• 제목/요약/키워드: Donghae

검색결과 374건 처리시간 0.024초

동해 폐탄광 일대 산성 광산폐수의 중화처리 (Neutralization Processes of Acid Mine Drainage (AMD) from the Abandoned Donghae Coal Mine)

  • 김정엽;전효택;오대균
    • 대한지하수환경학회지
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    • 제2권1호
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    • pp.38-47
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    • 1995
  • 이 연구에서는 삼척탄전 내에 위치하는 폐탄광인 동해탄광을 대상으로 산성 광산폐수의 중화 처리를 위한 각종 기초자료를 제시하고자 하였다. 산성 광산폐수의 측정시기에 따른 변화양상을 관찰한 결과 갈 수기에는 각종 잠재적 유독성 원소들의 함량이 증가하며, pH가 하락하여 수질이 악화되는 경향을 보였다. 공업용 소석회는 처리효율 및 경제성을 고려할 경우 산성 광산폐수의 처리를 위한 최적의 중화제로 판단되며, 평형 모델링 결과 중화처리과정에서 Fe는 FeOOH의 형태로, Al은 Al(OH)$_3$, 의 형태로 침전되는 것으로 추정된다. GIS를 이용하여 동해탄광일대 산성 광산폐수 처리시설의 위치를 제시하였으며 수문학적 자료를 이용하여 최대강우량 및 첨두유량을 계산하였다.

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국내항만의 행정서비스 경쟁력측정:DEA접근 (A Measurement of Competition Power of Administration Service in Korean Seaports: DEA Approach)

  • 박노경
    • 한국항만경제학회지
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    • 제20권2호
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    • pp.35-52
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    • 2004
  • The purpose of this paper is to measure the competition power of administration service in Korean Seaports by using the scores of customer satisfaction for administration service investigated yearly from 2000 to 2003 by Ministry of Maritime Affairs & Fisheries. And also, this paper shows the competition power of Korean seaports in terms of efficiency by using DEA(data envelopment analysis) method after measuring the change of productive efficiency scores subject to including and excluding the scores of customer satisfaction for administration service as output variable. The empirical main results of this paper are as follows: First, the efficiency scores of the Ports of Donghae, Gunsan, Jeju, Yeosu, Masan, and Pohang have worsened if the customer satisfaction score is excluded as output variable. Therefore these ports have been influenced by the score of customer satisfaction more positively. Second, the changes of the ranking order by measuring the average efficiency scores of each ports subject to including and excluding the scores of customer satisfaction for administration service as output variable are as follows: Busan(9-->7), Incheon(6-->6), Yeosu(1-->4), Gwangyang(4-->3), Masan (10-->9), Ulsan(5-->5), Donghae(8-->11), Gusan(12-->12), Mogpo(3-->2), Pohang(11-->10), Jeju(7-->8), Daesan(2-->1).

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동해탄광일대의 산성광산배수에서 침전된 페리하이드라이트와 슈워트마나이트에 대한 광물학적 연구 (Mineralogy of Ferrihydrite and Schwertmannite from the Acid Mine Drainage in the Donghae Coal Mine Area)

  • Kim, Jeong-Jin;Kim, Soo-Jin
    • 한국광물학회지
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    • 제16권2호
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    • pp.191-198
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    • 2003
  • 동해탄광 일대에서 산성광산배수가 유입되는 하천의 바닥에는 적갈색과 황갈색의 침전물이 형성되고 있다. 이 침전물에 대한 X-선 회절분석 결과 적갈색 침전물은 대부분 페리하이드라이트이며 소량의 침철석을 포함하고 있는 반면에 황갈색 침전물은 슈워트마나이트로 구성되어 있다. 열분석과 가열 실험에서 페리하이드라이트와 슈워트마나이트는 약 $400^{\circ}C$에서 결정도가 낮은 적철석으로 변화하며 $700 ^{\circ}C$에서는 결정도가 높은 적철석으로 변화한다.

동해탄광 주변 산성광산폐수와 하상퇴적물의 지구화학 (Geochemistry of Acid Mine Water and Stream Sediment around the Donghae Coal Mine)

  • 오대균;김정엽;전효택
    • 자원환경지질
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    • 제28권3호
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    • pp.213-220
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    • 1995
  • Geochemistry of stream water and sediment collected in the vicinity of the Donghae coal mine in the Samchuk coalfied were investigated in order to evaluate the environmental impacts of acid mine drainage. The pH of stream water ranges from 2.85(at 2 km away from the mine) to 7.92(at uncontaminated tributary). The main cation and anion species in the upper stream are $Ca^{2+}$ and $SO_{4}{^2-}$, respectively. The level of pH and the amount of $HCO^{3-}$ in stream water increase to the downstream and where uncontaminated small tributaries are joining, and in the area covered with limestone. From the results of thermodynamic calculation, the main forms of iron in stream water are estimated as $Fe^{2+}$ and $FeSO_{4}{^0}$, and most of them could be precipitated as FeO(OH) with increase of pH. The white precipitates in stream sediments particularly found around the coal mine are proved to be $Al(OH)_3$ by XRD and XRF analysis. As a result of investigation for seasonal variation of AMD, the level of pH decreased and conductivity increased in dry season.

