and the occurrence and development of coastal dunes.
ground-penetrating radar (GPR)coastal dunesedimentary structurecoastal environmentChangle City
国家科技期刊平台
NSTL
万方数据
维普
