Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/33538
標題: 農業小集水區開發治理後土壤流失量與逕流量推估之探討
A Study on Estimating Soil Loss and Runoff in a Small Agricultural Watershed after Developing and managing
作者: 陳勝全
Chen, Sheng-Chyuan
關鍵字: Agricultural Watershed
農業集水區
Soil Loss
Runoff
Agricultural Non-Point-Source Pollution Model
Sediment Delivery Ratio
土壤流失量
逕流量
農業非點源污染模式
泥砂遞移率
出版社: 水土保持學類
摘要: The main purpose of slopeland development has changed from simple production to multiple conserving utilization in order to develop a sustainable-slopeland agriculture. The objective of this study is to monitor the soil erosion, runoff and sediment yield after the development of an agricultural watershed in Tainan county. The measured soil erosion, 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.
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 台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 。經由實測的土壤沖蝕量、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),由1995年 4月 1日起 C為 1.0,一年後降至0.04。 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。
URI: http://hdl.handle.net/11455/33538
Appears in Collections:水土保持學系

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