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題名 | 彰化地區淺層地表土壤入滲行為之研究=Water Infiltration in Shallow Soils in Janghauh Area |
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作者 | 李振誥; 余進利; 陳志忠; 陳榮華; | 書刊名 | 臺灣水利 |
卷期 | 46:2=182 1998.06[民87.06] |
頁次 | 頁12-22 |
分類號 | 434.222 |
關鍵詞 | 入滲; 入滲評估理論; 補注率; 雙環試驗; Infiltration; Infiltration evaluation methodology; Recharge rate; Double ring infiltrometer test; |
語文 | 中文(Chinese) |
中文摘要 | 本研究主要內容在於以入滲評估方法論來探討並分析彰化地區淺層土壤之入滲行 為。在入滲評估方法論中分別考慮了各項影響入滲的因素,包括降雨、蒸發、蒸散、土壤表 面的入滲、水份在地下的空間分佈,以及排水等。此外,分析時亦考慮不確定性的因素,並 將其對分析時之影響予以量化。 對於彰化地區地下水補注與入滲過程分析,首先以現地試驗及實驗室試驗分別來進行土壤特 性試驗分析(如現地雙環試驗、離心機試驗), 以獲得入滲評估方法( IEM )所需之各項 參數,並以序率模式及定率模式來分析,而分析結果所得之資料則可用以預測在不同條件下 補注率及土壤特性參數之關係,以及彰化地區淺層土壤入滲行為之特性。 應用土壤入滲評估方法論於彰化地區, 以平均補注率 R=0.058 cm/hr 及平均土壤特性參數 β =0.17 分析該區淺層土壤,得到該區土壤之相對含水率期望值為 0.69,發生積水的機率 為 7.77%,入滲流速期望值為 0.13 cm/hr,以及入滲比流量為 0.057 cm/hr。 分析結果發 現,補注率愈小,土壤特性參數對相對含水率、入滲流速、入滲時間及入滲比流量影響愈大 ,但對於發生積水的機率則無影響。此外根據入滲比流量,估算出彰化地區 1983 年經由地 表淺層補注而入滲至土壤中之水量約為 4.02 × 10 �� m �� /year。 |
英文摘要 | In this study, the infiltration evaluation methodology (IEM) provides a consistent and well-formulated approach for evaluating field-scale infiltration and drainage in shallow soils in Janghauh area, Taiwan. The IEM considers the effects of climate and precipitation events, soil surface infiltration, the redistribution of moisture in the subsurface, and the drainage into the unsaturated soil unit through the surface. The IEM also considers the uncertainty in estimating moisture movement through subsurface soils and quantifies the influences on infiltration and drainage estimates. In the IEM analyses, the hydraulic parameters of the soil were first obtained from field and laboratory experiments. The analysis of infiltration is performed using the analytical closed-forms of stochastic and determinstic models, so that the infiltration behaviors can be evaluated in shallow soil in Janghauh area under different conditions, such as recharge and soil characteristic parameter. As giving the recharge rate 0.058 cm/hr and the soil characteristic parameter 0.17, the analysis result shows that the relative saturation, probability of ponding, the expected values of infiltrated velocity and specific flux are 0.69, 7.77%, 0.13 cm/hr and 0.057 cm/hr, respectively. In smaller recharge rate, the soil characteristic parameter will be more significant for the properties of relative saturation, infiltrated velocity, infiltrated time and specific flux. In 1983, the capacity of infiltrated water from the surface was predicted as the value of 4.02 × 10�曠�瀾n Janghauh area. |
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