• 지질공학
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• 제4권3호
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• pp.297-309
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• 1994

전국 210개 시군을 대상으로 지역별 지하수 이용량을 예측하는 기법을 개발하였다. 우선 210개 대상지역은 각 지역 지하수 이용 특성에 따라 생활형, 공업형, 농업형 지역으로 대분하고, 이들로부터 각 지역별 특성을 잘 나타내는 표본(생활형 22개 : 공업형 8개 : 농업형 32개)지역을 선정하였다. 이 지역에서 지하수 이용에 연관 가능한 인자들로 1) 농지면적, 2) 공업부지 면적, 3) 행정단위 면적, 4) 인구, 5) 지하수원 상수도 시설용량, 6) 1인 1일 평균수량, 7) 농업용수 사용량, 8) 공업용수 사용량, 9) 생활용수 사용량, 10) 상수도 보급률 등을 선정하고 이들의 자료를 수집 분석하였다. 이들과 지역별 지하수 이용량과의 관계를 분석한 결과 얻어진 상관계수를 t-test 방법으로 신뢰도 95%와 99%에서 그 관계의 중요성을 검증하였고, 이로부터 영향인자를 도출하였다. 이와 같이 도출된 영향인자들을 사용하여, 다중 회기분석법으로 생공형 지역과 농업형 지역에서의 지하수 이용량을 추정하는 관계식을 두출하였고, 이 식으로부터 얻어진 예측치를 실제 이용량과 비교하여 그 오차의 RMS를 최소화하도록 보정하였다. 이 모델은 미래 자료에 의하여 타당성이 검증된 후, 지역별 지하수자원의 개발 계획 수립시 최대 수요량의 예측에 사용될 수 있다.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2003년도 학술발표논문집
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• pp.311-314
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• 2003

This research recognized change of the specific yield(Sy) by groundwater level in small size tube well of the farm village area. The result research basin aquifer could quality that the specific yield according to geological quality of aquifer changes showed value of $0.0004{\sim}0.081$ extents according to groundwater level decline.

• Journal of Applied Biological Chemistry
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• 제42권4호
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• pp.186-190
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• 1999

Isotope ratio ($^{15}N/^{14}N$) and nitrate-nitrogen concentration in groundwater were measured to investigate the effect of chemical fertilizer and livestock manure on temporal variations in nitrate-nitrogen concentration and to estimate the contribution of fertilizer and manure to groundwater contamination by nitrate. Four study wells from a rural area in Kyonggi province were selected. One well was located on an upper site from a livestock feedlot, and the others were situated at lower sites from the feedlot. The ${\delta}^{15}N$ values were analyzed by a stable isotope ratio mass spectrometer (Micromass, VG Optima IRMS). Reproducibility of the method and precision of the mass spectrometer were below 1.0 and 0.1‰, respectively Even though study wells were located at the same area, nitrate-nitrogen concentrations and ${\delta}^{15}N$ values differed and fluctuated during the sampling period. The ${\delta}^{15}N$ values of well located at upper site from the feedlot were extremely variable (-1.48~20.80‰). The ranges of ${\delta}^{15}N$ value of three wells situated at lower sites from the feedlot were 11.83~20.73 (ave. 16.11), 8.90~11.73 (ave.11.01), and 5.29~12.73‰ (ave. 8.21‰) with increasing distance from the feedlot. The average values of contribution proportion of nitrogen derived from livestock manure to nitrate-nitrogen in groundwater were 79% for the well closet to the feedlot, 44% for the well most distant from the feedlot, and 56% for the well in between the two wells.

