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지하수측정망을 이용한 강변 시설재배지역 지하수 수온과 전기전도도 변화 특성 분석
백미경 ( Baek Mi Kyung ),김상민 ( Kim Sang Min ) 한국농공학회 2023 한국농공학회 학술대회초록집 Vol.2023 No.0
기후변화 시기에 농업용수의 안정적인 공급을 위하여 전국적으로 지하수의 수위, 수질변동 현황 및 변화추이 등을 조사 분석하는 국가측정망과 다양한 보조측정망이 설치되어 수위, 수온, 전기전도도가 측정되고 있다. 시설재배지역의 면적이 증가하고 있으며 비료성분에 의한 염류이동은 지하수 오염을 가속화하고있다. 수막재배로 인한 동절기 집중사용으로 인해 지하수위 저하와 전기전도도(EC)의 증가가 관측되고있으며, 측정망의 심도에 따라 전기전도도의 변화가 다른 양상을 보인다. 시설재배 밀집지역의 수온과 전기전도도 특성을 분석하기 위하여 낙동강인근에 위치한 시설재배지역의 보조측정망 관측자료를 활용하였으며 일반농업지역의 수질특성과 비교분석하였다. This study aimed to analyze the impact of water curtain cultivation in the greenhouse complexes on groundwater's electric conductivity and water temperature. The greenhouse complexes are mainly situated along rivers to secure water resources for water curtain cultivation. We classified the groundwater monitoring well into the greenhouse (riverside) and field cultivation areas (plain) to compare the groundwater impact of water curtain cultivation in the greenhouse complex. The groundwater observation network in Miryang was selected for the study. As a result of analyzing the electric conductivity(EC) and water temperature, the following differences were found in the observed characteristics by region. 1) The EC and water temperature of the riverside area, where the permeability is high and close to rivers, showed a constant pattern of annual changes. 2) The flat land in general agricultural areas showed general characteristics of bedrock observation in the case of water temperature. Still, it seemed more affected by the surrounding well's water use and water quality.
비정상 피복열선법 열전도도 측정시 시간-온도 특성에 대한 점근해
배철호 대한기계학회 1995 대한기계학회논문집 Vol.19 No.7
A large time asymptotic solution for an unsteady heat conduction problem of a coated hot wire thermal conductivity measurement process was theoretically found. The solution revealed that the slope of wire temperature versus logarthmic time, which is used to evaluate the thermal conductivity, remains unchanged for large values of time even if a layer of coating is present on the hot wire. The significance of this result is that the thermal conductivity of an electrically conductive fluid can be measured with a coated hot wire using the same conversion relation as for a bare wire.
Experimental Comparative Study on Devices Measuring Field Moisture Content of Roadbed Materials
이상익,오정호,Sebesta, S.D. 한국방재학회 2015 한국방재학회논문집 Vol.15 No.6
For in-place moisture content measurements as a part of quality control (QC) of roadbed construction, many agencies rely on nuclear testing and physical gravimetric drying for moisture content measurements. In this study, alternative methods were initially evaluated to identify technologies that could be used to measure moisture content in the field substitute using gravimetric, dielectric, and electrical conductivity, and suction-based methods. The small scale field test and actual field tests were then performed to evaluate device bias and accuracy, and estimates of single-operator standard deviation of repeat measurements. Through those results, the list of most promising devices could be narrowed down.