• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2015년도 학술발표회
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• pp.241-241
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• 2015

In this study, the simulations and analyses of flood flow due to a river inundation in a coastal urban area are carried out using a two-dimensional finite volume method with well-balanced HLLC scheme. The target area is a coastal urban area around Gohyun river which is located at Geoje city in Kyungnam province in Korea and was extremely damaged due to the heavy rainfall during the period of the typhoon "Maemi" in September 2003. For the purpose of the verification of the numerical model applied in this study, the simulated results are compared and analyzed with the inundation traces. Moreover, the flood flow in a urban area is simulated and analyzed based on the scenarios of inflow to the river with the increase and decrease of the intensity of the heavy rainfall.

• 한국조경학회지
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• 제26권2호
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• pp.101-109
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• 1998

Recently, improvement of the quality of urban riverscape environment has been emphasized not only by landscape architectural field but also by various professionals in planning and ecology. Regarding to this current movement, the aim of this paper is to highlight major visual elements of riverscape axis as a case study of Shinchon River in Taegu City to suggest some basic guidelines for arranging riverscape in urban area. The study was mainly based on Repertory Grid Development method which was developed in Japan. The method is consist of three steps such as decision of element landscape in study area for slide photos, selection of evaluation items for interview and obstraction of proper evaluation factors. The major findings through this study are as follows; 1) The 12 major visual elements which possibly improve riverscape, based on abstraction of proper evaluation factors, are Dunchi, surface of the water,, equipment of river, buildings near riverside, river vertical and horizontal facilities like bridge, fine view, riverbed, water plant, naturalness, water's edge line, harmony and street trees by order. 2) Total numbers of adjective which describe 12 common factors are 25, such as clean, open, stable, quiet, comfortable, friendly, bright, natural etc. In addition, Dunchi was described 337 times by various adjectives, surface of the water was 200 times and arrangement of river was 146 times which is similar result with the order of 12 influential common factors. 3) Therefore, Dunchi, surface of the water and equipment of river are three most important factors which could create better riverscape. These three factors implies us how we supply good quality of urban river environment for the urban residents.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.405-408
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• 2008

Up to now, a lot of houses, roads and other urban facilities have been damaged by natural disasters such as flash floods and landslides. It is reported that the size and frequency of disasters are growing greatly due to global warming. In order to mitigate such disaster, flood forecasting and alerting systems have been developed for the Han river, Geum river, Nak-dong river and Young-san river. These systems, however, do not help small municipal departments cope with the threat of flood. In this study, a real-time urban flood forecasting service (U-FFS) is developed for ubiquitous computing city which includes small river basins. A test bed is deployed at Tan-cheon in Gyeonggido to verify U-FFS. It is found that U-FFS can forecast the water level of outlet of river basin and provide real-time data through internet during heavy rain. Furthermore, it is expected that U-FFS presented in this study can be applied to ubiquitous computing city (u-City) and/or other cities which have suffered from flood damage for a long time.

• 한국습지학회지
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• 제11권3호
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• pp.71-80
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• 2009

도시하천은 하천특성이 다양하므로 각 하천별 자연형 하천정비계획을 위한 대안 수립 및 선정방법이 필요하다. 그런데 국내의 자연형 하천복원관련 지침이나 기준에서는 구체적인 방법을 제시하지 않고 있다. 일반적으로 하천복원의 궁극적인 목적은 자연성의 회복에 있으며, 최근에는 친수성 증진을 포함하는 추세이다. 본 연구에서는 자연형 하천정비계획 및 사업의 대안선정에 하천자연도를 사용하였다. 국내실정에 맞도록 개발된 AHP를 이용한 하천자연도법을 사용하고, 유럽의 도시하천복원지침(URBEM, Urban River Basin Enhancement Methods)을 참고하여 자연형 하천정비계획의 대안을 간편하게 비교 선정하는 방법을 제시하였다. 대상하천의 하천자연도 평가항목은 하천의 특성을 고려하여 선택한 후, 복수의 대안을 구성하고 대안별 하천자연도를 산정하여 비교함으로서, 각 대안별 자연성 회복효과 및 하천정비계획 성과를 측정하는 것이 용이하였다. 따라서 하천자연도 평가항목을 평가자가 대상하천의 특성에 맞게 선택하여 대안을 선정하면 자연형하천계획 수립에 효과적인 것으로 판단된다.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.195-198
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• 2008

본 연구는 도심지 유역인 경기도 부천 여월동 단지 내의 도시하천에 대해서 유출 및 홍수 특성을 분석하였다. 해당 유역의 하천은 평상시에는 매우 적은 유량만이 흐르고 있으나, 홍수 시에는 상대적으로 높은 홍수위 및 유속으로 인해 홍수 피해의 위험성을 안고 있다. 홍수에 대한 안전성을 확인하기 위하여 유출 해석 모형을 적용하고, 또한 해당 유역에 대해 구축된 GIS 자료 및 하천 단면과 HEC-RAS를 이용, 홍수위를 예측하여 치수 안정성을 검증하고, 홍수시의 유속을 산정하여 하천 시설물과 자연형 호안 공법에 대한 홍수 방어 능력을 검토 하였다. 검토 결과 다목적 소하천을 목적으로 설치된 하천 구조물로 인하여 홍수 피해 발생위험이 있었으며, 홍수시에도 높은 유속으로 인한 불안요소를 포함하고 있었다. 이러한 주거지역내 소규모의 도시 하천에 대한 홍수 유출 해석에서는 홍수 유출 외에도 구조물에 의한 배수위 변동과 홍수시 유속으로 인한 영향과 같은 여러 위험 요인에 대하여 함께 고려해야 할 것으로 판단된다.

