• 한국해양학회지
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• 제19권2호
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• pp.105-110
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• 1984

수산진흥원에서 15년간(1961-1975) 정기적으로 관측한 한국 주변 182정점의 염분 자료에 대한 조화 분석을 통하여, 한국 주변 동.서.남해표면과 30메타층 염분의 연변화를 분석하였다. 서해 염분의 연평균은 동해에서 보다 낮으며 남해와 동해에서 대마난류의 하류방향으로 갈수록 염분 연변화의 진폭이 줄어들고 위상이 지연된다. 30메타층의 염분은 표면염분에 비하여 평균치는 높으나, 년교차의 폭이 작고 위상이 지연되고 있다. 한국 주변 남해와 동해 염분의 연변화는 주로 국지적 강우량 및 양자강 담수 유출의 계절적인 변화 때문에 일어난다.

• Water Engineering Research
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• 제6권2호
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• pp.73-89
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• 2005

Two kinds of high resolution GCMs with the same spatial resolutions but with different schemes run by domestic and foreign agencies are used to clarify the usefulness and sensitivity of GCM for water resources applications for Korea. One is AMIP-II (Atmospheric Model Intercomparison Project-II) type GCM simulation results done by ECMWF (European Centre for Medium-Range Weather Forecasts) and the other one is AMIP-I type GCM simulation results done by METRI (Korean Meteorological Research Institute). Observed mean areal precipitation, temperature, and discharge values on 7 major river basins were used for target variables. Monte Carlo simulation was used to establish the significance of the estimator values. Sensitivity analyses were done in accordance with the proposed ways. Through the various tests, discrimination condition is sensitive for the distribution of the data. Window size is sensitive for the data variation and the area of the basins. Discrimination abilities of each nodal value affects on the correct association. In addition to theses sensitivity analyses results, we also noticed some characteristics of each GCM. For Korean water resources, monthly and small window setting analyses are recommended using GCMs.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2004년도 학술발표회
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• pp.204-208
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• 2004

In the forthcoming 21C, the barometer of cultural lives depends on that the water demand will increase or not. On the opposite site of that, the small watersheds will influence directly on how to cover the surface of watersheds with land use, no planning developing watersheds, and the rearrangement of small rivers. Espacially as the exordinary climatic phenomena, water resources and water content of the small watersheds will be confused oil exactly not to make a plan of water resources. This study area has four small watersheds groups in Gangwon-Do Province, that is, group I five small river watersheds including Changchoncheon etc., group II fiver rivers watersheds including to Hwalsanmogicheon etc., group III five small river watersheds including Singicheon etc., group IV including to Sabulanggolcheon etc. According to the land use such as dry field(or farm), ice field, forest land, building lot arid others, in small watersheds, the amount of runoff will be impacted by precipitation. The comparison between the runoff was getting from Kajiyama Formular and calculated runoff from multi-linear regressed equations by land use percentage was performed. Its correlation which was estimated by coefficient of correlation will be accepted or not, as approched 1.00000 values. As the monthly water resources amount is estimated by multi-linear regressed equations, we make a plan to demand and supply the water quantity from small river watersheds during any return periods.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2004년도 학술발표회
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• pp.1223-1227
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• 2004

강수량의 대부분이 여름철에 집중적으로 내리는 우리나라의 경우 경제기반에 필요한 용수 확보를 위한 댐 수위 조절 등의 수자원 관리를 위해서는 강수량의 장기예측이 매우 중요하다. 그러나 장기예측에 앞서 강수량의 기후 특성 분석은 예측을 위한 기반 자료로서 필요하다. 따라서 한반도 기상 관측소 자료로부터 1954년부터 2002년 49년동안 한강과 낙동강 유역의 유역평균 월강수량의 기후특성을 분석하였다. 유역평균 월강수량은 Thiessen 가중법을 사용하여 산출되었으며, 4월 유역평균 강수량은 감소 경향이 뚜렷하고, 8월 유역평균 강수량은 증가 경향이 매우 뚜렷하였다. 또한 두 유역에 있어서 1970년 중반에 유역평균 월강수량의 변동에 변화가 나타났다. NINO3 지수와 한강과 낙동강 유역평균 월강수량 편차와의 동시상관관계에서 유역평균 9월 강수량은 NINO3 지수와 지속적인 음의 상관을 보였고, 11월 유역평균 강수량과는 양의 상관이 크게 나타났다. 우기 동안 한강 유역평균 월강수량의 극한 사상의 종관 특성 분석을 위한 합성도에서 다우해(above normal year)인 경우에는 주로 대륙에 1000 hPa 고도의 음의 편차, 해양에 양의 편차의 중심이 놓여 있어 다우 시기는 북태평양 고기압의 강화와 관련됨을 알 수 있었다. 또한 8월 유역평균 강수량은 한반도 상공의 제트 강화와 관련되어 있었으며, 9월 유역평균 강수량의 경우에는 제트 출구의 북쪽에서의 양의 편차, 남쪽에서의 음의 편차 및 하층 바람장의 수렴과 관련되어 나타났다.

