EVALUATION OF A DIVERSION FACILITY DURING DOWNSTREAM MIGRATION OF MASU SALMON SMOLT AT THE PIRIKA DAM, HOKKAIDO, JAPAN
サクラマススモルトの降下時における美利河ダム分水施設の評価

Kazufumi HAYASHIDA, Hisaya NII, Kazuyoshi WATANABE, Toshiyuki MIYAZAKI, Hiroshi UEDA
2015 Journal of Japan Society of Civil Engineers Ser B1 (Hydraulic Engineering)  
1 正会員 博士(環境科学)寒地土木研究所水環境保全チーム(〒062-8602 札幌市豊平区平岸1-3-1-34) 2 博士(水産科学)北海道栽培漁業振興公社(〒003-0874 札幌市白石区米里4-1-3-3) 3 正会員 寒地土木研究所水環境保全チーム(〒062-8602 札幌市豊平区平岸1-3-1-34) 4 北海道開発局美利河ダム管理支所(〒049-4151 北海道瀬棚郡今金町字美利河) 5 医博, 水産博 北海道大学北方生物圏フィールド科学センター(〒060-0809 札幌市北区北9条西9丁目) A diversion facility installed at reaches upstream of Pirika Dam to generate downstream flow into the fish passage, and allow the fish to migrate to the sea. However, when the flow rate of the diversion facility exceeds 7.00m 3 /s, there are
more » ... m 3 /s, there are concerns that masu salmon smolt have trouble reaching the dam reservoir, because the smolt in the dam reservoir cannot migrate to the sea through the diversion facility. A PIT tag system and radio transmitters for biotelemetry was used to evaluate the diversion facility. It was found that 88.2 % of the smolt were able to enter the diversion facility, and 80.4 % of all smolt were able to access the fish passage. It was also clarified that smolt downstream migration had two peaks per day. During the study period, although the flow rate was in the range between 2.21m 3 /s and 30.4m 3 /s, the diversion facility was revealed to have satisfactory functionality for the downstream migration of smolt.
doi:10.2208/jscejhe.71.i_943 fatcat:ryoli3qke5gqhkiamrop7a3hse