Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/34089
標題: 大埔水庫集水區濱水區植生緩衝帶配置效益之研究
Placement Efficiency of Vegetated Riparian Buffer Stripsat DA-PU Reservoir Watershed
作者: 陳光政
關鍵字: 土壤流失公式
Universal Soil Loss Equation
泥砂遞移率
地理資訊系統
全球衛星定位系統
Sediment Delivery Ratio
Geographic Information System
Global Positioning System
出版社: 水土保持學系
摘要: 中文摘要 大埔水庫供應竹苗地區灌溉及工業用水,其集水區之經營管理及保育措施,悠關水庫之使用壽命。本研究以通用土壤流失公式(Universal Soil Loss Equation, USLE)配合泥砂遞移率概念,推估大埔水庫集水區坡面泥砂產量,並模擬配置40m及80m濱水區植生緩衝帶,分別將植生覆蓋因子C值改善至0.1及0.01,以估算其攔砂效益。此外針對沖蝕較嚴重之大坪溪(No.4)及石子溪(No.6)子集水區,應用地理資訊系統配合影像處理技術,分析得出子集水區各項地文及水文特性等參數值,再轉成AGNPS(Agricultural Non-Point-Source Pollution Model) 之資料格式,以單場暴雨為評估基準,推估其不同頻率年之泥砂產量,供溪流整治及水庫經營管理參考。 以USLE分析結果顯示,集水區泥砂產量較大者為大坪溪(No.4)及石子溪(No.6)兩子集水區,其年平均沖蝕深度分別為0.37cm及0.28cm;兩子集水區除坡度較陡峭外,植生覆蓋較差區位亦均位於源頭,與區內旅遊景點之開發區位重疊,為泥砂來源主因之一。若濱水區植生緩衝帶配置區位之C值分別由現況改善至0.1及0.01時,40m寬植生緩衝帶之配置約可減少24.04%及36.83%之泥砂產量,防治效益比為1.93及2.95。80m寬則可減少33.69%及53.00%,防治效益比為1.41及2.23,顯見植生緩衝帶對減少泥砂產量有相當程度效果。 以AGNPS模式分析結果,顯示兩子集水區若配置80m寬植生緩衝帶,當C值為0.1時,大坪溪(No.4)子集水區於2.33年、5年、10年、20年、50年、100年暴雨頻率年之攔砂效益為21.23%~17.61%。C值為0.01時為24.69%~21.28%。石子溪(No.6)子集水區C值為0.1時攔砂效益為30.68%~31.96%、C值為0.01時則為33.01%~34.62%。濱水區植生緩衝帶C值由0.1變至0.01時增加之攔砂效益不大。
Abstract Da-Pu reservoir supplies water for irrigation and/or industry in Hsiung-Chu and Miao-Li areas. The life span of reservoir depends on the efficiency of management and conservation practices in its upstream watershed. This study applied Universal Soil Loss Equation (USLE) incorporated with sediment delivery ratio to assess the efficiency of allocation of Vegetated Buffer Strips (VBS) at the riparian of the studied watershed. Sub-watersheds of Da-Pin and Shi-Zi creek having severe erosion were selected to examine the placement efficiency of VBS by Geographic Information Systems (GIS) integrated with image procession techniques for automatic extracting the input data of AGNPS. The estimated sediment yield derived from AGNPS can be used as the reference of reservoir's management. Due to the steeper slope and the improper land-use for scenic spots development, sediment yields of Da-Ping and Shi-Zi creek sub-watersheds are higher than that of the other sub-watersheds, and the annual erosion depth are 0.37 and 0.28cm respectively. Scenario of cover factor (C) changed to the reduction of sediment yield shows that there is a 24.04% and 36.83% reduction for the 40-m width VBS placement (C=0.1 and 0.01). The 80-m width VBS placement (C=0.1 and 0.01) shows 33.69% and 53.00% reduction calculated from USLE simulation. The placement efficiency of VBS calculated from AGNPS model show that there will be a sediment reduction of 21.83%~17.61 % for C= 0.1, and 24.69%~21.28% for C=0.01 at Da-pin sub-watershed. The ranges of sediment reduction will be 30.68% ~ 31.96% (C=0.1) and 33.01% ~ 34.62% (C=0.01) at Shi-Zi sub-watershed. The scenario of VBS placement and/or different designed storm show little effect on sediment reduction both at the two test sub-watershed with the calculation of C from 0.1 to 0.01.
URI: http://hdl.handle.net/11455/34089
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