Applying stable isotope 18O to the groundwater inverse hydraulic conductivity

• Main Authors: Ying-Chieh Tsai, 蔡英傑
• Other Authors: Kuo-Chin Hsu
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/60778140359278409664

碩士 === 國立成功大學 === 資源工程學系碩博士班 === 94 === The groundwater inverse technique is an important method of site characterization. Because of data deficiency, however, many possible scenarios can be deduced from the same data set. Thus the reduction of parameter’s uncertainty from inverse technique becomes a challenge in groundwater research. Because of the property of mass conservation, stable isotopes are ideal tracers to understand the groundwater movement and to estimate the groundwater recharge. In addition, particle tracking method can be applied to stable isotopes to pursue the flow path. In this study, we use data of groundwater levels and stable oxygen isotope to inverse hydraulic conductivity. The result shows that using stable oxygen isotope and groundwater level in the same time, the uncertainty of numerical models can be effectively reduced. We applied the proposed method to an ASR site in the Pingtung plain. The hydraulic conductivity of sand and gravel were obtained as 0.02772(m/min.) and 0.04835(m/min.), respectively. The stable oxygen isotope is shown to be a useful tool in groundwater inverse problems.