http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 황한석 (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
-
남정만,이병걸,황한석 제주대학교 해양연구소 1997 해양자원연구소연구보고 Vol.21 No.-
Cheju island formed by volcanic activity which results many distribution of cindercone all over the island. Cindercone is composed of mainly scoria which is called "song-I" in Cheju dialect. The engineering properties of this scoria is completely different from granitic residual soils or sandy soils. Cheju island is being composed of mainly volcanic basalt. because of lack of quartzous sandy materials. Scoria is widely used as road foundation. aggregate for concrete and filler for retaining walls. Therefore scoria is studied on the behaviors of crushability strength. compactability and shearing strength. From this study, the variation of grain size, water content and the influence of shearing strengh due to compaction is observed and correlation of mechanical properties of decomposed granitic soil and scoria is made. The results of compacion test and direct shearing test are as follows (1) Scoria is vesicular perform high permeability accordingly and shows microcrytalline texture with fewer clay minerals while granitic weathered soil has granular texture of which feldspar produce abundant clay minerals by kaolitxation (2) The decompose granitic soils behave increment of density and decrement of optimum moisture content by increasing compaction energy. scoria shows increment of density but no variation in optimum moisture content is observed during the application of compaction energy. This indicates the higher ratio of micro vesicular in scoria. The void ratio after compaction is higher in scoria than decomposed granitic soils. (3) The crushing index is the highest in grain size of 0.1 - 0.5mm in decomposed granitic soil and constant increment of ratio is obseved in scoria. (4) At O.M.C state. the angle of internal fricion is increasing and cohesive index is decreasing due to increment of compaction energy while both angle of internal friction and cohesive index is decreasing due to the increasing simultaneously in scoria. The increment range of shear strength is higher in scoria than decomposed granitic soils. (5) In stress-strain curve this increment range of shearing strength of scoria is larger than granitic soil but the horizontal strain up to failure point is smaller.
-
DRASTIC과 지하수 수질에 의한 창원시 지하수 오염취약성 평가
함세영,정재열,김무진,김인수,황한석,Hamm Se-Yeong,Cheong Jae-Yeol,Kim Moo-Jin,Kim In-Soo,Hwang Han-Seok 대한자원환경지질학회 2004 자원환경지질 Vol.37 No.6
본 연구는 DRASTIC 기법과 지하수 자료를 이용하여 창원시의 공단지역과 주거상업지역의 지하수 오염취약성을 평가하였다. DRASTIC 기법은 원래 오염원이 지표에 있으며 강우의 침투와 함께 오염물질이 지하수로 유입되는 조건에 적용시켰었다. 공단지역은 대체로 주거상업지역보다 높은 DRASTIC 평가지수를 가진다. 그러나, 주거상업지역 중 용지동지역은 연구지역 중에서 가장 낮은 DRASTIC 평가지수를 가짐에도 불구하고 지하수 오염정도가 높다. 이러한 사실은 도시지역의 지하수 오염이 과잉양수와 이에 따른 지하수위 하강과 밀접하게 관련된다는 것을 지시한다. 각 동별 최소 DRASTIC 평가지수와 먹는물 수질 부적합의 상관계수는 0.4로서 비교적 낮다. 그러나, 각 동별 최소 DRASTIC 평가지수와 지하수 사용량의 상관계수는 0.70이고, 각 동별 최소 DRASTIC 평가지수와 지하수 공 분포밀도의 상관계수는 0.87로서 높게 나타난다. 따라서, 도시지역에서 지하수 오염취약성을 평가하기 위해서는 기존의 DRASTIC 평가요소뿐만 아니라 지하수 사용량과 지하수 공 분포 밀도와 같은 인위적인 요소도 함께 고려하는 것이 필요하다. This study assesses groundwater vulnerability to contaminants in industrial and residential/commercial areas of the city of Changwon, using DRASTIC technique and groundwater data. The DRASTIC technique was originally applied to situations in which the contamination sources are at the ground surface, and the contaminants flow into the groundwater with infiltration of rainfall. Mostly the industrial area has higher DRASTIC indices than the residential/commercial area. However, a part of the residential/commercial area having much groundwater production and great drawdown is more contaminated in groundwater than other industrial and the residential/commercial areas even if it has lowest DRASTIC indices in the study area. It indicates that groundwater contamination in urban areas can be closely related to excessive pumping resulting in a lowering of the water level. The correlation coefficient between minimum DRASTIC indices and the degree of poor water quality for 10 districts is as low as 0.40. On the other hand, the correlation coefficients between minimum DRASTIC indices and the groundwater discharge rate, and between minimum DRASTIC indices and well distribution density per unit area are 0.70 and 0.87, respectively. Thus, to evaluate the potential of groundwater contamination in urban areas, it is necessary to consider other human-made factors such as groundwater withdrawal rate and well distribution density per unit area as well as the existing seven DRASTIC factors.
-
-
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
