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題名 | 七家灣溪櫻花鉤吻鮭棲地環境之改善分析=Analysis of Habitat Enhancement for Oncorhynchus Masou in Chi-Chia-Wan Creek |
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作者 | 吳富春; 鄭武慎; Wu, Fu-chen; Chen, Wu-shen; |
期刊 | 臺灣水利 |
出版日期 | 19991200 |
卷期 | 47:4=188 1999.12[民88.12] |
頁次 | 頁66-76 |
分類號 | 388.5 |
語文 | chi |
關鍵詞 | 棲地改善; 歧異度; 覆蓋; 櫻花鉤吻鮭; Habitat enhancement; Diversity; Cover; Oncorhynchus masou; |
中文摘要 | 本文針對七家灣溪櫻花鉤吻鮭棲地環境之改善進行探討,文中主要針對水溫及棲 地歧異度兩頸因子之改善方案進行評估。根據數值模擬結果顯示,增加河溪水流速度及覆 蓋度均能達到降低水溫之目的, 當流速增為現況之 2 倍時,研究河段之水溫可降至適合櫻 花鉤吻鮭棲息之溫度 (16 ℃以下 ), 而將研究河段之覆蓋度增加 40%, 水溫亦可降至 16.15 ℃以下。調查資料顯示低矮堰壩、擾流裝置及翼板結構物等人工設施可增加流速及流 向之變異性,進而增加棲地之歧異度。本研究所提出之水溫改善方案中,將研究溪段流速增 為 1.8 位,關鍵溪段 (S3 段 ) 之覆蓋度增加 20% 時,可使研究河段水溫降至 16 ℃以下 ,達到預期之目標。 |
英文摘要 | This paper investigates the enhancement of habitat for Oncorhynchus masou in Chi- Chia-Wan Creek. The alternative plans for improving water temperature and habitat diversity are evaluated. The numerical simulation results indicate that increase of flow velocity or stream cover can lower water temperature. As flow velocity becomes twice of the original magnitude, water temperature of the study reach can become lower than 16 ℃, which is appropriate for Oncorhynchus masou. When the cover of study reach is increased by 40%, water temperature gets below 16.15 ℃. Field data reveal that manmade structures such as low weirs/dams, deflectors, or vanes can increase the variabilities of low velocity and direction, thus increase the habitat diversity. Among the habitat ehnancement plans proposed in this study, the one that increases the flow velocity to 1.8 times the original value and raises the cover of S3 reach by 20% can lower the temperature of the study reach to a point below our goal (16 ℃ ). |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。