본 연구에서는 우수유출저감시설 중 침투형 집수정의 효과를 규명하기 위하여 성남, 오산, 청주지역에 설치된 시범시설에서 실시간으로 현장계측을 수행하고 이들 자료를 분석하여 그 효과를 정량화하였다. 현장 강우자료와 수위 자료를 토대로 자 지점에 설치된 일반집수정과 침투집수정에서의 강우량에 따른 유출량을 비교하여 유출저감율과 첨두유량저감율을 총강우량, 평균10분강우강도, 최대10분강우강도에 따라서 각각 비교 분석하였다. 각 지점의 현장자료를 통하여 침투집수정

유출에 대한 신속하고 정확한 예측은 수문 및 수자원 분야에 있어서 궁극적인 목표 중의 하나이며, 우리나라와 같이 강우에 대한 유출의 응답이 짧은 시간에 발생하는 경우에 무엇보다도 중요하다. 따라서, 토지이용변화 등에 의한 유출의 변화 및 감시를 포함하는 유역내의 수문 변수의 변화를 적절하게 고려할 수 있는 분포형 자료를 선호하게 된다. 이때 분포형 모형을 적용시키기 위해서는 강우의 공간특성을 알아야 하며, 각 격자별 강우량이 입력자료로 활용되어 각 격자

We would like to investigate the strong wind phenomenon effecting to the onset of a sea breeze. It is general the fact that the onset time of a sea breeze is mainly affected according to the distance from the coastline but we find the reversal fact. The onset time at Suyoung is faster than that at Haeundae in spite of the observation site of Suyoung is 5 m and that of Haeundae is 1 km away from the coastline. This is the reason that the nighttime air is converged the lower area by surface cooling and then it is strongly drained onto the lowest area, Suyoung river until the sunrise. it is proved by observation data at Suyoung and Haeundae.

삽교호유역에 위치한 19개 수질관측지점에서 측정된 월별수질자료를 이용하여 수질관측지점을 2개에서 7개의 수질특성으로 분류하였으며, 그에 따른 수질요인분석을 실시하였다. 군집분석결과 삽교호유역의 각 하천은 개개의 수질특성을 보이고 있으며, 삽교호, 삽효천, 무한천 및 곡교천의 4개 그룹으로 나눌 수가 있었다. 수질분석결과에 의하면 삽교호에서는 부유물질의 농도가 다른 하천보다 높았는데 이는 하천으로부터 유입되는 풍부한 영양염에 의한 식물플랑크톤의 생물량 증

Variations in phytoplankton concentrations result from changes of the ocean color caused by phytoplankton pigments. Thus, ocean spectral reflectance for low chlorophyll waters are blue and high chlorophyll waters tend to have green reflectance. In the Korea region, clear waters and the open sea in the Kuroshio regions of the East China Sea have low chlorophyll. As one moves even closer to the northwestern part of the East China Sea, the situation becomes much more optically complicated, with contributions not only from higher concentrations of phytoplankton, but also from sediments and dissolved materials from terrestrial and sea bottom sources. The color often approaches yellow-brown in the turbidity waters (Case Ⅱ waters). To verify satellite ocean color retrievals, or to develop new algorithms for complex case Ⅱ regions requires ship-based studies. In this study, we compared the chlorophyll retrievals from NASA's SeaWiFS sensor with chlorophyll values determined with standard fluorometric methods during two cruises on Korean NFRDI ships. For the SeaWiFS data, we used the standard NASA SeaWiFS algorithm to estimate the chlorophyll a distribution around the Korean waters using Orbview/ SeaWiFS satellite data acquired by our HPRT station at NFRDI. We studied to find out the relationship between the measured chlorophyll a from the ship and the estimated chlorophyll a from the SeaWiFS satellite data around the northern part of the East China Sea, in February, and May, 2000. The relationship between the measured chlorophyll_a and the SeaWiFS chlorophyll_a shows following the equations (1) in the northern part of the East China Sea. Chlorophyll_a=0.121Ln(X) + 0.504, R2 = 0.73 (1) We also determined total suspended sediment mass (SS) and compared it with SeaWiFS spectral band ratio. A suspended solid algorithm was composed of in-situ data and the ratio (LWN(490 nm)/LWN(555 nm)) of the SeaWiFS wavelength bands. The relationship between the measured suspended solid and the SeaWiFS band ratio shows following the equation (2) in the northern part of the East China Sea. SS=-0.703 Ln(X) + 2.237, R2 = 0.62 (2) In the near future, NFRDI will develop algorithms for quantifying the ocean color properties around the Korean waters, with the data from regular ocean observations using its own research vessels and from three satellites, KOMPSAT/OSMI, Terra/MODIS and Orbview/SeaWiFS.

