2010 Fiscal Year Final Research Report
Research on geoenvironmental dynamics of coastal and alluvial lowlands
| Project/Area Number |
19300308
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geography
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| Research Institution | Nagoya University |
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Principal Investigator |
UMITSU Masatomo Nagoya University, 文学部, 教授 (50127883)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMURA Toshio 名古屋大学, 年代測定総合研究センター, 教授 (10135387)
NAGASAWA Ryota 鳥取大学, 農学部, 教授 (40314570)
OKUNUKI KeiーIchi 名古屋大学, 大学院・環境学研究科, 准教授 (90272369)
HORI Kazuaki 名城大学, 理工学部, 准教授 (70373074)
ONO Eisuke 新潟大学, 人文社会・教育科学系, 准教授 (90432228)
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| Project Period (FY) |
2007 – 2010
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| Keywords | 沖積低地 / 微地形 / 地形環境 / 自然災害 / GIS |
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| Research Abstract |
In this study, we discussed on the evolution and geo-environment of alluvial and coastal lowlands in relation to natural disasters and environmental change. The landforms of the alluvial lowlands have developed in response to sealevel and climate changes during the postglacial age.
The Tsugaru, Noubi and Echigo plains were the target plains, and the sedimentation rate and the evolution process of the alluvial lowlands were discussed by 10^3 or 10^2 years.
As a result, it was found that the eruption of Towada had a great influence on the geo-environmental change in the flood plain formed by the Iwaki river and its tributaties. The aggradation of flood plain sediments in the Nobi and Tenryu plains progressed after the culmination of the Holocene transgression. In the Echigo plain, the rate of the sedimentation is almost equivalent to the Holocene sealevel rise. The sedimentation rate of natural levees in the Nobi plain is about 10 times larger than that of the flood basin.
Flood condition a
… More
nd micro-landforms of the flood plain were studied about in the plains of Thailand and Java. Flood level based on the images of RADARSAT was analyzed in relation to the topography. Based on the analysis, good relationship between flood condition and the seasonal variation of the paddy-rice planting pattern were clarified in the flood plain of central Thailand.
Landform classification based on SRTM-DEM data and satellite images were done in the Thu Bon alluvial plain, central Vietnam. Good relationship between the flood condition and the topography of the plain were clarified and shown with GIS. Furthermore, formation of the acid sulfate acid soil in the Lower Central Plain, Thailand was discussed. And it was made clear that the distribution of acid sulfate soils is related to the distribution of mangrove forest which developed along the extended coastline during the middle Holocene embayment.
As mentioned above, time and spatial dynamics in relation to the formation of alluvial lowland were clarified, and the relationship between the geo-environmental dynamics in alluvial and coastal plains and various issues as to natural disasters and human habitation in the lowlands were shown in this study. In addition, several researches for this study were done particularly in Southeastern Asian areas and the result may be able to contribute to the local people. Less
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