台灣地下水學界及工程界均認爲,幾十年來之年平均補注量爲40億噸,然地下水補注在時空分佈不一,其補注量之多寡必須要經長期間之地下水經營管理才能正確推算;又地下水補注在時空分佈不一,補注量之計算亦以每一降雨事件及地區之水文,水文地質等特性來推估,而整個地下水資源的管理,在於使用地下水量與補注地下水量,在時空中達一平衡,所以需瞭解地下水補注之行爲。因此本研究之目的即在瞭解坡地竹林集水區的降雨入滲補注行爲,並探討坡地集水區土壤水分移動之特性,採用國立屏東科技大學陡坡地水土保持示範區之竹林集水區爲試驗地,在不同覆蓋狀況之地表下不同深度(20、40、60、80、100 cm)處,量測未飽和層之土壤水分移動,瞭解竹林集水區內,土壤水分在時間及空間上移動之特性,並由離子平衡法計算地下水補注量,提供集水區水文收支基本資料之參考依據。
This research was conducted in the bamboo watershed on the steep slopeland at National Pingtung University of Science and Technology. Soil moisture variation in unsaturated zone were measured by soil moisture cells, and the characteristics of groundwater recharge was calculated by chloride balance methods. The results may promote the research techniques of soil moisture in Taiwan, and offer a further reference to both slopeland disastrous research and construction design.