17:15 〜 19:15
[HGM04-P14] Holocene coastal dunes evolution in the Tainan alluvial plain, southwestern Taiwan
キーワード：Coastal dunes, Aeolian activity
Coastal dune is an important part of the coastal system. When confronting the impacts of climate change, understanding the dynamic environment and long-term evolution of the coasts can lead to sustainable use of the coastal areas.
Previous studies of coastal dune in the East Asia have shown that the Holocene coastal dunes of Fujian mainly developed in the regression period since 3 ka, and the main accumulation period was 0.8 ka. Moreover, the coastal dunes in the southwestern of Korea and Japan were mainly formed between 8 ka and 5 ka. In particular, according to the dating results of the Tottori sand dunes in Japan, it was found that there was an aeolian interruption in the late Holocene, and the accumulation began again after the 15th century, and the dunes began to move landward after the 17th century.
Furthermore, there are also many coastal dunes in Taiwan, but the research on the evolution of sand dunes mostly focuses on the eastern Taiwan. For example, the Fulong dunes in the northeastern Taiwan were formed between 3 ka and 0.7 ka, while the Feng-Chuei-Sha and Gangkou dunes in the southeastern Taiwan began to form from 4 ka and 2.5 ka. However, these sites are all adjacent to hilly areas with limited coastal hinterland, so it is difficult to observe the migration of coastal dunes during the Holocene regression period. In contrast, the Tainan alluvial plain in the southwestern part of Taiwan is flat and vast. In addition to many developing coastal dunes, previous studies also observed many remnants of paleodunes in the inland area, but the evolution process of these paleodunes is still unknown.
We used petrol hammer window sampling system to extract sub-surface profiles of Shalun and Tainan paleodune fields, which located on the Tainan alluvial plain. By analysis the sedimentary environment, grain size analysis and carbon-14 dating data from the core profile, evolution of the paleo-coastline along the Tainan alluvial plain during the Holocene will be revealed.
Previous studies of coastal dune in the East Asia have shown that the Holocene coastal dunes of Fujian mainly developed in the regression period since 3 ka, and the main accumulation period was 0.8 ka. Moreover, the coastal dunes in the southwestern of Korea and Japan were mainly formed between 8 ka and 5 ka. In particular, according to the dating results of the Tottori sand dunes in Japan, it was found that there was an aeolian interruption in the late Holocene, and the accumulation began again after the 15th century, and the dunes began to move landward after the 17th century.
Furthermore, there are also many coastal dunes in Taiwan, but the research on the evolution of sand dunes mostly focuses on the eastern Taiwan. For example, the Fulong dunes in the northeastern Taiwan were formed between 3 ka and 0.7 ka, while the Feng-Chuei-Sha and Gangkou dunes in the southeastern Taiwan began to form from 4 ka and 2.5 ka. However, these sites are all adjacent to hilly areas with limited coastal hinterland, so it is difficult to observe the migration of coastal dunes during the Holocene regression period. In contrast, the Tainan alluvial plain in the southwestern part of Taiwan is flat and vast. In addition to many developing coastal dunes, previous studies also observed many remnants of paleodunes in the inland area, but the evolution process of these paleodunes is still unknown.
We used petrol hammer window sampling system to extract sub-surface profiles of Shalun and Tainan paleodune fields, which located on the Tainan alluvial plain. By analysis the sedimentary environment, grain size analysis and carbon-14 dating data from the core profile, evolution of the paleo-coastline along the Tainan alluvial plain during the Holocene will be revealed.