<論文>HS-ブロック

概要

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In 1988,the Haboro Development System Center in Hokkaido designed a wooden artificial reef, an HS-block. The HS-block is made of concrete base, steel rods, branches salvaged from the thinning of fir and larch trees, and minerals. A standard HS-block is about 2m X 2m X 2m and weighs about 11 tons. Two hundred thirty HS-blocks were placed in Haboro Prefecture and twenty in Okinawa Prefecture. Since 1989,we have conducted a multidisciplinary research on the effects or contributions of these HS-blocks to the environment of coastal waters. Our field observations over the past ten years show that wood stock, which was one of the main structural design components, has proven to be quite vulnerable to shipworms. Therefore we designed a new HS-block in 1992. We tested this new HS-block as an artificial algae reef on the beaches at Haboro from 1992 to 1997. Why did a great deal of algae, especially Laminaria sp., grow on the HS-blocks at depths of 3-5 m in the coastal water? One reason was the presence of small worms which live in the wood of HS-blocks. However, we are not aware of other possible reasons. In this paper, we will discribe our research in regards to HS-blocks and the newly designed ones, which were placed on the beaches at Haboro.
北海道東海大学の論文
1998-03-25