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Affiliation(s)

River Basin Control Bureau Technology Office, Kotanabe 610-0311, Japan

ABSTRACT

Wazuka town in Kyoto prefecture has the largest farmland for Uji green tea on the steep hillsides. In 1953, this area suffered from flood disaster due to the heavy rainfall along with the valley wind. In this area, diluvia, Osaka strata and granite are outcropped along the Wazuka fault, and many old landslides in small scale could be identified. The River Basin Control Bureau has an experimental site locating on Ishidera area in Wazuka, where there was a house that was built about 150 years ago, and the habitants migrated after the 1953 flood. This area was developed for lots and housing during the economic bubble years around 1990, but was abandoned due to the occurrence of a small landslide and the inclination of concrete wall. To understand the distribution of ground water streams, 1 m-depth-ground temperature survey method and sound survey method were used. Using these methods, ground water streams were detected at the Kizu river bank gate site, at salt pan site gate trail, and on Ishidera landslide observatory. Based on the survey results, the construction sites of the wells for the drainage, steel-sheet piles for the river bank and watergate trails for the salt field area were suggested.

KEYWORDS

Ground water streams, 1 m-depth-ground temperature, sound survey, tea farmland, small landslide, salt field, watergate trails.

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