• 자원환경지질
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• 제40권4호
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• pp.389-401
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• 2007

2001년부터 2004년까지 유성 소유역내 강수, 지하수, 지열수의 산소 및 수소 동위원소 조성 변화를 검토하였다. 1975년부터 2006년까지의 강수 패턴을 분석한 결과, 연구지역은 $6{\sim}7$년의 가뭄 주기성을 보였다. 2001년도 가뭄 시기부터 2004년까지 4년간 강수의 산소 수소 동위원소 조성은 점차 무거운 성분으로 변화해가는 양상을 보였다. 연구 지역에서 4년간의 강수량을 고려한 동위원소의 가중 평균간을 구해 보면 ${\delta}^{18}O=-7.7%o,\;{\delta}D=-51%o$로서, 동일 기간 내의 지하수와 지열수의 동위원소보다 무거운 조성 범위를 보였다. 이는 연구 지역의 지수 및 지열수가 동위원소적 관점에서 2-3년 이내의 강수에 의해 큰 영향을 받지 않는 것을 의미한다. 기존 자료들을 검토해 볼 때, 연구지역에서의 지하수와 지열수는 1990년과 1992년이 가장 무거운 동위원소 조성을 보였으며 이후로는 산소 및 수소 동위원소 조성이 점차 가벼워지는 쪽으로 변화해가는 양상을 보였다.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2004년도 총회 및 춘계학술발표회
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• pp.408-412
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• 2004

A total of 23 springs distributed in the southern and northern sides of Mt. Hala in Jeju Island were seasonally sampled and analyzed for their major ion chemistry and oxygen and hydrogen isotope compositions to investigate their hydrogeochemical and isotopic characteristics. Dissolved ion concentrations of the south-side springs slightly increase with decreasing altitude. This indicates that dissolved ion concentrations of groundwater recharged at higher altitudes increase by water-rock interaction during the downgradient migration of groundwater through highly permeable volcanic aquifer. Dissolved ion concentrations of the north-side springs also slightly increase with decreasing altitude, but dramatically increase at ～300 m.a.s.l. This may indicate a sudden input of contaminants to the north-side groundwater system around ～300 m.a.s.l. Springs located in areas above ～300 m.a.s.l. have very low concentrations of dissolved ions, showing little seasonal variations. Whereas springs located in areas below ～300 m.a.s.l. show a big seasonal variation in the concentration of dissolved ions. Seasonal variation of oxygen isotope compositions of springs is ～3$\textperthousand$ for high-altitude springs (～1700 m.a.s.l.) and is ～2$\textperthousand$ near shore, indicating an attenuation of the variation through mixing with other groundwater bodies during migration.

• 자원환경지질
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• 제30권4호
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• pp.321-325
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• 1997

In this paper an attempt is made to explain some of the factors controlling oxygen and hydrogen isotopic variations of precipitation in Pohang by analysing the IAEA data (1961~1976) through statistical correlations and trend observations. During this period, the values of ${\delta}^{18}O$ and D varied widely from -17.80 to +0.07‰, and from -131.9 to +7.7‰, respectively, and fall along a local meteoric water line defined by ${\delta}D=(8.05{\pm}0.32)$ ${\delta}^{18}O+(12.72{\pm}2.44)$ (n=108, ${\gamma}^2=0.86$). The ${\delta}^{18}O$ and ${\delta}D$ values of the precipitation appear to be little dependent on temperature. Although the amount effect is clearly shown in summer precipitation of 1963 and 1965, the isotopic composition of summer precipitation seems not to be greatly dependent on the amount of precipitation.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2000년도 추계학술대회
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• pp.232-236
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• 2000

Multi-regression statistical analyses were applied for the water quality data of shallow alluvial ground water (n = 47) collected from the Youngdeok area, in order to quantitatively generalize the natural (non-anthropogenic) causes of regional water quality variation. Seven samples having the high contamination index ( $C_{a}$ > 3) reflect the striong effects by anthropogenic activity. Most of the alluvial groundwaters have acquired their quality primarily due to the dissolution of carbonate minerals. The results of multi-regression analysis show that chlorine is mainly derived from seawater effect. Sulfur isotopic compositions of dissolved sulfur and the S $O_4$/Cl ratio also enable us to discriminate the samples (n = 18) which are affected by atmospheric input of marine aerosol (sea-spray) and also by mixing between freshwater and seawater. Hydrogen and oxygen isotope data of the samples collected lie close to the local meteoric water line obtained from nearby Pohang city but has lower slope (5.45) on the $\delta$D-$^{18}$ O plot, indicating that alluvial groundwater was recharged from infiltrated meteoric water which has undergone some degree of kinetic evaporation. The estimated initial isotopic composition of the recharged water ($\delta$D = -74.8$^{0}$ /$_{00}$, $\delta$$^{18}$ O = -10.8$^{[-1000]}$ /$_{[-1000]}$ ) suggests that the alluvial ground water recharge largely occurs during summer storm events.s.s.

• 자원환경지질
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• 제30권1호
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• pp.25-33
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• 1997

The purpose of this study is to examine the feasibility of using stable isotopes as a hydrologic tracer, and to elucidate the groundwater circulation system and the source of S component dissolved in thermal water of the Chonju Jukrim thermal spring district based on the O, H and S isotopic variabilities of environmental materials including bedrock, rainwater, surface water, shallow subsurface water and thermal spring water. The ${\delta}^{18}O$ and ${\delta}D$ of subsurface waters and surface water show highly restricted range and plotted on the same meteoric water line as a ${\delta}D=8{\delta}^{18}O+19$ line, and derivate from the mean annual isotopic composition of the rain water but are analogous to those of rain waters precipitated during winter season, indicating that ground waters are originated from the meteoric water and are strongly affected by the seasonal variation of air mass. Thermal spring waters are more depleted in ${\delta}^{18}O$ and ${\delta}D$ than those of shallow ground water and surface water. It can be explained by the difference of recharge area. The hydrochemical properties of subsurface waters and surface water devide into two groups: $Ca(HCO_3)_2$ type including shallow subsurface water and surface water, and $Na(HCO_3)$ type of thermal spring waters. The ${\delta}^{34}S$ values of thermal spring water show very high positive and quitely distinct from those of shallow subsurface water and surface water that are similar to those of bed rocks, indicating that sulfate dissolved in thermal spring water has not only a terrigenic origin, but also originates partially from the foreign source containing very heavy ${\delta}^{34}S$ component such as an ancient sea water. However, the presence of $H_2S$ can not be ignore the affact of the isotopic fractionation to explaine the heavy ${\delta}^{34}S$ of thermal spring water. Overall, the Oxygen and Hydrogen stable isotopes can identify the source and the circulation system of the natural waters and the S-isotopes can provide a crucial clue on tracing the dissolved material transports in the circulation system of the natural water.