Research on the micro landforms of the coastal and alluvial lowlands in relation to the Holocene geo-environment.

全新世地质环境与滨海冲积低地微地貌的关系研究。

基本信息

批准号：
15300302
负责人：
UMITSU Masatomo
金额：
$ 10.5万
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：
2003
资助国家：
日本
起止时间：
2003 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15300302/
关键词：
Alluvial lowland Micro landforms Natural disaster Tsunami Holocene Mekong Delta Thailand Mangrove forest 堆積物カンボジア平原

项目摘要

Objective of this research is to clarify the formation and evolution of micro landforms of the riverine coastal plains in relation to the sedimentary environments in late Holocene. Detail analysis of the micro landforms and the sediments were done on the Nobi plain. Evolution of the plain was clarified in relation to the distribution of archaeological sites in the plain, and it is clarified that the landforms of the plain developed not in order but step by step according to the change of deposition area. Change of the river course and deposition area was also studied in relation to the buried forest in the Yahagi river lowland.Detail micro landform and its relation to the flooding were studied in the upper stream of the Mekong River delta in Cambodia. Coastal change and evolution of mangroves were also studied in the northeastern Mekong River delta. Mangrove peat can be seen in the area around 50-80 km inland from the present coastline and the ages of them are 6000-7000 cal BR After 6000 cal BP, deposition of fluvial sediments covered mangroves and formed fluvial landforms in the area.Effects of the micro landforms to the flooding and tsunami disaster were also studied especially on the case of the tsunami disaster caused by the giant earthquake off Smatra on December 26, 2004. Run up and back wash tsunami flows were distinguished in the Nam Khem coastal plain, Thailand. Thick tsunami deposits in the plain are seen in the depression as swales between the ridges.

这项研究的目的是阐明与全新世晚期的沉积环境有关的河流沿海平原的微地形的形成和演变。微地形和沉积物的详细分析是在Nobi平原上进行的。平原的演变与平原的考古遗址的分布有关，并澄清说，平原的地面不是按顺序开发的，而是根据沉积区的变化而逐步发展。还研究了与Yahagi河Lowland的埋葬森林有关的河道和沉积区的变化。在湄公河东北河三角洲也研究了红树林的沿海变化和进化。红树林的泥炭可以在距目前海岸线内陆50-80公里左右的区域中看到，其年龄为6000-7000 cal br后，在6000 cal BP之后，河流沉积物的沉积覆盖了河流，并在该地区形成了河流的河流，并在该地区造成了灾难的灾难，尤其是对造成洪水的灾难造成的案例，这是对地球造成的。 2004年12月26日在Smatra之外。在泰国的Nam Khem沿海平原上，奔跑和背面的海啸流了。在山脊之间的锯片中可以看到平原上的厚海啸沉积物。