• 한국환경농학회지
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• 제24권3호
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• pp.261-269
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• 2005

농업활동 및 지하수의 입지적 조건이 시설재배지 지하수의 $NO_3-N$함량에 미치는 영향을 알아보고자 영남지역 10개 시군의 주요 시설재배단지에서 지하수 1370 지점의 $NO_3-N$ 함량을 조사하고, 재배조건으로서 시설재배지의 경작년수, 퇴비시용량, 제염방법 및 입지적 조건으로서 지하수깊이, 점토함량, 배수등급 등을 조사하였다. 조사된 지점 중 천층지하수의 19.7%, 암반지하수의 1.3%가 우리나라 음용수 수질기준인 $10mg/{\ell}$를 초과하였고, 농업용수 수질기준인 $20mg/{\ell}$를 초과하는 지점은 천층수 6.3%, 암반수 0.4%로 나타났다. 지하수 $NO_3-N$함량과 가장 상관이 높은 것은 점토함량 및 지하수깊이로 1% 수준에서 유의성이 인정되었다(점토함량 $r=-0.241^{**}$, 지하수깊이 $r=-0.228^{**}$). 재배조건에 따라서는 경작년수와 5% 수준에서 유의성이 인정되었으나(경작년수 $r=0.104^*$), 퇴비시용량 등과는 상관관계가 인정되지 않아 재배조건과 같은 농업활동보다는 토성과 깊이 등의 입지적 조건이 지하수 $NO_3-N$함량에 더 영향을 미치는 것으로 나타났다. 또한 천층수의 $NO_3-N$과 암반수의 $NO_3-N$ 함량 사이의 상관을 조사한 결과 양자 사이에는 고도의 정(正)의 상관$(r=0.532^{**})$이 인정되어 천층수의 수질이 암반수 $NO_3-N$함량에 영향을 미침을 알 수 있었다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제18권3호
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• pp.119-133
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• 2013

In the present study, several groundwater vulnerability assessment methods were applied to an agricultural area of Gumma in Korea. For the groundwater intrinsic vulnerability assessment, the performance of DRASTIC, SINTACS and GOD models was compared and an ensemble approach was suggested. M-DRASTIC and multi-linear regression (MLR) models were applied for the groundwater specific vulnerability assessment to nitrate of the study site. The correlation coefficient between the nitrate concentration and M-DRASTIC index was as low as 0.24. The result of the MLR model showed that the correlation coefficient is 0.62 and the areal extents of livestock farming and upland field are most influential factors for the nitrate contamination of groundwater in the study site.

• 한국농공학회:학술대회논문집
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• 한국농공학회 1999년도 Proceedings of the 1999 Annual Conference The Korean Society of Agricutural Engineers
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• pp.747-752
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• 1999

The effects of nonpoint source pollutants from a small agricultural alluvial watershed on groundwater quality were investigated and analyzed in this study . Water quality factors of pH, electric conductivity(EC), total nitrogen(T-N), nitrate nitrogen(NO3-N), ammonium nitrate(NH4-N), and total phosphorus(T-P) concentrations were monitored at the watershed located in Shinbook-myon , Chunchon, Kangwon-Do, Korea for 2 years. Groundwater samples of about 2 liters from 7 to 20 farm wells were regulary collected and analyzed with respect to the water quality factors which were again anlayzed with respect to time and land uses of residential , agricultural , livestock feedlot, greenhouse, and natural areas.

• 상하수도학회지
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• 제35권6호
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• pp.497-505
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• 2021

This paper investigates the current status of Jeju special self-governing province (JSSGP)'s water infrastructure and recommends directions for improvement. JSSGP relies on groundwater for most of its water resources. Recently, water usage has been steadily increasing due to the increase of residents and tourists while the quality of groundwater has been steadily worsening. Deterioration in water quality of groundwater can be seen through the increase in concentration of nitrate nitrogen and microorganisms. To overcome such problems, water consumption must be reduced by water demand management in all fields including residential and agricultural water use. The quality of water resources should be preserved through the management of pollutants. For efficient management of water resources, great efforts should be made to reduce the leakage rates in household and agricultural water, which is currently at the highest level in the country. Furthermore, diversification of water intake sources other than groundwater is needed, especially for agricultural water supply. For water and sewerage facilities, compliance with drinking water quality standards and discharge water quality standards must be achieved through the optimization of operation management. This process requires recruiting professionals, improving existing workers' expertise, and improving facilities.

