No.129 研究課題 / Project
多摩川の洪水と環境変動－近世多摩川洪水史と完新世段丘－Tama River floods and the environmental changes - the modern history of floods in the Tama River since the sixteen century, and terraces of Holocene.| 一般研究 General Research |
No.129 |
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| 代表研究者 Principal Investigator |
増渕 和夫 Kazuo Masubuchi |
| 所属（採択当時） Affiliation |
多摩川流域自然史研究会代表 Representative, Society for Study of Tamagawa Nature History |
| 研究内容要約 Research Summary |
Ｉ．晩氷期の洪水が秋留台地形成に果たした役割の解明 野外調査とボーリング資科の検討から、秋留台地の秋留原面を構成する立川ローム層を覆って、堆積する一連の氾濫性堆積物を認め、これを秋留原層と仮称した。秋留原層の堆積時期と分布を明らかにし、晩氷期の洪水が秋留台地形成に果たした役割を解明した。 Ⅱ．多摩川低地上流部右岸落川における古墳時代の洪水氾濫 洪水氾濫によって形成された完新世段丘群の露頭観察から、完新世段丘群の形成に果たした多摩川、浅川の洪水氾濫の役割を解明。 Ⅲ．多摩川低地上流部左岸調布染地における縄文時代晩期以降の洪水氾濫と自然堤防の形成弥生時代～古墳時代にかけて、当地域は洪水氾濫を受ける場であり。この洪水氾濫によって、自然堤防が形成され、古代に至って、人間に生活の場を与えることになった。 Ⅳ．近世洪水史と洪水特性と環境変動 文献資科に基づく洪水史資料の集積を進め、その解析から、多摩川の洪水特性を明らかとし、環境変動との関連を考察した。 I. Role of floods during the last glacial period in the formation of Akiru Plateau We carried out field surveys and examined soil boring data. Then we discovered that Tachikawa Loam Formation, which is a component of Akirubara Layer, is widely covered with flood deposits, and was tentatively named Akirubara Formation. We analyzed the sedimentation time and the distribution of Akirubara Formation, and examined the role of floods during the last glacial period in the formation of Akiru Plateau. II. Inundations during the Tumulus period (from late 3rd Century to 7th Century) in the Ochigawa Region on the lowlands on the right side of the upper Tama River We observed strata outcrops of the Holocene Terrace Group that was formed due to inundations, and elucidated the role of the inundations of the Tama and Asaｇawa rivers in the formation of the Holocene Terrace Group. III. Inundations after the Last Jomon period (from BC 10th Century to BC 4th Century) in Chofu-somechi Region in the lowlands on the left side of the upper Tama River, and the formation of natural levees Between the Yayoi period (from BC 4th Century to 3rd Century) and the Tumulus period, this area suffered from frequent inundations, which contributed to the formation of natural levees. As a consequence, the area became suitable for people’s settlement. IV. History of flooding in the Modern period, characteristics of flooding, and environmental variations We collected and analyzed documents regarding the history of flooding. Then, we clarified the characteristics of flooding of the Tama River , and discussed its relationship with environmental variations. |
| 共同研究者 Collaborators |
藤澤正一・佐々孝・向山静夫・曾原利満 |
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