• Title, Summary, Keyword: 채수

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Development of a Water Sampling System for Unmanned Probe for Improvement of Water Quality Measurement (수질측정 방법 개선을 위한 무인 탐사체의 채수장치 개발방안)

  • Jung, Jin Woo;Cho, Kwang Hee;Kim, Min Ji
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.35 no.6
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    • pp.527-534
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    • 2017
  • The purpose of this study is to develop unmanned equipment that can automatically move to the desired point and measure water quality at the correct depth. For this purpose, we constructed a water sampling lift and water sampling container, an unmanned vessel equipped with a VRS-GPS, an acoustic echo sounder, and a water quality sensor. Also, we developed an automatic navigation algorithm and program, an automatic water sampling program, and a water quality map generation program. As a result of the experiment in the detention pond, the unmanned vessel sailed along the planned route with an accuracy of about 93% within the error range of 3m. In addition, the water quality sensor installed in the lift was able to acquire the water quality of the target area in real time and transmit it to the server via wireless Internet, and it was possible to monitor the water quality of each site in real time. Through field experiments, the water sampling lift was able to control the desired length with an accuracy of about 94%. The stretch length accuracy experiment of the water sampling lift was impossible to measure directly in the water, so it was replaced land-based experiment. We also found some unstable problems due to the weight of the water sampling lift and the weight of the air compressor to operate the water container. Except these two problems, we accomplished purpose of this study. An automated water quality measurement method using an unmanned vessel can be used to measure the quality of water in a difficult to access area and to secure the safety of the worker.

Effect of Sampling Frequency for the Storm Runoff on BOD, T-P Loads Estimation of the Mixed Landuse Watershed (강우-유출 채수간격이 복합지목 유역의 BOD, T-P 부하량 산정에 미치는 영향)

  • Park, Hyunkyu;Beom, Jina;Choi, Dongho;Jung, Jaewoon;Jeung, Minhyuk;Kim, Youngsuk;Choi, Yujin;Jo, Youngjun;Yoon, Kwangsik
    • Journal of Wetlands Research
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    • v.20 no.4
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    • pp.314-321
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    • 2018
  • In order to quantify nonpoint source pollution, it was proposed to sample at regular intervals of 1 hour for the first 24 hours of storm runoff process by National Institute of Environmental Research for the mixed landuse watershed. However, high frequency sampling requires intensive laboratory analysis and labor costs. In order to investigate the effect of longer sampling interval on the load estimation compared to the 1 hour sampling method, analysis was conducted using monitoring data from rural subwatershed, urban subwatershed, and outlet of the Pungyeongjeongcheon watershed. Statistical analysis revealed that mean of load estimation was not significantly different up to 4 hour sampling frequency. However, 3 hour sampling interval was found to be appropriate for the BOD and TP when it is judged that 10% or less of the difference in loading amount between the 1 hour and other sampling interval is reasonable. The results of this study can be used to conduct an effective monitoring system.

Quality Control to Improve Reliability of Automatic Water Quality Data (수질자동측정망 자료의 신뢰성 제고를 위한 정도관리)

  • Lim, Byung-Jin;Hong, Eun-Young;Kim, Hyun-Ook
    • Korean Journal of Ecology and Environment
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    • v.43 no.2
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    • pp.338-344
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    • 2010
  • The automatic water quality monitoring system (AWQMS) have been installed to immediately response to any pollution incident. It also make it possible to conduct the task efficiently regarding water quality control. The purpose of this study is to enhance reliability by securing accuracy of automatic water quality data through quality assessment (QA) for temperature, pH, dissolved oxygen (DO), electric conductivity (EC), total organic carbon (TOC). The result of comparison between manual and automatic data, relative accuracy of general items (temperature, pH, EC, DO) and TOC were mostly satisfied with guideline (i.e. less than 20%). On the other hand, relative accuracy of DO between sampling site and housing site was somewhat against the guideline. The contamination by attaching algae and microorganism in the pipeline is considered as main cause. After backwashing the pipeline, DO concentration was increased up to 53%. Therefore, pipeline management is recognizable as important thing to secure reliability of water quality data.

Distribution of Haptophyte Algae in Coastal Waters of Korea (한국 연안해역의 착편모조 분포)

  • 김형신;정민민
    • Journal of Aquaculture
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    • v.17 no.2
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    • pp.133-138
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    • 2004
  • Haptophyte algae were collected at 67 sites in the East Sea, the Yellow Sea and the South Sea of Korea from October 2002 to April 2003. In the Yellow Sea, the seawater samples occasionally were collected in nearshore pools during low tide events. Haptophyte algae also were observed in samples from lagoons that contained some degree of salts from the East Sea. Haptophyte algae consisted of Prymnesium sp. of. parvum, Chrysochromulina spp. and Phaeocystis globosa.