• 한국환경과학회지
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• 제22권5호
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• pp.639-649
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• 2013

Over 96.2% of the agricultural water in Jeju Island is obtained from groundwater and there are quite distinct characteristics of agricultural water demand/supply spatially because of regional and seasonal differences in cropping system and rainfall amount. Land use for cultivating crops is expected to decrease 7.4% (4,215 ha) in 2020 compared to 2010, while market garden including various vegetable crop types having high water demand is increasing over the Island, especially western area having lower rainfall amount compared to southern area. On the other hand, land use for fruit including citrus and mandarin having low water demand is widely distributed over southern and northern part having higher rainfall amount. The agricultural water demand of $1,214{\times}10^3\;m^3/day$ in 2020 is estimated about 1.39 times compared to groundwater supply capacity of $874{\times}10^3\;m^3/day$ in 2010 with 42.4% of eastern, 103.1% of western, 61.9% of southern, and 77.0% of northern region. Moreover, net secured amount of agricultural groundwater would be expected to be much smaller due to regional disparity of water demand/supply, the lack of linkage system between the agricultural water supply facilities, and high percentage of private wells. Therefore, it is necessary to ensure the total net secured amount of agricultural groundwater to overcome the expected regional discrepancy of water demand and supply by establishing policy alternative of regional water supply plan over the Island, including linkage system between wells, water tank enlargement, private wells maintenance and public wells development, and continuous enlargement of rainwater utilization facilities.

• 한국물환경학회지
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• 제28권5호
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• pp.743-753
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• 2012

The hydrologic models, capable of simulating groundwater recharge for long-term period and effects on it of crops management in the agricultural areas, have been used to compute groundwater recharge in the agricultural fields. Among these models, the Soil and Water Assessment Tool (SWAT) has been widely used because it could interpret hydrologic conditions for the long time considering effects of weather condition, land uses, and soil. However the SWAT model couldn't represent the spatial information of Hydrologic Response Unit (HRU), the SWAT HRU mapping module was developed in 2010. With this capability, it is possible to assume and analyze spatio-temporal groundwater recharge. In this study, groundwater recharge of rate for various crops in the Mandae stream watershed was estimated using SWAT HRU Mapping module, which can simulate spato-temporal recharge rate. As a result of this study, Coefficient of determination ($R^2$) and Nash-Sutcliffe model efficiency (NSE) for flow calibration were 0.80 and 0.72, respectively, and monthly groundwater recharge of Mandae watershed in Haean-myeon was 381.24 mm/year. It was 28% of total precipitation in 2009. Groundwater recharge rate was 73.54 mm/month and 73.58 mm/month for July and August 2009, which is approximately 18 times of groundwater recharge rate for December 2009. The groundwater recharges for each month through the year were varying. The groundwater recharge was smaller in the spring and winter seasons, relatively. So, it is necessary to enforce proper management of groundwater recharge during droughty season. Also, the SWAT HRU Mapping module could show the result of groundwater recharge as a GIS map and analyze spatio-temporal groundwater recharge. So, this method, proposed in this study, would be quite useful to make groundwater management plans at agriculture-dominant watershed.

• 지구물리
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• 제8권3호
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• pp.145-152
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• 2005

울산 도시지역 지하수의 수질 특성을 파악하기 위하여 216개의 일반 수질분석과 168개의 VOCs 분석이 이루어졌으며, 이를 주거․상업지역, 공업지역, 농업지역, 산림지역으로 구분하여 토지이용과 지하수 수질과의 관계를 분석하였다. 전반적으로 보아서 남구 태화강 저지대 일대 주거․상업지역 지하수에서 과거 해수의 영향에 의해서 Na와 Cl의 함량이 높다. NO3는 농업지역, VOCs는 공업지역 지하수에서 높은 함량을 보이기도 하지만, 토지용도별 지하수의 수질오염 특성 구분은 어렵다. 아직까지 연구지역 지하수의 오염은 우려할만한 수준은 아니나, 도시화가 계속 진행되고 있기 때문에 계속적인 관찰이 요구된다.