頁籤選單縮合
題 名 | Sensitivity Analysis of Embryo Survival Model for Salmonid Spawning Gravels=礫石河床鮭魚存活率模式之敏感度分析 |
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作 者 | 吳富春; 馬昱; 曾尹玢; | 書刊名 | 農業工程學報 |
卷 期 | 47:4 2001.12[民90.12] |
頁 次 | 頁39-47 |
分類號 | 388.5 |
關鍵詞 | 產卵礫石河床; 鮭魚存活率; 敏感度分析; 沖淤水流; 棲地改善; Spawning gravels; Salmonid embryo survival; Sensitivity analysis; Flushing flow; Habitat enhancement; |
語 文 | 英文(English) |
中文摘要 | 本文主要針對礫石河床之鮭魚存活率進行敏感度分析。本研究針對礫石河床鮭魚存活率預測模式進行個別參數敏感度分析及組合參數敏感度分析,所探討之三項參數包括:泥砂礫石粒徑比、無因次水頭差及礫石孔隙水流路徑比。個別參數敏感度分析結果顯示泥砂礫石粒徑比為最敏感參數,且其值之減小對存活率降低之影響甚大,無因次水頭差之影響次之,礫石孔隙水流路徑比之影響甚微。組合參數敏感度分析結果顯示泥砂礫石粒徑比在搭配無因次水頭差上限值與礫石孔隙流路徑比下限值時具有最大敏感度,對鮭魚存活率影響最大。此外,本研究亦利用鮭魚存活率預測模式及沖淤水流模式探討沖淤水流時距之敏感度,針對礫石特性粒徑比、無因次水頭差及礫石孔隙水流路徑比進行個別及組合參數敏感度分析。研究結果顯示礫石特性粒徑比對沖淤水流時距之縮短影響甚鉅,且其在搭配無因次水頭差與礫石孔隙水流路徑比之上限值時有最大敏感度。本敏感度分析之結果不僅可做為棲地改善與沖淤水流規劃之依據,更可供後續不確定性分析之參考。 |
英文摘要 | This paper addresses the sensitivity of embryo survival in salmonid spawning gravels. Individual and combined sensitivity analyses are conducted on three parameters of the predictive model for embryo survival, namely, sediment-gravel size ratio d₃/D₈, dimensionless pressure head h/L₁, and ratio of intragravel flow paths L₂/L₁. Individual analysis indicates that reduction of embryo survival rate is most sensitive to d₃/D₈. The results are more sensitive to the decreases in d₃/D₈ and h/L₁ than to the increases in the two parameters. The model is least sensitive to L₂/L₁. The results of combined analysis reveal that d₃/D₈ has significant effects on embryo survival, the effects are even greater when h/L₁ is at is upper bound value and L₂/L₁ is at its lower bound value. In addition, the embryo survival model is incorporated into the flushing flow model to investigate the sensitivity of the interval between flushing flows. It is shown that the characteristic gravel size ratio has significant effects on flushing interval, especially when d[fede]/d[fef5], h/L₁, and L₂/L₁ are all at their upper bound values. The results of sensitivity analysis can be used as guidelines for planning of habitat enhancement and flushing flow strategy. The results also provide useful information for further uncertainty analysis. |
本系統中英文摘要資訊取自各篇刊載內容。