作業者への負荷量からみた実施条件:サクラマス産卵環境の持続的な創出にむけて  [in Japanese] Implementation conditions in terms of the amount of load on the operator:sustainable creation of a spawning environment for masu salmon  [in Japanese]

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<p><tt>渓流域でのサクラマスへ産卵環境の提供を事例として、作業者の身体負荷量を考慮し検討した結果、次の知見が得られた。1)1 日の活動時間は6 時間以内とし、そのうち造成作業は3 時間以内で完了する。2)造成面積は約2m</tt><tt><sup>2</sup></tt><tt>、適材の適量は約330kg。3) 造成数は4 か所を基準とする。4)造成環境の条件は次のように整理された。①「採集」は、河道に近接する陸域にて適材が約330kg 以上密に堆積する場所で実施する。②「整地」は、河床の掘り起こし作業が少なく、かつ、適材投入後の水深が30 ㎝程度となる場所で実施する。③「運搬」は、採集地から造成地までの経路ができるだけ陸域となる場所を選定する。 以上の条件は、渓流域における持続的な環境修復活動への重要な知見となる。</tt></p>

<p>We examined the conditions for providing spawning habitat for masu salmon in the stream area, taking into account the physical load of the workers, and found the following. 1) the daily activity time is 6 hours, of which 3 hours are needed for development; 2) the required amount of suitable material is about 330 kg, assuming the size of the spawning ground is 2m<sup>2</sup>; 3) the number of creating the spawning ground per day is 4 sites per river, based on the past results of the use of masu salmon; 4) The following three environmental conditions are important for artificial creation. <tt>①</tt>"Collection" is carried out in the land area adjacent to the river channel, where the suitable materials are densely deposited at least 330kg.<tt>②</tt>"Leveling" is carried out at a location where there is little digging work on the riverbed and the water depth is about 30 cm after the appropriate materials are fed into the river.<tt>③</tt>"Transport" should be carried out in a location where the route from the collection site to the development site is as landward as possible. The above conditions are important for sustainable environmental rehabilitation activities in the stream area.</p>

Journal

  • Papers on Environmental Information Science

    Papers on Environmental Information Science ceis34(0), 139-144, 2020

    Center for Environmental Information Science

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