應用氫氧穩定同位素分析地下水補注之研究

A Study on Groundwater Recharge by Hydrogen and Oxygen Stable Isotopes

簡銘成(Min-Chen Chien) ； 杜永昌(Yung-Chang Tu) ； 汪中和(Chung-Ho Wang) ； 丁澈士(Cheh-Shyh Ting)

《農業工程學報》 57卷3期 (2011/09) Pp. 61-74

https://doi.org/10.29974/JTAE.201109.0005

摘要

本研究目的爲應用氫氧穩定同位素分析林邊溪流域之地下水各補注來源比例，並推估2006年林邊溪流域之地下水總補注量。研究結果顯示林邊溪流域2006年之地下水年補注量約爲4.6億立方公尺，年抽水量與流失量總合約爲4.1億立方公尺，除部份沿海地區外，整體來說未超抽。林邊溪流域之地下水補注源經由氫氧同位素質量平衡分析後，發現受降雨直接補注的比例，以含水層F1最高(δ18O=16%、δD=19%)，含水層F3最低(δO18=9%、δD=7%)：受山區側向補注之比例以含水層F3最高(δ18O=91%、δD=93%)，含水層F1最低(δ18O=84%、δD=81%)，顯示林邊溪流域深層含水層之地下水補注受山區河水之補注效應較明顯，而在淺層含水層則是以降雨直接補注較明顯。

關鍵字

林邊溪 ； 地下水補注 ； 地下水流向 ； 氫氧穩定同位素

並列摘要

The purposes of this research are to analyze the correlation of the compositions of hydrogen and oxygen stable isotopes in groundwater recharge sources; and then to estimate the total groundwater recharge amount in Lin Bias River basin as welt as its flow direction for the year 2006. The amount groundwater recharge amount in tin Bias River basin is estimated as about 460 Mm^3 in 2006. The total annual water extraction amount with the water toss is estimated as ea. 410 Mm^3; thus, these two parameters are within the extraction allowance, except for some coastal areas.According to the hydrogen and oxygen isotopic mass balance analyses of the groundwater recharge sources a Lin Bian River basin, the Aquifer F1 has the highest (δ18O=16% δD=19%) and Aquifer F3 has the lowest (δ18O=9% δD=7%) proportions of rainfall recharge, respectively. On the other hand, Aquifer F3 has the highest (δ18O=91.3% δD=93%) and Aquifer Fl carries the lowest (δ18O=84% δD=81%) proportions of lateral recharge from the mountain area, respectively. These results show that the groundwater for the deeper aquifer of Lin Bian River area has relatively higher recharge from the mountain river, while in the shallower aquifer the rainfall recharge is the dominant factor.

並列關鍵字

Lin Bian River ； Groundwater recharge ； Groundwater flow direction ； Hydrogen and oxygen stable isotopes