• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2015년도 학술발표회
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• pp.106-106
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• 2015

The information of flow regimes continues to be norm in water resource and watershed management, in that stream flow regime is a crucial factor influencing water quality, geomorphology, and the community structure of stream biota. The objectives of this study were to estimate Korean stream flows from landscape variables, classify stream flow gages using hydraulic characteristics, and then apply these methods to ungaged biological monitoring sites for effective ecological assessment. Here I used a linear modeling approach (MLR, PCA, and PCR) to describe and predict seasonal flow statistics from landscape variables. MLR models were successfully built for a range of exceedance discharges and time frames (annual, January, May, July, and October), and these models explained a high degree of the observed variation with r squares ranging from 0.555 (Q95 in January) to 0.899 (Q05 in July). In validation testing, predicted and observed exceedance discharges were all significantly correlated (p<0.01) and for most models no significant difference was found between predicted and observed values (Paired samples T-test; p>0.05). I classified Korean stream flow regimes with respect to hydraulic and hydrologic regime into four categories: flashier and higher-powered (F-HP), flashier and lower-powered (F-LP), more stable and higher-powered (S-HP), and more stable and lower-powered (S-LP). These four categories of Korean streams were related to with the characteristics of environmental variables, such as catchment size, site slope, stream order, and land use patterns. I then applied the models at 684 ungaged biological sampling sites used in the National Aquatic Ecological Monitoring Program in order to classify them with respect to basic hydrologic characteristics and similarity to the government's array of hydrologic gauging stations. Flashier-lower powered sites appeared to be relatively over-represented and more stable-higher powered sites under-represented in the bioassessment data sets.

• 생태와환경
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• 제53권4호
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• pp.390-407
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• 2020

This study was carried out to evaluate the restoration effect in the restored Yangjae stream and to draw up an adaptive management plan based on the results. As the result of evaluation on the restoration effect, the restored Yangjae stream was evaluated with low naturalness in both terms of the morphology of the stream and the composition and spatial distribution of vegetation. The diverse functional groups were introduced in the vegetation restoration, but the flooding regime, which is significant in the spatial distribution of riparian vegetation, were not correctly reflected. Exotic species or species that were not ecologically suitable for the location were introduced on the embankment and thus a measure to improve those problems is required. As the ecological principle was not reflected in the restoration plan, the stream was constructed as the double terrace structure. Therefore, the width of the waterway was narrowed further, and the waterfront was not designed to accommodate changes from flooding disturbance, making the micro-topography of the stream simpler and the naturalness lower. The adaptive management plan was prepared to improve those problems, and a plan for creating an ecological network was recommended to enhance the restoration effect.

• 한국환경생태학회지
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• 제22권4호
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• pp.420-426
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• 2008

본 연구는 무심천의 상류부터 하류까지 총 9개 지점을 선정하여 수서곤충의 EPT-group을 이용하여 EPT-비율, EPT 풍부도, EPT 종수와 개체수를 지점별로 비교분석하였고 수서곤충의 종 조성에 따른 UPGMA분석으로 조사지점간의 유사도를 비교하였으며 수서곤충의 섭식기능군은 하천차수에 의해 비교분석하였다. 조사결과에 의하면 무심천의 수서곤충은 총 8목 36과 71종으로 조사되었고 EPT 비율과 EPT 풍부도는 지점 3에서 각각 0.72, 3.89로 다른 지점에 비해 다소 높게 나타났으며 이와 반대로 지점 9에서는 0.03, 0.09로 비교적 낮게 나타났다. 또한 EPT 종수 및 개체수는 지점 9에서 가장 낮게 나타났다. UPGMA분석 결과 무심천의 각 지점은 A1(st. 1, 7, 8), A2(st. 2, 3, 4, 5, 6), B(st. 9)로 3개의 그룹으로 나뉘었으며 섭식기능군은 지점별 차이는 나타나지 않았지만 상.중류역에서는 써는무리와 긁어먹는 무리가 다른 지점에 비해 다소 높게 나타난 반면 하류에서는 걸러먹는무리와 줍는무리가 우세한 것으로 확인되었다. 본 연구 의하면 조사지점에 따라 수서곤충의 EPT-richness, EPT-ratio, EPT 수 뿐만 아니라 섭식기능군의 조성에도 영향을 주는 것으로 나타났다.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2007년도 정기총회 및 학술발표대회
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• pp.509-512
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• 2007

The fire area need management to prevent enlargement of collapes and sinkage. and it need that repair Vegetation sack work, Soil arresting structure, Terrace-sodding works, Direct seeding works in greening works and Water cushion in erosion control dam. The whole of the Concrete stream grade stabilization structures were broken, it need to be repair. As pass the time, a lot of structures were abandoned. Therefore, it need to reorganize erosion control structures and the method of construction in the fire area

• 한국환경생태학회지
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• 제23권5호
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• pp.381-391
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• 2009

