On the Investigation of Ground-water Veins in the Minazuki Landslid by Underground Temperatur Survey at One Meter Depth
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概要
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Underground temperature survey at one meter depth was conducted at the Minazuki landslide in Ishikawa Prefecture with the purpose of investigating the flowing channels of the water infiltrated from a spring and a pond which exist in the upper part of the landslide area. Parts of low temperature proLably caused by the flow of ground water were determined after the effect of various factors have been taken off from the obtained data. As a result of the investigation, it was found that the parts, which originate from the spring and/or pond, join together at the flat land of the upper part of the area and part into three zones; near the northern boundary of the area and the central part as well as near the southern boundary of the area; those three zones extend separatedly toward the toe of the slope.<BR>If each low temperature zone assumed to be caused by the flow of ground water with a large filtaration velocity (about 2.1× 10<SUP>-1</SUP>cm/sec) and a lower temperature (12.20° C) as compared with those in the usual ground at one meter depth(22.12° C), it is probable that a vein of ground water exists under each zone. Among three veins, three veins of the northern side and the central part were convinicingly evidenced by tracer method for ground water. And the existence of the vein of the southern side is highly probable, as there are a small landslide and springs at an extension of the zone.<BR>The scale of those veins were calculated with the aid of θ <SUB>z=1</SUB>y diagrams. As a result of those calculations, it war shown that each vein had their top between six and seven metrs depth and that the sizes of them were increasingly greater toward the north.
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