Relation between wooden bridge length across ohi river and the deforestation in the Edo Era

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Abstract

According to the old documents, there was awooden bridge called as Hanehashi', that was a rare type of cantilever, at the upper reach of Ohi River, Japan, in the Edo Era. The span of this bridge was kept as 72.8 m long from 1607 to 1692. But after deforestation works of forest 3,600 ha in the upper watershed, the span was extended stepwisely longer as 85.5 m in 1702 to 100.1 m in 1815. Because of the geographic conditions for the suitable base of bridge, the Hanehashi was rebuilt at almost the same place from the initial construction to the last. The authors think, deforestation works led to flood often, eroded the bank, and damaged the Hanehashi, so the span had to be extended to longer and adjusted to the width of river.

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Takao, K., & Omura, H. (2008). Relation between wooden bridge length across ohi river and the deforestation in the Edo Era. Nihon Ringakkai Shi/Journal of the Japanese Forestry Society, 90(3), 190–193. https://doi.org/10.4005/jjfs.90.190

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