전라북도 전주시의 전주천에서 2000년 4월부터 2002년 12월까지 상류인 한벽교부터 삼천 합류지점까지 도심을 관통하는 7.2km의 구간에서 "자연형하천 조성사업" 이루어졌으며, 이에 대한 전주천의 자연형 하천 조성 사업 전과 후의 어류상 및 군집을 조사하였다. 조사 결과 조성사업 이전인 1975년부터 1999년까지 전주천에서는 12종~8종의 어류가 출현하였으나, 공사 이후인 2003년~2008년 사이에는 총 34종이 확인되어 어류의 다양성이 크게 향상되었다. 특히 도심지인 중류지점 (다가교-서신교사이)에서는 공사이전에는 5종의 적은 종이 출현하였으나 공사 이후에는 22종으로 급증하는 특징을 보였다. 이러한 어류상의 변화는 자연형 하천 공사로 인해 생활하수의 유입 차단으로 인한 전주천의 수질개선 및 직강화 되고, 평탄화 되어 있던 하천에서 여울과 소가 반복적으로 나타났으며, 또한 하상구조도 돌과 자갈, 모래, 진흙 등으로 다양화되어 어류의 서식공간이 다양화되었기 때문으로 생각된다.

• 생태와환경
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• 제42권4호
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• pp.422-431
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• 2009

This study was to provide basic data for aquatic ecosystem research using fishes. Field sampling was carried out at five selected sites of Gap Stream, and fish samples, especially for a selection of sentinel species were collected three times in June, September, and October 2007. We analyzed total length distribution of Zacco platypus in relation with the season and the sampling sites, and then compared with total body weight, condition factor (K), and age distribution of the fish. The fish population data were compared with physico-chemical water quality, obtained from the Ministry of Environment, Korea. Water quality analysis showed a significant nutrient enrichment, based on total nitrogen (TN) and total phosphorus (TP), and organic matter pollution, based on biological oxygen demand (BOD) and chemical oxygen demand (COD) in the Site 5, which is directly influenced by wastewater disposal plant (WDP). Population analysis of the sentinel species showed that the total number of individuals, age distribution, and the population size-structure were influenced by the effluents from the WDP, and that reproductive failure of young-age population were evident in Site 5. According to the relation analysis of total weight to K, the disturbed population was mainly attributed to combined effects of habitat modifications and chemical degradations. Regression analysis of K values against water quality parameters showed significant (p<0.05) positive relations with nutrient and organic matter contents. Our data suggest that the population structure using a sentinel fish species reflected the ambient water quality in the stream and that diagnosis of aquatic ecosystem health using Z. platypus population may be practical for water resource and ecosystem conservations.

• 한국어류학회지
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• 제21권1호
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• pp.47-54
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• 2009

본 연구는 2007년 7월부터 2008년 6월까지 왕피천 8개 주요지점을 중심으로 어류상과 군집구조를 분석하였다. 그 결과 왕피천 일대의 어류는 9과 20속 23종이 확인되었다. 한국고유종은 점몰개, 돌마자, 미유기, 자가사리, 꺽지, 동사리, 참갈겨니, 기름종개 8종이 나타났다. 과별 어종구성을 보면 잉어과가 11종으로 가장 많았으며 그 외 망둑어과에서 3종, 미꾸리과, 메기과에서 2종, 바다빙어과, 퉁가리과, 연어과, 꺽지과, 동사리과가 각각 1종씩 출현하였다. 우점종은 참갈겨니, 아우점종은 돌고기로 나타났으며 산천어, 미유기. 메기 등은 2001년 이후 처음 확인된 종이다. 왕피천은 어종의 구성과 생물지수, 하천의 구조가 중-하류에서도 상류와 유사한 특성을 보여주고 있었다.

• 한국통신학회:학술대회논문집
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• 한국통신학회 2006년도 하계종합학술발표회 논문 초록집
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• pp.600-600
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• 2006

• Water Engineering Research
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• 제6권4호
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• pp.161-168
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• 2005

With characteristics of river continuum, stream ecosystems have diverse components and environments from upstream channel to estuarine area. Therefore, the habitat requirements and composition of conservative object should be well understood before applying any improvement measure. In this paper, the causes of stream habitat changes were first illustrated with the categories and principles of habitat restoration methods. The structural restoration techniques of fish habitat improvement utilized by the authors or one three-year research project starting at 1990 were then presented. Through the introductions on the project background, planning guidelines, structure design, and ecological evaluation, this paper tried to provide some effective examples of stream restoration practices that ecological expert was invited for cooperation and advising.

• Journal of Information Processing Systems
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• 제6권1호
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• pp.79-90
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• 2010

A data stream is a massive unbounded sequence of data elements continuously generated at a rapid rate. The continuous characteristic of streaming data necessitates the use of algorithms that require only one scan over the stream for knowledge discovery. Data mining over data streams should support the flexible trade-off between processing time and mining accuracy. In many application areas, mining frequent itemsets has been suggested to find important frequent itemsets by considering the weight of itemsets. In this paper, we present an efficient algorithm WSFI (Weighted Support Frequent Itemsets)-Mine with normalized weight over data streams. Moreover, we propose a novel tree structure, called the Weighted Support FP-Tree (WSFP-Tree), that stores compressed crucial information about frequent itemsets. Empirical results show that our algorithm outperforms comparative algorithms under the windowed streaming model.