劉振宇2006-07-252018-06-292006-07-252018-06-292000http://ntur.lib.ntu.edu.tw//handle/246246/10707本計畫目的在於推求出台西至麥寮地區之天然補注量，並明瞭不同土地利用型態之入滲特性，以提供地下水資源規劃決策及評估所需之依據。本計畫藉由彰化田中試驗田區之土壤物理特性及水力傳導係數之量測數據，作為一維SAWAH 及三維地下水數值模式FEMWATER 模擬試驗田區之地下水入滲，側流及推估地下水有效補注量之依據， 模式雄估年水田平均入滲量分別為台西鄉155 萬8 千立方公尺，麥寮鄉454 萬9 千立方公尺，合計兩鄉在每年第一期作（春作）時期，即3 ? 5 月期間約有61 ○ 萬8 千立方公尺之入滲量。由於水田在此區各種農／漁土地利用型態中具有最高之入滲率。模式模擬結果亦顯示區域性水田入滲以垂向運動為主，側滲則明顯發生於乾濕邊界區，側滲比例隨著乾濕邊界長度、水田湛水面積及初始土瓖水分含量不同而改變。模擬結果亦顯示乾田時期之水田因田面乾裂，致牛踏層遭受破壞，且入滲壓力水頭增加，造成入滲率之大幅提昇。研究成果有助於瞭解水田入滲至地下水之移動機制，垂直流與水平側向流動過程。由於台西麥寮地區之水田具有完整之引水渠道，未來若能配合水利單位近年來研擬之夏季水田蓄洪及補注地下水措施，將是大幅增加本區地下水補注量之可行方式。The purpose of the study is to quantity the amount of annual recharge in the area from Tai-shi to Mai-lau. The result will be useflul to the government for planning and management of groundwater resources. The study has established the relationship between the lateral and vertical percolation in paddy field, assessed the potential methods of increasing the ground water recharge from the paddy field. The data of soil characteristics and hydraulic parameters obtained from Ten-Chung flooded paddy field are used for the simulation model. The l-D SAWAH and 3-D model FEMWATER are adopted to simulate infiltration and groundwater recharge in paddy field. According to the simulation results, the paddy field remains the higrest infiltration rate than the other landuse patterns, its infiltration capacity is restricted by the hardpan. Though the irrigationlinfiltration is just taken place from March to May in a year , the annual amount of irrigation water infiltrating through hardpan is 1,558,000 cubic meters in Tai-Shi and 4,549,000 cubic meters in Mai-Lau. Simulation results also show that the movement of infiltration water is mainly vertically downward in most area for regional flooded paddy field, the lateral movement is obviously occur on the wet to dry boundary. The ratio of lateral seepage depend on the length of wet to dry boundary, the area of flooded paddy field, and the different initial water content in floodedldry farm soils. The cracks developed when paddy field in drainage condition will obviously increase the infiltration rate because of the breakage of hard pan. It suggests that the usage of these paddy field farms and its irrigationlconduit system is a feasible way in increasing the amount of recharge and flood control on summer times.application/pdf3076188 bytesapplication/pdfzh-TW國立臺灣大學生物環境系統工程學系暨研究所reporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/10707/1/892625Z002016.pdf