Earth Surface Movement Inferred from Grain-size Variation in Pond Sediments

从池塘沉积物的粒度变化推断地球表面运动

• 批准号: 01540341
• 负责人: KASHIWAYA Kenji
• 金额: $ 1.34万
• 依托单位: The Graduate School of Science and Technology, Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01540341/
• 关键词: Mass movement; Man-made landform; Pond sediment; Grain size; Heavy rainfall; 地形改変地; 粒度分析; X線写真

Grain-size analysis of pond sediments in the Rokko Mountains shows that years of heavy rainfalls can traced in the grain-size sequences for the past 50 years. These years show up as prominent coarsenings in the grain-size distribution. This coarse layer was used to cross date undated sediment to dated sediment in the heavy rainfall area in the mountains. Sediment from a pond somewhat distant from the area was cross-dated to sediment in the mountain pond by the use of peak values of ^<137>Cs data. Changes in grain-size distribution show differences in the erosional and sedimentary environments of the ponds in the mountain area and in the area just to the west of the mountains ; prominent coarsening severe heavy rainfall area and non prominent coarsening in less heavy rainfall areas that are correlated with rainfall distribution in times of heavy rain. These results show that grain-size analysis can provide a very useful tool for reconstructing the erosional environments during the past 10^1-10^2 years.

通过对六廓山池塘沉积物的粒度分析，发现在过去50年的粒度序列中，存在着重砂年份。这些年份在粒度分布上表现为显著的粗化。在山区强降雨区，利用该粗层进行了年代际沉积物与年代际沉积物的交叉。通过使用^ Cs数据的峰值，将距离该地区稍远的池塘沉积物与山区池塘的沉积物交叉定年<137>。粒度分布的变化表明，山区和山区西侧的池塘侵蚀和沉积环境不同，强降水区粗化明显，弱降水区粗化不明显，这与暴雨时的降水分布有关。这些结果表明，粒度分析可以为重建近10^1-10^2年的侵蚀环境提供一个非常有用的工具。

项目成果

Kashiwaya, K: "Postdiction of erosional environment on the basis of grain-size analysis of bottom sediments" Journal of Geography. 98. 31-36 (1989)

Kashiwaya，K：“基于底部沉积物粒度分析的侵蚀环境后预测”地理学杂志。

KASHIWAYA,K.: "Landslide Environment Interred from Grainーsize Variation in Pond Sediments" Earth Surface Processes and Landforms. 15. (1990)

KASHIWAYA, K.：“根据池塘沉积物的粒度变化来研究滑坡环境”地球表面过程和地貌 15。（1990）。

Kashiwaya, K: "Grain-size variation of lake sediments and past erosional environment" Jour. Sed. Soc. Japan. 32. 25-28 (1990)

Kashiwaya，K：“湖泊沉积物的粒度变化和过去的侵蚀环境”Jour。

柏谷健二: "堆積物の粒度組成の分析と侵食環境の推定" 地学雑誌. 98. 31-36 (1989)

Kenji Kashiwaya：“沉积物粒度组成分析和侵蚀环境估计”地质杂志 98. 31-36 (1989)。

柏谷 健二: "湖沼堆積物の粒度組成の変動と過去の侵食環境" 堆積学研究会報. 32. 25-28 (1990)

Kenji Kashiwaya：“湖泊沉积物颗粒尺寸组成的变化和过去的侵蚀环境”沉积学研究公报 32. 25-28 (1990)。