[H-DS10] 湿潤変動帯の地質災害とその前兆

[HDS10-08] 京都市東山地域における斜面の地表面変位量と崩壊発生の潜在的危険度評価

*藤本 将光¹、檀上 徹²、戸田 堅一朗³、宇次原 雅之⁴、里深 好文¹、深川 良一¹ (1.立命館大学、2.国立研究開発法人防砂科学技術研究所、3.株式会社ジオ・フォレスト、4.日特建設株式会社)

To evaluate the potential risk of sediment disasters at Kiyomizu-dera Temple, we investigated the spatial distribution of springs based on a topographical analysis using a Curvature and Slope (CS) topographical map. The study area was divided into two areas, erosion and non-erosion, divided by a fault line. We observed springs with small slope collapse at numerous points in the erosion area. Our results suggest deep infiltration of groundwater in the non-erosion area, and exfiltration of groundwater in the erosion area, leading to the occurrence of slope collapse. In addition, we installed a field monitoring system on a slope behind a culturally important building to measure surface displacement to 1.0 m depth using inclinometer sensors. Our results suggest that a slip surface formed at GL-0.6 to -1.0 m. The relationship between rainfall and maximum displacement indicated the coefficient of determination with the highest relationship between hourly rainfall and maximum displacement.