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벽지노선의 지속적 운행을 통한 공익적 가치 측정 : 영동선과 동해남부선을 사례로 (Measuring Public Service Values of Rural Railways : A Case Study of Young Dong and Donghae Nambu Lime)

  • 엄영숙;김채원
    • 한국경영과학회지
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    • 제41권4호
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    • pp.1-13
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    • 2016
  • In response to the government's recent attempts to introduce competition and efficiency criteria in the rural railway service provision, this study is to empirically estimate public service values on continuous operation of two rural railways-Young Dong Line (YDL) and Donghae Nambu Line (DNL)-that will be realized beyond the passengers' use values. Based on a contingent valuation survey conducted on 600 passengers and local residents, YDL respondents were willing to pay significantly higher amount compared to those of DNL respondents. Especially tourists traveling on YDL were willing to pay the highest amount, and local residents of DNL were willing to pay relatively high amount. The results will provide useful information in makings decisions on the selection of PSO railways, the amount of PSO compensation and which railways to close, so on.

실측 파랑자료를 이용하여 추정된 우리나라 동해 연안역의 파력 부존량 비교 (Comparison of Wave Power Resources in the Coastal Zone of the Korea East Sea Estimated by Using Field Measurement Wave Data)

  • 정원무;오상호;이달수;이동영
    • 신재생에너지
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    • 제3권3호
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    • pp.28-35
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    • 2007
  • In this study, the wave power resources at the three locations [Sokcho, Hupo, and Onsan] on the east coast of Korea were estimated by using the field measurement data and were compared with the results of previous researches. It was found that seasonal variation of the wave power is very significant on the east coast of Korean peninsula. The wave power was the smallest in the summer season at all the locations. At Hupo and Onsan, the highest value of the monthly-averaged wave power was observed in September, probably because the pathways of typhoon in September were close to both locations. At the northest location, Sockcho, in contrast, the monthly highest value of the wave power appeared in January, probably owing to the influence of storm waves driven by Donghae twister. The estimated annual average wave power was 4.5 kW/m at Sokcho, which was about two times larger than those at other two locations. It is noteworthy that this result is completely different from past researches based on wave hindcasting data. In addition, the estimates of wave power by the past researches seemed to be smaller than those of the present study, especially at the northern region of the east coast.

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삼중자망에 의한 동해 심해 수산자원의 망목별 어획특성 (Fishing investigation with trammel nets by mesh size in the Korean deep-water of the East Sea)

  • 박해훈
    • 수산해양기술연구
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    • 제49권1호
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    • pp.1-17
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    • 2013
  • The investigation for species composition and catch in the Korean deep-water of the East Sea (also known as Sea of Japan) was carried out with trammel nets of 7 mesh sizes (6.1~24.2cm) offshore Donghae (2006) and Yangyang (2007) of Korea. The catches were 1,268kg and composed of 37 species between 200m and 1,200m in depth. The principal species caught were Taknka's snailfish, salmon snailfish, red snow crab, hunchback sculpin, snow crab, spinyhead sculpin, Tanaka's eelpout, Alaska cod and so on. Those were target fish for commercial value except salmon snailfish. The mesh sizes for the largest catch were 10.6cm and 15.2cm in the fishing ground of Donghae and Yangyang, respectively. The habitat of snow crab was shallower than that of red snow crab in both areas. Trammel net enabled to investigate fish in deep-water with small fishing vessel and rather cheap expenses in contrast to bottom trawl that required too much of it. With increasing inner mesh size of trammel net the mean size of some principal species such as Taknka's snailfish, spinyhead sculpin, hunchback sculpin, Pacific cod, snow crab, red snow crab and hybrid between snow crab and red snow crab tended to be large in certain range of mesh size.

입지유형과 주택경관 상호간의 선호인자에 관한 요인분석 연구 (A Study on the Factor Analysis of preferred elements in Types of Location and Housing landscape)

  • 조원석;김흥기;김정현
    • 한국농촌건축학회논문집
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    • 제8권2호
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    • pp.1-10
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    • 2006
  • Recently the concerns of landscape resources were on the increase about the landscape of control and landscape design. In order to this, purpose of this paper is to develop architectural landscape design data of individual house in Gangwon Provinces. The type of landscape in Donghae seaside consist of three; Road, Mountain, Seaside. And the type of images about individual housing are three; Western, Traditional, Modern. This research is analyzed 18-simulation scenes, factor analysis is used for the SPSS. The results of this study are as follows. First, the housing of western style do not correspond with landscape of Road, but landscape of mountain and seaside were suitable to the western style. Second, mountain in Donghae seaside harmonizes with housing of traditional style. Third, even though the housing of modern style were marked low assessment in three landscape, we found out relation, modern housing was well-matched load landscape. Finally, to improve of landscape housing, which will serve as systematic approach with association of clients, constructors, designers and public service personnel.

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