- 期刊
流量與水位差對粗首鱲在階段式魚道溯游之影響
Effects of Water Discharge and Head Difference of the Pool and Weir Type Fishway on Passage of Zacco pachycephalus
摘要
要利用位於大甲溪畔八寶圳取水口之木製試驗性質魚道，針對台灣特有魚種粗首鱲進行無潛孔階段式魚道試驗。發現魚類越過隔板頂部時可歸納成4種游泳路徑，主要受流量Q與水位差Δh兩項控制變因之影響。試驗中交叉變化不同的設計條件，包含五組試驗流量（0.02、0.06、0.10、0.14、0.18 cms），五組水位差（12、20、30、40、50 cm），共25組試驗。每次試驗時試驗魚樣本量爲50尾。找出粗首鱲較合適之魚道單位寬度流量條件爲0.06～0.10 cms，粗首鱲在水位差50cm時幾乎無法上溯，在水位差40cm以下時，上溯情形大致良好並不構成障礙。
並列摘要
Pool and weir type fishways established at the shore of the Daika River were used to conduct the upstream migratory experiments of zacco pachycephalus, an endemic species of freshwater fish in Taiwan. The 26 combinations of water discharge (0.02, 0.06, 0.10, 0.14, 18 cms) and head differences (the height of water drop across the baffle) (12, 20, 30, 40, 50 cm) were used to determine the criteria of these two variables for the fishway design. The number of fish used in each experiment was 50. The results suggested that the range suitable for fish of water discharges per unit width (1m) of the fishway was between 0.06 and 0.10 cms, while the suitable head differences were less than 40 cm.