• 한국농공학회논문집
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• 제55권6호
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• pp.177-186
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• 2013

The purpose of this study was to analyze the temporal and spatial characteristics of the stream flow of small rural streams for investigating the status of stream depletion located downstream of irrigation reservoir. Bonghyun and Hai reservoirs and each downstream were selected for this study. Streamflow was measured for 8 stations downstream from two reservoirs from 2010 to 2012. The water quality samples were collected monthly from the 8 stream stations and 2 reservoir stations from 2011 to 2012. The stream depletion was found in most of the downstream of reservoirs for the non-irrigation period and even in the irrigation period when there were a lot of antecedent precipitation. We found that the stream segments where there were few streamflow, vegetation covers the stream and block the streamflow which makes the stream lost its original function as a stream. Water quality monitoring results of Bonghyun stream indicated that the concentration of SS, Turbidity, TOC, COD were decreased as the stream flows from the reservoir to downstream while the TN and TP were increased. The correlation analysis for water quality data indicated that the correlation between T-N and T-P was high for Bonghyeon and Sukji streams, respectively. Continuous monitoring for rural streams located in downstream of reservoirs are required to quantify the status of stream flow depletion and determine the amount of environmental flows.

• 물과 미래
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• 제17권2호
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• pp.72-79
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• 1984

This investagation was carried out by analyzing water types and measuring the environmetal isotopes (tritium and deuterium) for development of water resources and protection of ground waters from sea water intrusion. The water sample were taken monthly from April to June, 1983 from sixteen sites in the Cheju metropolitan area; three sea, three spring, and ten ground waters. The ground water in the midwest area of the city contained 20 TU of tritium and-46 per mille of deuterium, classified as the $NaHCO_3$ type of ground water, generally deep seated. The spring water and ground water in the southern part of the city contained 15 to of tritium and-39 per mile of deuterium, and appeared to the $CaHCO_3$ type of shallow ground water, easily affected 표 precipitation. The results of tritium and deuterium analyses showed that the ground water in the coastal area were not affected by sea water intrusion, although they changed from $NaHCO_3$ or $CaHCO_3$ type to NaCl type in May and June. It is concluded that the high Na and Cl content in those ground waters might come from municipal sewage. The sea water in the Yong-duam area was influenced by sping water.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.679-681
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• 2003

The objectives of this research are as follows. First, to investigate methods for a national-scale land cover map based on multi-temporal classification of MODIS data and multi-spectral classification of Landsat TM data. Second, to investigate methods to p roduce ecological zone maps of Korea based on vegetation, climate, and topographic characteristics. The results of this research can be summarized as follows. First, NDVI and EVI of MODIS can be used to ecological mapping of the country by using monthly phenological characteris tics. Second, it was found that EVI is better than NDVI in terms of atmospheric correction and vegetation mapping of dense forests of the country. Third, several ecological zones of the country can be identified from the VI maps, but exact labeling requires much field works, and sufficient field data and macro-environmental data of the country. Finally, relationship between land cover types and natural environmental factors such as temperature, precipitation, elevation, and slope could be identified.

• 물과 미래
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• 제29권1호
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• pp.221-233
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• 1996

본 연구에서는 가뭄지수를 간단하고, 신뢰성 있고 그리고 쉽게 구할 수 있는 방법을 제안함으로써, 가뭄식 도시지역의 생활용수 및 공업용수의 부족에 대비한 용수수급대책 마련에 이용할 수 있도록 하였다. 가뭄지수 산정은 Phillips 가뭄지수법을 이용하였다. Phillips 가뭄지수법은 월강수량의 초과확률에 근거를 두지만, 실시간 현 가뭄 상황을 파악할 필요가 있을 경우 일강수량자료를 이용할 수 있어 실용성이 아주 컸다. 적용성 검토를 위해 주요 공업지역인 울산시와 포항시의 생활용수 수급체계를 이용하였으며, 그 우수성이 확인되었다. 따라서 본 연구성과는 다른 도시 지역에서의 비상가뭄대책 수립에도 매우 유용한 방법으로 사용될 수 있다.

• 한국토양비료학회지
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• 제42권5호
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• pp.348-354
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• 2009

제주도 지역을 대상으로 기후요인과 토양분포의 관계를 알아보기 위하여 기온, 강우량, 증발산량 등 기후요인을 이용하여 분석하였다. 온도를 기준으로 하여 중심지역의 Mesic상 지역과 주변부의 Thermic상 지역으로 구분하고, 월별 수분수지빈도를 기준으로 4개로 구분하여, 온도, 수분수지로 전체를 온대수분과 다지역(집단1), 난대수분과다지역(집단2), 난대수분균형지역(집단3), 난대수분부족지역(집단4), 난대수분매우부족지역(집단5)의 5개의 집단으로 구분할 수 있었다. 집단1에서 집단5로 갈수록 토양분류측면에서는 andisols, inceptisols, alfisols, ultisols의 분포 비중이, 토색측면에서는 흑색토양, 농암갈색토양, 암갈색토양의 분포비중이 높아지는 경향이었다.

• 한국기후변화학회지
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• 제6권4호
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• pp.283-290
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• 2015

This study was carried out a trend analysis for analyzing change of meteorological elements in the main producing areas of Chinese cabbage, radish, pepper, garlic and onion. As meteorological elements, we selected air temperature (maximum, minimum), precipitation and duration of sunshine. We used monthly data of meteorological elements obtained from the main producing areas of vegetables for 30 years from 1981 to 2010. Mann-Kendall test used for significance test of trend and Sen's estimator of slope for computing the variance of meteorological elements. The study results showed that air temperature tended to increase, but duration of sunshine tended to decrease in most regions.