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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.

本研究旨在从全新世晚期的沉积环境出发，阐明河滨平原微地貌的形成与演化。对Nobi平原的微地貌和沉积物进行了详细的分析。结合平原考古遗址的分布，阐明了平原的演化过程，阐明了平原地貌的发育不是按顺序的，而是根据沉积区域的变化逐级递进的。研究了与叶hagi河低地隐伏林有关的河道和沉积区域的变化。研究了柬埔寨湄公河三角洲上游微地貌及其与洪涝灾害的关系。研究了湄公河三角洲东北部红树林的海岸变化和演化。在距现在海岸线50 ~ 80 km的内陆地区可以看到红树林泥炭，它们的年龄为6000 ~ 7000 cal BR。在6000 cal BP之后，河流沉积物的沉积覆盖了红树林，形成了该地区的河流地貌。以2004年12月26日斯玛特拉特大地震引发的海啸灾害为例，研究了微地貌对洪涝海啸灾害的影响。在泰国南坎海岸平原，发现了上冲和反冲海啸流。平原上厚厚的海啸沉积物在洼地中被视为山脊之间的沟壑。