Satellite data, with sea surface temperature(SST) by NOAA and sea level(SL) by Topex/poseidon, are used to estimate characteristics on the variations and correlations of SST and SL in the East Asian Seas from January 1993 through May 1998. We found that there are two climatic characteristics in the East Asian seas: the oceanic climate, the eastern sea of Japan, and the continental climate, the eastern sea of China, respectively. In the oceanic climate, the variations of SL have the high values in the main current of Kuroshio and the variations of SST have not the remarkable seasonal variations because of the continuos compensation of warm current by Kuroshio. In the continental climate, SL has high variations in the estuaries(the Yellow River, the Yangtze River) with the mixing the fresh water and the saline water in the coasts of continent and SST has highly the seasonal variations due to the climatic effect of continents. In the steric variations of summer, the eastern sea of Japan, the East China Sea and the western sea of Korea is increased the sea level about 10∼20㎝. But the Bohai bay in China have relatively the high values about 20∼30㎝ due to the continental climate. Generally the trends of SST and SL increased during all periods. That is say, the slopes of SST and SL is presented 0.29℃/year and 0.84㎝/year, respectively. The annual and semi-annual amplitudes have a remarkable variations in the western sea of Korea and the eastern sea of Japan. In the case of the annual peaks, there appeared mainly in the western sea of Korea and the eastern sea of Japan because of the remarkable variations of SL associated with Kuroshio. But in the case of the semi-annual peaks, there appeared in the eastern sea of Japan by the influence of current, and in the western sea of Korea by the influence of seasonal temperature, respectively. From our results, it should be believed that SST and SL gradually increase in the East Asian seas concerning to the global warming. So that, it should be requested to the international co-operation against to the change of the abnormal climate.

침식률 측정장치인 SEDFLYME을 사용하여 직접 측정한 침식률 자료를 이용하는 퇴적물 수송에 관한 2차원 모형이 개발되었다. 개발된 모형은 현장 적용성을 높이기 위하여 경계밀착좌표계를 수평방향에 대해 사용하며, 퇴적물 이동 모의시 침식률 산정에서 불확실성을 줄이기 위해 침식률 측정자료를 직접 사용한다. 개발된 모형은 부유사와 소유사 이동을 모두 고려한다. 모형의 정확성을 검토하기 위하여 1차원 수로에서 장갑화 현상을 모의하고 실험자료와 비교하였다. 비

실험 또는 계측에 의해 관측된 관측치들은 종종 어떤 기준치 이하의 작은 값들이 기록되는데, 이들 기준치 이하의 값들이 크기는 미소할지라도 평균이나 분산 추정시 왜곡된 결과를 줄 수 있다. 그러나 우리 나라에서는 관측오차로 간주하여 N.D.(Not Detected)로 처리하는 것을 관례로 하고 있어 미소치들이 기록되지 않고 있다. EK라서 본 연구에서는 부여 취수장의 암모니아성 질소(NH-N)자료가 크기에 따라 분표형이 다름을 조사하고 그 분포를 구별할