身近な酸性雨被害?三重大学構内におけるコンクリートつららについて(短報)
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概要
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The author examined icicle-like material hanging from the eave and downside of roof of a concrete college building at Mie University, and the findings are reported here: 1. From a geomorphologic viewpoint, the micro-topography of the icicle-like material resembled that of an embryonic stalactite in a limestone cavern. 2. The icicle-like material was classified into eight types: (1) lucent tubular, (2) field horsetail-like lucent tubular, (3) field horsetail-like white and hard tubular, (4) hard tubular with a lucent part in the downward-pointing tail, (5) long tubular, (6) funnel-shaped tubular, (7) row type, and (8) merged type. The material develops from lucent tubular to hard and white tubular, and later merges with other adjacent icicle-like materials. 3. The annual rate of growth of the longest icicle-like material was calculated to be 1.25 cm/year within the last 36 years. 4. A converging lens-like deposit ("stalagmite") was observed on a stool of the building; therefore, the same kind of material might have formed on the ceiling that was removed by the construction. 5. A cuspate horn was observed on the tubular surface of the icicle-like material, forming a right angle with it, and apparently uninfluenced by gravity. 6. These icicle-like materials are well developed underneath the eaves of rooms on the top floor. Their development may depend on the moderate volume of water supplied from the roof and cracks produced by relatively severe exposure to the sun and rain.論説 / Article
- 三重大学の論文
- 2003-03-25