A Study on the Variation of the Surface and Groundwater Flow System Related to the Tunnel Excavation in DONGHAE Mine Area (II) - Hydrogeochemical Consideration (동해신광산 터널굴착공사와 관련된 지표수 및 지하수의 유동변화에 대한 조사연구 (II)-수리지구화학적 고찰)

  • 전효택;이희근;이종운;이대혁;류동우;오석영
    • Journal of the Korean Society of Groundwater Environment
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    • v.4 no.1
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    • pp.27-40
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    • 1997
  • The hydrogeochemical study on the 15 natural waters was carried out in the vicinity of tunnel excavation site of Donghae largely composed of granite and limestone. The water samples can be classified based on their chemical characteristics into two groups; waters draining in the granitic region(group 1) and the limestone region(group 2). This classification was also confirmed by statistical examination through cluster analysis, and the tunnel seepage waters collected at the same site appear to be included in group 1 and 2 by their sampling period, respectively. According to factor analysis, the waters of group 1 art mainly represented by the weathering of plagioclase to kaolinite and those of group 2 are characterized by the dissolution of calcite. Different properties of the tunnel seepage waters are thought to be resulted from the effective waterproofing processes conducted during the sampling interval to the surface and subsurface leakage zones at the granitic region, which contributed to the change of groundwater flow system. However both the tunnel seepage waters seem to have thermodynamically interacted with rock-forming minerals in their wallrocks. The mixing ratio of the waters from two groups and water-rock interactions are evaluated quantitatively for the tunnel seepage waters through the mass balance approach, and the results are identical with the previous conclusions in this study.

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Effect of Sampling Frequency During Storm Period on Estimation of Pollutant Load from Paddy Field (강우시 채수빈도가 논 오염부하량 산정에 미치는 영향)

  • Han, Kuk-Heon;Kim, Jin-Ho;Lee, Jong-Sik;Lee, Jeong-Taek;Cho, Jae-Young;Yoon, Kwang-Sik
    • Korean Journal of Environmental Agriculture
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    • v.24 no.1
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    • pp.17-23
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    • 2005
  • In order to examine effects of sampling frequency during rainfall-runoff process from paddy field on the estimation of pollution load, EMCs of several water sampling frequencies were examined. Water quality samples were conducted by every two hours interval for each event. It was found that difference of load estimation between five times sampling and two hours consecutive sampling during rainfall-runoff showed $15.2{\sim}-15.2%$ for T-N, $20.0{\sim}-26.2%$ for T-P, $28.6{\sim}-35.7%$ for the SS, respectively. In the same way, the effects of number of sampling data on estimation of pollution load using runoff-mass load(L-Q) method were investigated. L-Q equation made of five times sampling data provided 10% differences in estimation of mass loads of T-N, T-P, and SS when compared to those by L-Q equation using entire two hours consecutive sampling data during runoff process.

A Study on the Characteristics of the Seawater Seepage According to Stratum Structures (지층구조에 따른 해수 침투 특성 분석)

  • Ahn, Seung-Seop;Park, Dong-Il;Jung, Do-Joon;Moon, Sang-Cheol
    • Proceedings of the Korea Water Resources Association Conference
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    • pp.1982-1985
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    • 2010
  • 해수침투는 대수층의 염분 농도를 증가시켜 지하수 염분화에 의한 용수의 부족 등을 야기시키며 다른 지하수 오염과 마찬가지로 회복에 대한 막대한 비용과 시간이 소모되어 피해지역에 대한 정확한 현황파악이 어려워 피해방지대책의 수립이 필요한 실정이다. 따라서 본 연구에서는 흐름과 이송을 모의할 수 있는 GMS-FEMWATER 모델을 이용하여 대상지역의 지층구조를 구분하고 실제 대상지역의 지층과 동일하게 모델링하여 해안지역의 해수침투에 대한 특성을 규명하였다. 분석결과 양수기간이 길어 질수록 지하수두강하 폭이 양수기간 30일, 60일, 90일 및 180일 경과 시 초기 수위에서 점차 4.25m (1.36%), 3.5m (1.13%), 2.96m (0.97%), 1.97m (0.65%)으로 감소하는 것을 알 수 있었다. 또한 양수량이 많은 관정일수록 해수 침투가 큰 것을 알 수 있다. 양수기간 30일 0.59mg/l, 채수 60일 1.65mg/l, 채수 90일 3.14mg/l, 180일 5.55mg/l으로 분석되었다. 이결과로 볼 때 양수기간 초기에서 기간이 지날 수록 해수침투가 큰영향을 주는 것을 알 수 있었다.

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