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Changes of Slope Stability in the Mountains during the Holocene, viewed from Inorganic Content and Decomposition Degree of Peat Deposites.

从泥炭沉积物无机含量和分解程度看全新世山地边坡稳定性变化

基本信息

批准号：
02680201
负责人：
SOHMA Hidehiro
金额：
$ 1.47万
依托单位：
Nara Women's 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：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

In the report, features of deposits at three peatlands are discussed. One(Gakinotanbo)is situated in the snow-rich Northern Japanese Apls, and others(Okamekie peatland and Oodai-ga-hara)are in the Kii Mountains where have a little snowfall in winter season.Results are summerised sa follows :(1)12000yr. B. P. to 8000yr. B. P.Peat began to deposit at the Gakinotanbo Peatland. Severe mudfolws from the outside of the peatland frequently occvred during this period, which suggests unstable slope conditions in the Northern Japanese Apls.(2)8000yr. B. P. to 3-4000yr. B. P.Gakinotanbo Peatland spread to the outside and influences of mudflows decreased except marginal places. Beginning of this stage roughly corresponds to onset of peat deposition in peatlands, located on the gentle slope in the alpine zone and on the gentle piedmont slopes in the subalpine zone and montane zone in the the Northern Japanese Apls. Peat layer of this stage contains many wood particles, which suggest rather dry condition and frequent occurrences of heavy rainfall during the snow-free season.(3)3-4000yr. B. P. to presentAt the Gakinotanbo Peatland, influences of mudflows decreased even at the marginal and peat layer has changed to umdercomposited. Those are considered to have been reflected not only the delay of snow melting caused by the little lowering of temperature, also decrease in occurrences of heavy rainfall.At beginning of this stage, the Okameike peatland where winter snowfall mainly brought by the low pressures along the Pacific coast has changed from the pond to the peatland synchronously.

本文讨论了三个泥炭地的沉积特征。一个位于日本北方多雪的阿尔卑斯山地区（Gakinotanbo），另一个位于冬季少雪的纪伊山脉地区（Okamekie泥炭地和Oodai-ga-hara）。B。P = 8000 B。P.泥炭开始在Gakinotanbo泥炭地存款。在此期间，泥炭地外部经常发生严重的泥流，这表明北方日本阿尔卑斯山的斜坡条件不稳定。（2）8000年。B。P.至3- 4000年。B。P.Gakinotanbo泥炭地向外扩展，除边缘地区外，泥石流的影响减少。这一阶段的开始大致对应于泥炭地泥炭沉积的开始，位于高山带的缓坡上和北方日本阿尔卑斯山的亚高山带和山地带的皮埃蒙特缓坡上。此阶段的泥炭层中含有大量的木质颗粒，这表明在无雪季节，泥炭层处于相当干燥的状态，并且经常发生暴雨。（3）3- 4000年。B。在Gakinotanbo泥炭地，即使在边缘，泥流的影响也减少了，泥炭层已经变成了地下复合层。这不仅反映了气温的小幅下降导致的融雪延迟，而且还反映了强降水的减少。在这一阶段开始时，冬季降雪主要由太平洋沿岸沿着的低气压带来的冈美池泥炭地同步地从池塘转变为泥炭地。