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來源資料
頁籤選單縮合
題 名 | 農業小集水區開發整治後土壤流失量與逕流量之評估=The Evaluation of Soil Loss and Runoff of an Agricultural Watershed after Development and Management |
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作 者 | 林俐玲; 陳勝全; | 書刊名 | 水土保持學報 |
卷 期 | 30:2 1998.06[民87.06] |
頁 次 | 頁143-175 |
分類號 | 436.124 |
關鍵詞 | 農業集水區; 土壤流失量; 逕流量; 農業非點源污染模式; Agricultural watershed; Soil loss; Runoff; AGNPS; |
語 文 | 中文(Chinese) |
中文摘要 | 山坡地開發已由以往單純的農牧生產利用推展至多元化經營的保育利用為主,期 能使山坡地變為一永續生產的農場。因此,本研究之目的,乃針對臺南縣左鎮鄉菜寮地區一 經大規模開發治理的小農業集水區進行現場試驗。經由實測的土壤流失量、逕流量及泥砂生 產量來說明整治後之成效。 並輔以 AGNPS 模式,配合當地地文條件,予以適當選用模式參 數,進而和現場實測資料比較,期能驗証模式之適用性,以為日後中小集水區整治規劃之參 考,其結果如下: 1. 試區土壤可蝕性因子( K )經由實測結果為 0.09。 2. 試區自 1995 年 4 月至 1996 年 3 月之實測土壤沖蝕量為 544.5 公噸╱公頃,農塘泥 砂淤積量為 188.8 公噸╱公頃,屬於高土壤沖蝕區。 3. 試區植生覆蓋與管理因子( C )採動態因子,經推求係為一指數遞減的連續函數,關係 式為 Y=0.9685*EXP(-0.009152*X) 式中 Y:C 因子 X:時間(天) 4. 一次暴雨總逕流係數 Cr 值為 0.40 ∼ 0.45、泥砂遞移率( sediment delivery ratio )為 34.7%,說明了集水區有不錯的水源涵養能力及治理成效之評估指標。 5.AGNPS 模式模擬結果,土壤沖蝕量為 449.7 公噸╱公頃、泥砂生產量為 155.7 公噸╱公 頃、泥砂遞移率( sediment delivery ratio )為 34%、逕流係數為 0.28,與實測值之比 值則分別為 82.6%、82.5%、97.1% 及 70.0%,兩者估計值相當符合,呈高度相關性, 可知 AGNPS 模式確有其適用性。 |
英文摘要 | The main purpose of recent slopeland development has changed from simple production to multiple conservation utilization for sustainable slopeland agriculture development. The objective of this study is to monitor the soil loss, runoff and sediment yield after the development of an agricultural watershed in Tainan county. Measured soil loss. runoff and sediment yield were also compared with output from the AGNPS model. The results are summarized as follows: 1. The measured soil erodibility factor (K) in the experimental area is 0.09. 2. From April, 1995 to March, 1996, the soil erosion and sediment yield measured at the experimental site are 544.5 t/ha and 188.8 t/ha, respectively. 3. The cover and management factor (C) is dynamic and time dependent. The function of C factor is: Y=0.9685*EXP(-0.009152*X) where Y:C factor X:time(day) 4. The measured runoff coefficients (Cr) are between 0.40 and 0.45. The sediment delivery ratio is about 34.7%. 5. The values of soil erosion, sediment yield, sediment delivery ratio and runoff coefficient simulated by AGNPS are 449.7 t/ha, 155.7 t/ha, 34% and 0.28, respectively, Comparison of measured and simulated results indicated that AGNPS is suitable for estimating soil erosion and sediment yield in agricultural watershed and also as a tool for making the necessary management decisions. |
本系統中英文摘要資訊取自各篇刊載內容。