Effects of Soil Freezing on the Stability of Slopes

野外观测是在1995年兵库县南部地震后变成光秃秃的六野山山坡上进行的。1997年，在规划野外观测和开展六高山初步调查、准备仪器的同时，在已有资料的基础上，分析了土壤冻结对田中山和平山边坡的影响。1998年和1999年获得了系统的野外资料。由于试验坡度是在1999年春季改变的，土壤冻结的数据只有在冬季中期才能获得，因此对六甲山边坡的野外数据分析还没有完成，无法编写成学术文章。因此，本研究报告涉及了在田中山、平拉山和六光山的研究结果。该项目的主要研究活动总结如下：1997年进行了实地观测的准备和仪器，以及对现有数据的分析。1998年，在田中山和平山的斜坡上增加了土壤冻结和解冻对水文地貌过程的影响的重新检查，结果反映在1998年6月举行的日本物理水文学研究小组全体会议的实地考察指南中。1999年，在日本地貌学联合会学报上发表了一篇学术论文，分析了南兵库县地震时土壤冻结和植被条件对边坡破坏的影响。

The field observation was carried out on the slopes of the Rokko Mountain, which had become bare due to the Southern Hyogo Prefecture Earthquake in 1995. In 1997, the effects of soil freezing on the slopes of the Tanakami mountains and the Hira mountains were analyzed on the basis of the existing data, while planning the field observation and executing the preliminary investigation in the Rokko Mountains, and preparing the instrumentation. Systematic field data were obtained in 1998 and 1999. The analyses of the field data on the slopes of the Rokko Mountains have not been finished so as to be compiled in an academic article, since the experimental slope was changed in the spring of 1999and the data of soil freezing are available only in the mid -winter season. Thus, the research report involves the results of the studies in the Tanakami Mountains, the Hira Mountains and the Rokko Mountains. The major research activities of this project are summarized as follows:The preparation and instrumentation of the field observation, and the analyses of the existing data were carried out in 1997. In 1998, re-examination of the effects of freezing and thaw of soil on the hydrogeomorphic processes on the slopes in the Tanakami Mountains and Hira Mountains was added and the result was reflected by the field guidebook for the excursion of the general meeting of the Japanese Research Group of physical Hydrology held in June 1998. In 1999, an academic article was published in Transactions of Japanese Geomorphological Union, based on the analysis of the effects of soil freezing and vegetative conditions on the slope failure at the time of the Southern Hyogo Prefecture Earthquake.