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| | Abstract | | A small-scale resistivity surveying was conducted on a river floor at the middle reaches of Kinu River, flowing in Moka City, Tochigi Prefecture. The purpose of the survey was to clarify the fluvial processes in developing small-scale landforms along river beds. Four short survey lines were set on the river floor, covered with sand and gravel, about 400 m wide and 1 km long, divided into upper, middle and the lower floodplain. Resistivity profiles clearly delineated surficial high resistivity layer up to 3 m in thickness. The resistivities of the surficial layer at the middle floodplain, surface of which was covered with grass plants, was greater than those of the lower surface, which was bare and mainly composed of coarse sands. Whereas the water table was estimated about 1 to 4 m below the surveyed surface, resistivity of the lower part showed from 100 to 600 Ohm-m in all profiles. The survey result indicates the river floor consists of thick coarse-grained fluvial sediments and or conductivity of pore water is relatively low due to the infiltration of fresh water. |
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