Both the smelter and acid mine drainage (AMD) in uppermost streams impact water geochemistry deteriorate quality. Efficient quality management requires identifying contribution of each source to stream geochemistry. In this study, we aimed determine natural anthropogenic sources (AMD smelting) affecting by considering seasonality. Water samples were collected, from May 2020 April 2021, a main channel (Nakdong River) tributaries small watershed including mines smelters. The is characterized...

물의 <TEX>$^{18}O/^{16}O$</TEX>와 <TEX>$^2H/H$</TEX> 조성을 레이저를 이용하여 분석하는 기술은 기존의 IRMS를 이용한 분석방식에 비해 간편한 시료 전처리, 쉬운 장비 유지보수와 현장에서도 응용이 가능하다는 장점을 가지고 있다. 현재 사용되는 레이저 방식을 안정동위원소 분석은 분석원리에 따라 OA-ICOS(Off-Axis Integrated Cavity Output Spectroscopy)를 방식과 WS-CRDS(Wavelength-Scanned Ring-Down 방식으로 구분된다. WS-CRDS 방식은 기화된 물 시료를 질소 가스를 이용해 광학 공동(optical cavity)로 이동시킨 후 특정 파장에서의 동위원소체가 있는 흡수도와 투과시켜 공동을 투과하여 나오는 신호의 감쇠시간의 비측정을 통해 수 ppb에서 수십 ppt까지의 감도로 조성이 측정 가능하다. 이 연구에서는 방식의 분석원리와실제 물시료를 활용하여 기기의 안정성과 동위원소비...

Nitrate sources in surface water have been identified using dual-isotope compositions of nitrate with various tools to efficiently manage the quality at local scale. Correlation between Cl and NO3 has also used identify NO3. In this study, we assess reliability approach terms source apportionment. To end, collected stream samples throughout South Korea estimate streams determine whether land-use pattern was closely related sources. The δ15N–NO3 ranging from −1.3 14.8‰ showed a spatial...

This study presents the spatial distributions of stable isotopes for groundwater according to well depth and spring water across South Korea, using an interpolation model provide baseline information hydrological studies. In total, 888 108 samples were collected Korea; their oxygen hydrogen isotopic compositions (δ18O δ2H) analyzed. δ18O δ2H values biased toward summer local meteoric line low d-excess indicate that precipitation is important recharge. The decrease progressively from...

Noseong Stream watershed in Nonsan, Chuncheongnam-do, South Korea. This study aims to identify and quantify groundwater inflow a stream based on the spatial temporal distributions of 220Rn 222Rn activities water groundwater. Groundwater–stream exchange fluxes were estimated basis mass balance approaches under losing gaining conditions, type was identified using survey water. The at 20 stations along during four sampling campaigns higher high altitudes than low altitudes, regardless season....

Two kinds of bottled mineral water from wells located in the northern (Baeksansu, BSS) and southern (Baekdusansu, BDS) areas near Mt. Baekdu (Changbai) were collected order to monitor chemical compositions groundwater a potential volcanic area. The was produced between August 2014 June 2017, corresponds Na-HCO3 type. trend variation each component two waters different. BDS area showed dramatic change composition during study period, whereas BSS did not show any significant composition. In...

Noseongcheon catchment is a mesoscale agricultural basin with crystalline bedrocks seasonally variable precipitation and groundwater use. This study aimed to assess the influence of headwater streams on streamflow across stream network in area under temperate monsoonal climate conditions. Using hydrochemical parameters stable isotopes water dry rainy seasons, sources contributing were identified seasonal changes system evaluated. Seasonal variations indicated that contributions major changed...

The Korean bottled water market has continuously expanded during the last 25 years. However, in-depth studies of its geochemistry have not been conducted. Four types manufactured in South Korea (i.e., natural mineral water, NMW; functional FW; carbonated CW; and desalinated seawater, DSW) were investigated to classify type, verify accuracy ion contents detailed on bottle labels, decipher origin sources using major trace elements their isotopes. waters was classified into three types:...

Variability in precipitation due to climate change causes difficulties securing stable surface water resource, which requires understanding of relation between and stream discharge. This study simulated discharge a small mountainous forested catchment using antecedent index (API) models represent variability saturation conditions soil layers depending on rainfall events. During 13 months from May 2015 2016, were measured at the outlet central part watershed, respectively. Several API with...

Radon (222Rn) and uranium (U) measurements were conducted in 98 groundwater samples Yongin area, Korea to identify the factors controlling their levels spatial distributions. Groundwater obtained from different depth of wells used for drinking water irrigation. 222Rn U concentrations measured using a liquid scintillation counter (LSC) equipped with pulse-shape analyzer inductively coupled plasma mass spectrometers (ICP-MS), respectively. Large variations observed U, ranging between 0.6 ±...

제주도 남측사면에서 산악지역부터 해안지역에 걸쳐 분포하는 용천수에 대해 풍수기와 갈수기의 2회에 측정된 <TEX>$NO_3$</TEX> 농도를 수해지질학적 인자 및 토지 이용 특성 인자를 포함하는 공간 변수들의 다중선형 회귀모형으로 예측하였다. 용천수의 농도는 평균 20 mg/L이며, <0.02~86 mg/L의 범위를 보여 인위적 오염의 정도가 매우 다양하다. 변수는 용천수를 중심으로 원형 버퍼를 설정하여 추출하였으며, 수정결정계수 증가율과 버퍼의 제한점을 고려하여 반경 400 m를 최적 범위로 설정하였다. 선택된 회귀 모형들은 p-값과 더빈-왓슨 통계치에 근거하여 모두 통계적으로 유의하였다. 설명변수는 수정결정계수, Cp (total squared error), AIC (Akaike's Information Criterion)등을 기준으로 선택하였으며 유의성과 다중공선성을 확인하여 모형을 제시하였다. 일부 용천수들은 이상치로 확인되었으나 전체 시료의 10%이내였으며, 이들은...

It is reported that the intensity of rainfall will likely increase, on average, over world 2000. For water resources security, many studies for flow paths from or snowmelt to subsurface have been conducted. In Korea, few isotopic characterizations path undertaken. a better understanding how derived atmosphere moves and stream, an analysis precipitation stream using oxygen-18 deuterium isotopes in small watershed, Dorim-cheon, Seoul, was conducted with high resolution data. Variations greater...

DATA REPORT article Front. Environ. Sci., 24 October 2023Sec. Atmosphere and Climate Volume 11 - 2023 | https://doi.org/10.3389/fenvs.2023.1279004