• 한국농공학회지
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• 제38권5호
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• pp.55-63
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• 1996

The situation and cause of bund collapse in steep sloping paddy area by a heavy rainfall of Chungbuk Province were investigated by field surveys. Shapes of paddy plots are irregular and average size of them is 12.6a. Surface, groundwater and plot-to-plot irrigations are being carried out in the study plots. The type of bund collapse can be divided as follows: overflow type and inundation type. The overflow type generally occurs at the bund with slope lacking the design standard. The inundation type damages paddy plots more seriously than the overflow type. It induces continuous bund collapse from a inflow-plot to a outflow-plot and includes lots of type (inside paddy) collapse, which results in much subsoil erosion. The installation of mountain stream weir and maintenance of mountain stream are proposed to prevent the inundation type collapse.

• Ecology and Resilient Infrastructure
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• 제2권2호
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• pp.118-127
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• 2015

하천은 구간에 따라 하도의 지형학적인 특성이 다양하기 때문에 수리 및 하도 특성 평가를 위해서는 하천의 유형을 분류할 필요가 있다. 또한 하도 특성에 대한 정량적 평가체계는 하천 유형의 특성이 반영되어야 한다. 따라서, 본 연구에서는 하천분류체계의 한국 하천에 대한 적용성을 검토하기 위하여 Rosgen의 하천분류체계와 Yamamoto의 하천분류체계를 비교, 분석하였고, 남강을 사례로 그 적용성을 검토하였다. 하천 지형학적인 측면에서 우리나라의 지방 및 국가하천의 평균하상경사와 종적 연속성을 고려하기 위해서는 하천 지형학적인 측면에서 Yamamoto의 하천분류체계가 적용성이 높은 것으로 판단된다. 또한, 하상재료의 측면에서 Rosgen 분류체계가 Yamamoto의 분류체계보다는 하상경사와의 상관성이 낮게 나타났다. 반면에 Yamamoto의 분류체계는 하상경사에 따른 토사분급 (수리분급)을 반영할 수 있는 것으로 확인되었다. 남강에 대하여 얻어진 결과에 의하면, Rosgen의 분류체계로서는 하상경사와 하상재료의 관계로서 하천유형을 분류할 수 없으나, Yamamoto 분류체계는 그 상관성을 입증할 수 있었다. 다만, 자연하천에 대하여 추가적인 적용성 검토가 필요하다. 하도 특성 평가체계에 적용할 수 있는 3개의 하천유형을 결정하여 제시하였다.

• 한국조경학회지
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• 제27권4호
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• pp.39-49
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• 1999

Urban streams have, recently, been straightened and widened to alleviate flooding problem. As a result, the stream have been modified inadvertently for ecological functions and microtopography. In this study, we investigated riparian vegetation and microtopography of the tributaries of Han River before and after the monsoon rain in summer. The purpose of this study was to relate the stream microtopography to the distribution of riparian vegetation. The stream microtopography was investigated for its scale and pattern. Vegetation was investigated from 131 plots by Braun-Blanquet method. The distribution of riparian vegetation was significantly correlated with the stream microtopography. Various herbaceous species occurred at stream bank slop, high terrace and channel side. However, at channel side and concave part of terrace where soils were in high moisture level, only a few wetland species were dominated. The complexity of the microtopography in the stream corridors led to heterogeneous riparian vegetation. The vegetation showed more stability against flooding at the stream corridors with natural and complex microtopography than at the urban-type stream corridors with simple topographical features. The results showed that the development of riparian vegetation was influenced by the changes in microtopography, which was primarily determined by the shape and characteristics of channel. It seemed that a close-to-nature river system would be restored more readily with an understanding of microtopographical features affecting the distribution of riparian vegetation.

• 자원환경지질
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• 제31권2호
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• pp.101-110
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• 1998

The purpose of this study is to elucidate the source of U anormaly formed in stream water of the drainage system around the Shinbo talc mine area based on the hydrochemical properties of water masses including surface water and groundwater. The hydrochemical properties of water masses in the Shinbo talc mine area are divide into three types; Type I : $Ca(Mg)SO_4$ type with high U content as shown in the stream water flowout from the mine, Type II : $Ca(HCO_3)_2$ type with high U content as in deep groundwater, Type III : $Ca(HCO_3)_2$, type with low U content as in the other stream water and shallow groundwater. It is necessary to emphasize that in deducing the uranium source, a distinct discrimination between type I and type II is showed in their hydrothermal properties in spite of commonly having a high uranium content, which in turn means the occurrence of a different water-rock interaction processes between both type. All evidences suggest that type II groundwater have acted as a primary media in the transport of uranium and that, as the groundwater flows through the talc mineralization zone, water composition of type II was transformed into that of type I water as the results of a secondary water rock interaction process, caused by imposition of new mineralogically controlled thermodynamic constraints. Consequently, in the viewpoint of hydrochemical exploration, the investigation of the hydrologic circulation system and the hydrogeologic properties for the aquifer of type II groundwater shall be done first of all and will provide a crucial clue on tracing the uranium mineralization zone occurred in the Shinbo talc mine area.

