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Coastal Landform Evolution and Environmental Changein the Late Holocene

全新世晚期滨海地貌演化与环境变化

基本信息

批准号：
11480020
负责人：
UMITSU Masatomo
金额：
$ 9.09万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

This research aims to clarify the late Holocene coastal landform evolution in relation to environmental change especially sea-level change, sediment supply and human impact. Field research were done in whole Japan (Koike, Matsubara) Hokkaido (Ohira) , Shizuoka (Matsubara), Aichi, Mie (Umitsu, Kawase), Okinawa (Hasegawa, Fujimoto) prefectures and Thailand (Fujimoto, Umitsu) and so on. Detail land form evolution was studied in the Tokachi-gawa and Kumozu-gawa lowlands and clarifeid the change of paleo-coastlines. Coastal change and land form evolution was also studied in the Chao Phraya delta, Thailand and Shoalhaven Lowland, Australia. These researches clarified the detail coastal land form evolution in relation to the sediment supply and sea-level change. These relationships werenot well clarified in the former studies. Coral breaching in the Ishigaki Island, Okinawa was studied by Hasagawa, and clarified that the phenomenon relates to the seasonal change of temperature and human activities especially change of land use. Late Holocene sea-level change and carbon concentration in the coastal lowland of Okinawa and Thailand were studied by Fujimoto, and discussed the minor sea-level fluctuation and mangrove peat formation. He clarified that the carbon concentration in the subsurface sediment including mangrove peat is largerthan the trunk and leaf parts. Characteristics of the Japanese coastal land forms were summarized by Koike. Matsubara also discussed on the evolution of Japanese coastal barriers.

本研究旨在阐明晚全新世海岸地貌演变与环境变化，特别是海平面变化、沉积物供应和人类影响的关系。在全日本（小池、松原）、北海道（大平）、静冈（松原）、爱知县、Mie（光、川）、冲绳县（长谷川、藤本）、泰国（藤本、光）等地进行了实地调研。详细研究了土立川和kummozu -gawa低地的地貌演变，阐明了古海岸线的变化。在泰国的湄南河三角洲和澳大利亚的Shoalhaven Lowland也研究了海岸变化和陆地形态演变。这些研究阐明了与泥沙供应和海平面变化有关的沿海陆地形态演变的细节。这些关系在以前的研究中没有得到很好的澄清。Hasagawa研究了冲绳石垣岛的珊瑚破洞现象，明确了这一现象与季节温度变化和人类活动特别是土地利用变化有关。Fujimoto研究了冲绳和泰国沿海低地晚全新世的海平面变化和碳浓度，并讨论了海平面的小波动和红树林泥炭的形成。他澄清说，包括红树林泥炭在内的地下沉积物中的碳浓度大于树干和叶片部分。小池对日本海岸地貌特征进行了总结。Matsubara还讨论了日本海岸屏障的演变。