2026-03-07T12:36:04Z https://kitami-it.repo.nii.ac.jp/oai

oai:kitami-it.repo.nii.ac.jp:00007747 2026-02-17T00:50:35Z 1:86

網走川における透過性構造物の塩水遡上への影響 IMPACT OF A MESH STRUCTURE ON SALINITY INTRUSION IN ABASHIRI RIVER 吉川, 泰弘 安田, 浩保 渡邊, 康玄 Watanabe, Yasuharu mesh structur salinity intrusion hydraluc experiment On the Abashiri River in Eastern Hokkaido, the inflow and accumulation of natural and artificial pollutants has increased the risk of blue tides, which can damage fishery. This study examined the use of a permeable fishing weir, similar to those used for catching salmon, in controlling salinity intrusion. Hydraulic experiments and numerical calculations revealed the following. 1) Conventional one-dimensional two-layer flow models that consider form drag at the boundary between fresh and saline water can reproduce the behavior of the saline wedge. 2) Permeable structures, such as fishing weirs, are effective in controlling salinity intrusion when the tide is changing from neap tide to spring tide, but not when it is changing from spring tide to neap tide. However, numerical calculations suggest that halfway between spring tide and neap tide, the seaward flow of fresh water is reduced by the permeable structure, which allows saline water in the river channel to intrude upstream into the lake. journal article 公益社団法人 土木学会 2007-06 application/pdf 河川技術論文集 13 7 12 https://kitami-it.repo.nii.ac.jp/record/7747/files/2007-06.pdf https://kitami-it.repo.nii.ac.jp/records/7747 jpn c 2007 公益社団法人 土木学会 open access