@article{oai:niigata-u.repo.nii.ac.jp:00028171,
 author = {青木, 滋 and 佐藤, 修 and 霜鳥, 重雄 and 藤田, 至則 and 茅原, 一也 and 早川, 嘉一 and 小林, 裕幸 and 田村, 尚 and 一条, 芳浩 and 石本, 伊佐雄 and 鈴木, 幸治},
 journal = {新潟大学積雪地域災害研究センター研究年報, 新潟大学積雪地域災害研究センター研究年報},
 month = {Jan},
 note = {This is the third of a series of papers on the Ura river basin (AOKI et al 1983) and deals with the results of the research carried out in1982. The results can be summarized as follows. 1. The results of electrical conductivity measurement of bored cores in the area where the landslide occurred in May, 12, 1981, are shown in Table. 1, Figs.1 and 2. The quality of ground water of this area belongs to sulfate-bicarbonate type as shown in Figs. 3 and 4. 2. The ground water collected in the upper stream area are rich in sulfate ions and partly strongly acidic. The wide distribution of iron sulfur oxidizing bacteria and pyrite in the area suggests that sulfate ion are bacterial oxidation products of pyrite. 3. The “terras deposits developing along the right side of the Kanayama and Ura river have been considered as debris flow deposits from Mt. Hieda in 1912 by MACHIDA (1964). Our studies made clear that these deposits are not debris flow deposits but are the lowest part of the Pleistocene andesite group as shown in Figs. 6 and 7. The debris flow deposits from Mt. Hieda cover only in thin layer overlying the andesite group as shown in Fig. 9. 4. During July to October in 1982, we could several times observe debris flows in the Kanayama river by using T.Ⅴ. cameras (Table. 2 and Fig. 10). The observation data are shown in Tables 3 to 6 and Fig. 11. Fig. 12 shows the interrelation between the features of rain fall and occurrence of debris flows. 5. Change of electrical conductivity of river water was continuously observed every day and on flowing down of debris flows at Kanaya bridge by electric conductivity recorder (Fig. 14). 6. Variation of electrical conductivity of the Kanayama river water was mainly explained by precipitation. The relative composition of ions in the water collected on rainy time was rich in calcium hydrogene carbonate ions (Fig. 15). The turbid water caused by small slope failure showed low pH but other ion composition and concentration was very similar to the water sampled before the failure except the disappearance of small amount of hydrogene-carbonate ions (b).},
 pages = {1--38},
 title = {姫川水系浦川流域における斜面崩壊と土石流について : その3},
 volume = {6},
 year = {1985}
}