• 한국환경과학회지
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• 제18권1호
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• pp.113-127
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• 2009

This study was designed to present a river model with an aim at restoring the ecosystem and improving the landscape along the urban rivers on the basin of the Namhan river, a core life channel for the National Capital region. The revelation of botanical status, transition trend and correlation of plants might lead to providing the urban river restoration projects and ecological river formation projects with basic data for a model of ideal aquatic ecology and landscape. The outcomes of this study could be summed up as follows: 1. Communities of Juglans mandshurica, Cornus controversa and Fraxinus mandshurica constitute the main portion of flora at or around uppermost branch streams of the River Namhanis harbored mainly in and around small brooks 2. Typical terrestrial forest communities formed around the River Namhan are composed mainly of Larix leptolepis, Pinus rigida, planned forestation of Pinus koraiensis, Quercus acutissima, Quercus variabilis and Pinus densiflora. 3. The analysis into terrestrial environment of plant communities showed a high content of $P_2O_5$, typical communities found in the artificially disturbed land Finally, it seems also desirable to continue to make every exertion to explore the relationship between fluvial and terrestrial ecologies with a purport of building up a model of natural streams in urban area based on the surveyed factors for plant life, forest communities, soil and landscape and, moreover, on the forecasting for overall influences derived from the relation upon the ecosystem.

• 한국물환경학회지
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• 제34권5호
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• pp.487-493
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• 2018

Urban stormwater runoff is the one of the most extensive causes of deterioration of water quality in streams in urban areas. Especially, in the Suyeong River watershed, non-point sources from urban-residential areas are the most common cause of water pollution. Also, it has been ascertained that BOD and COD as indexes of organic matter, have limitation on management of Suyeong River's water quality. In this study, changes of organic matter properties of Suyeong River from inflow of non-point source during rainfall were investigated. Fractions of organic matters were analyzed using water samples collected at two sites (Suyeong River and Oncheon Stream) during a rain event. Variations of dissolved organic carbon (DOC) concentration by rainfall were similar to flow rate change in the river. Distribution of organic matter fraction according to change of rain duration revealed that while hydrophilic component increased at initial rainfall, the hydrophobic component was similar to change in dissolved organic carbon (DOC) concentration. Also, the relative proportion of hydrophilic components in organic matter in river water increased, due to rainfall. Results of biodegradation of organic matters revealed that decomposition rate of organic matters during rainfall was higher than that of during a non-rainfall event.

• 한국환경과학회지
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• 제5권3호
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• pp.377-385
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• 1996

This study aims at the estimation of a river management flow in urban basin analyzing Sinchun basin to be the tributary of Kumho river basin. The river management flow has to satisfy a low flow as natural flow and an environmental preservation flow estimated by a dilution flow to satisfy a target water quality in drought flow. Therefore for the estimation of a river management flow in Sinchun in this study, first Tank model as a basin runoff model estimates a low flow, a drought flow from a flow duration curve in Sinchun, second QUAL2E model as water quality model simulates water quality in Sinchun and estimates environmental preservation flow to satisfy a target water qua%its, BOD 8 mg/l by a dilution flow derived from Kumho river, Nakdong river and around water. And the river management flow is estimated by addition of a use flow and a loss flow to more flow between a low-flow and an environmental preservation flow.

• 융합정보논문지
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• 제11권12호
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• pp.115-126
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• 2021

본 연구에서는 내외수 범람을 동시에 고려하여 침수해석을 수행하는 시뮬레이션 모형을 개발하였다. 외수 침수해석을 위해 제방 월류 및 파제에 의한 하천범람 유입량을 고려할 수 있도록 하였고, 내수 침수해석을 위해서 이중배수체계 개념을 반영하도록 구성하였다. 지표면 침수해석과 관련하여 하천의 유동해석과 제내지의 유동해석을 통합적으로 수행하기 위해 유한요소법(FEM)을 적용하여 침수확산 해석을 수행할 수 있도록 하였다. 모형의 검증을 위해 우선 개념모델에 대해서 적용하였고, 이어서 실제 유역에 대해서 적용하였다. 본 연구를 통해 홍수로 인한 피해를 줄이고 홍수 피해를 저감하기 위한 효과적인 대책을 마련하기 위해 활용될 수 있을 것으로 기대된다.

• 산경연구논집
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• 제10권1호
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• pp.9-17
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• 2019

Purpose - Urban agglomeration construction is one of national strategic plans to accelerate the development of industrialization and urbanization in China, which has threatened the eco-environmental quality at the same time. This paper selected the urban agglomeration in the middle reaches of the Yangtze River as the research area. Research design, data, and methodology - The the slack-based measurement (SBM) model considering undesirable outputs is applied to measure the eco-efficiency of this urban agglomerations during 2006-2015. Results - The empirical results show that average eco-efficiency of the urban agglomeration in the middle reaches of the Yangtze River is 0.595. Regional ecological development is unbalanced. The highest eco-efficiency is recorded at Wuhan Metropolitan Area, and the lowest one is at the Changsha-Zhuzhou-Xiangtan City Group. Energy consumption and waste dust emissions are the key factors led to ecological inefficiency. Based on this, potentials for energy saving and waste dust reducing are calculated. Conclusions - Finally, this study provides policy implications targeted to promote the coordinating development of economy and eco-environment under the construction of urban agglomeration.