2024-03-29T06:48:49Z
https://niigata-u.repo.nii.ac.jp/oai
oai:niigata-u.repo.nii.ac.jp:00028030
2022-12-15T03:57:55Z
453:456
503:836:1555:1563
沖見地すべり流域における地下水流出特性の解析
沖見地すべり流域における地下水流出特性の解析
Analysis of Spatial Characteristics for Groundwater Flow in Okimi Landslide Area
羅, 暁林
丸井, 英明
佐藤, 修
渡部, 直喜
landslide
analysis of principal component
groundwater flow
地すべり
主成分分析
地下水流出
This paper deals with the study on hydrological origins of groundwater runoff that were measured at two small basins in Okimi landslide in Southern Niigata Prefecture, Japan. The study shows the appreciable contribution of high groundwater runoff to the landslide movement that has been depicted by the runoff observation at the two small basins A and B. The observation of groundwater runoff was carried out for over one year. The following results were obtained from the study: 1) Chemical analysis on components of groundwater shows significant difference of chemical composition of groundwater between the two small basins A and B. Further, there are a wide variety of chemical compositions among waters from the drainage well, drainage bore holes and small torrents. 2) Origins of groundwater in Okimi landslide area were estimated by using “principal component method”. Results of the analysis shows that there are two types of water from different origins. One is originated from surface water which has low ion density. And the other is originated from groundwater which has high ion density. As a result of separation of hydrograph components, in A basin 69% of the total groundwater runoff consists of groundwater and in B basin 64% of the total groundwater runoff consists of groundwater. 3) As a result of separation of hydrograph components by using ∂^<18>O method, it was estimated that in A basin 62% of the total runoff consists of groundwater and in B basin 54% of the total runoff consists of groundwater. 4) As a result of separation of hydrograph components by using electric conductivity method, it was estimated that in A basin 74% of the total runoff consists of groundwater and in B basin 64% of the total runoff consists of groundwater during snow melt season. Electric conductivity method is a simple and useful method to separate the hydrograph components of groundwater runoff. 5) As a result of separation of hydrograph components by using electric conductivity method, it was estimated that in both A and B basins contribution of runoff to groundwater during summer rainy season is higher than that during snow melt season. In summer rainy season 95-96% of the runoff consists of groundwater. During snow melt season almost constant amount of groundwater runoff was observed continuously. On the other hand, during summer rainy season significantly high amount of runoff was observed. The different characteristics of landslide movement between snow melt season and summer rainy season might be due to the different behaviour of deep groundwater between the two seasons.
新潟大学積雪地域災害研究センター
1999-03
jpn
departmental bulletin paper
http://hdl.handle.net/10191/39200
https://niigata-u.repo.nii.ac.jp/records/28030
AN00183327
03877892
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
20
62
80
https://niigata-u.repo.nii.ac.jp/record/28030/files/20_62-80.pdf
application/pdf
1.2 MB
2019-08-20