About KOHATA YUKIHIRO
About 室蘭工大 大学院工学研究科
About subsurface exploration
About underground opening
About field study
About Hokkaido
About golf course
About differential settlement
About death accident
About soil test
About waterway
About shallow groundwater
About water channel
About Sightseeing,recreation
About 地盤
About 空洞
About 調査
About 対策
About 北海道
About ゴルフ
About 陥没
About メカニズム