• 한국지리정보학회지
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• 제14권4호
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• pp.77-91
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• 2011

본 연구에서는 안성천 유역의 중소하천에 Rosgen(1994)의 하천분류체계를 적용하여 하천을 분류하고, 분류된 하천 유형별로 2차원 수리해석 모형을 이용하여 수리특성 및 하상변동을 모의하였다. 하천분류체계를 안성천 유역의 진위천과 오산천에 적용한 결과 크게 C 유형과 E 유형으로 분류되었다. 분류된 유형의 2차원 수리모형 적용에 따른 수리특성 및 하상변동 분석을 위해 C 유형의 구간 중 진위천과 통삼천의 만곡구간, 공세천, E 유형중 수원천을 연구대상지역으로 선정하였다. 하천분류체계에 의해 선정한 연구대상지역에 대하여 CCHE2D 모형을 이용한 빈도별 홍수량에 따른 하상변동 수치모의를 수행하였다. 모형의 경계입력자료는 WMS HEC-1의 유출량 결과 자료를 이용하여 50, 80, 100년 빈도별 홍수량에 대하여 모의하였다. 모의 결과 비교적 하폭/수심비가 큰 C 유형의 경우 하천의 물리적 특성의 변화에 따른 하상변동의 침식 및 퇴적의 경향이 잘 나타난 것으로 분석 되었고, C 유형에 비해 작은 E 유형의 경우 변화에 따른 하상변동의 경향을 파악 할 수 없었다. 본 연구의 결과는 하천의 물리적 변화에 따른 흐름 및 하상변동을 예측하는 방법에 기초자료를 제공할 수 있을 것으로 판단된다.

• 한국환경복원기술학회지
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• 제8권3호
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• pp.43-52
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• 2005

Evaluations of the fish farm influences on stream water quality may provide basic informations on watershed management to reduce environmental impact due to fish farm development and to conserve stream water quality in forested watershed area. In this research influent, effluent water in the fish farm and stream water qualities around Mt. Baegun area were monitored seasonally for six years and the following results were obtained. Due to the increase of pH in effluent water from the fish farm it was believed that alkalization of stream water can be accelerated by large scale development of fish farms in the forested watershed area. Also, effluent water from the fish farm increase of EC higher than influent and stream water. As a result of regression analyses, pH, EC, DO, water temperature, total amount of cation and anion in influent and effluent water of fish farm show high significance.

• 한국공간정보시스템학회 논문지
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• 제11권2호
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• pp.162-169
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• 2009

The real-time traffic data is generated continuous and unbounded stream data type while intelligent transport system (ITS) needs to provide various and high quality services by combining with spatial information. Traditional database techniques in ITS has shortage for processing dynamic real-time stream data and static spatial data simultaneously. In this paper, we design and implement an advanced traffic monitoring system (ATMS) with the integration of existed data stream management system (DSMS) and spatial DBMS using IntraMap. Besides, the developed ATMS can deal with the stream data of DSMS, the trajectory data of relational DBMS, and the spatial data of SDBMS concurrently. The implemented ATMS supports historical and one time query, continuous query and combined query. Application programmer can develop various intelligent services such as moving trajectory tracking, k-nearest neighbor (KNN) query and dynamic intelligent navigation by using components of the ATMS.

• 정보처리학회논문지D
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• 제16D권5호
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• pp.673-682
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• 2009

웹상에서 데이터 교환과 표현을 위한 표준으로 XML 데이터가 널리 사용되고 있으며 유비쿼터스 환경에서 XML 데이터의 형태는 연속적이다. 이와 관련하여 XML 스트림 데이터에 대한 빈발 구조 추출 및 효율적인 질의처리를 위한 마이닝 방법들이 연구되고 있다. 이 논문에서는 슬라이딩 윈도우 기반으로 하여 XML 스트림 데이터로부터 최근 윈도우 범위에 속하는 데이터에 대한 빈발 패턴 구조를 추출하기 위한 마이닝방법을 제안한다. 제안된 방법은 XML 스트림 데이터를 트리집합 모델, XFP_tree로 표현하고 이를 이용하여 최근의 데이터에 대한 빈발구조 패턴을 빠르게 추출한다.

• Nuclear Engineering and Technology
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• 제16권1호
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• pp.21-28
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• 1984

수치확산을 포함한 truncation오차의 줄임은 수치해석의 중요한 과제가 되어왔다. Stream line방법이 교차수치 확산과 비확산형의 truncation 오차를 제거하기 위하여 고안되었다. 또한, stream line방법과 유한 차분법이 합쳐진 2단계 stream line방법이 비압축성 난류유동의 지배 방정식을 풀기 위하여 고안되었다. 이 방법은 유한 차분법과 비교되었으며, 두 방법 모두 실험자료와 비교되었다. 그리고, 두 방법의 truncation 오차를 비교하기 위하여 truncation 오차 분석이 행해졌다

• 한국환경보건학회지
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• 제23권4호
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• pp.1-8
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• 1997

The aquatic animals of Tan stream were composed of 46 species, 28 families, 11 orders, 6 classes in 4 phyla during the survey period of April, 1996 to December, 1996. They were composed of 31 species in aquatic insecta, 6 species in annelida, 3 species in mollusca, 1 species in crustacea, and 5 species in fishes, respectively. Major dominant species in Tan stream were Chironomidae sp.1, Chironomidae sp.2, Chironomidae sp.3, Tubufucidae sp.1, Physa acuta and hirudo niponica. Dominance indices of benthic macroinvertebrates ranged highly from 95.74 to 100.00% at lower stream(site 4), but ranged 50.00 to 95.85% at site 1 through site 3. The aquatic animals ranged from 25 to 32 species at site 1 through site 3, but they were only 3 species at site 4 for survey period. Tan stream in the light of urban stream ecosystem has a little less riffle areas and hydrophyte areas by cementation of riparian area and channel type of water course. Therefore, the species of aquatic animals in Tan stream decreased because of deterioration of water quality according to reduction of self-purifcation ability and loss of microhabitat according to reduction of hydrophyte areas and riparian areas. The tendency of decreasing species of aquatic animals appeared seriously at lower stream From drive licence test authority at Kangnam-ku, Seoul to conjunction point of the Han river.