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Quantitative progress in the evaluation of the wear of wooden check dam elements: case study of Aomori cypress wood 64 years after construction
European Journal of Wood and Wood Products ( IF 2.6 ) Pub Date : 2020-11-18 , DOI: 10.1007/s00107-020-01627-5
Hiromi Akita

There are only few cases where the wear of elements of wooden check dams installed in a mountain stream has been investigated, and the actual state of the progress of wear has not been clarified. The purpose of this study was to clarify the progress of wear on the elements of the wooden check dam in flowing water. A wear survey was carried out on the elements of the wooden check dam in the Tsubokesawa basin, Aomori Prefecture, 64 years after construction, and compared with the wear progress after 51 years from the authors' survey in 2005. As a result, the influence of wear on the side surface of the elements appears remarkable and considering the change in flow rate from normal times to the time of water discharge, the elements were worn in three dimensions including the tip. When the residual ratio of the cross-sectional area was calculated, it was about 40% at the end of 51 years, but it became clear that wear progressed to about 30% after the end of 64 years. Even though only the heartwood of Aomori cypress wood remains, in 13 years, 9–15% of the cross-sectional area is still wear by the flow of water containing sediment sand, and it was considered that the wear was in progress.



中文翻译:

木制检查坝构件磨损评估的定量进展:青森柏木建成后64年的案例研究

仅在少数情况下调查了安装在山a中的木制防洪堤的构件的磨损,并且尚未弄清磨损进展的实际状态。这项研究的目的是弄清木制止水坝在流动水中的磨损情况。对青森县Tsubokesawa盆地的木制防洪坝的构件进行了磨损调查,施工期为64年,并与2005年作者调查后51年的磨损进度进行了比较。结果,影响元件侧面的磨损非常明显,考虑到正常时间到排水时间的流量变化,元件在包括尖端在内的三个维度上磨损。计算出截面积的残存率时,在51年末时约为40%,但很明显,在64年后磨损增长至约30%。即使仅保留青森柏木的心材,在13年中,由于含沙沉积物的流动,仍有9-15%的横截面面积磨损,并且认为磨损正在进行中。

更新日期:2020-11-18
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