• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.494-494
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• 2018

최근 하천에서 홍수방지를 위한 제방과 댐 같은 구조물이 지속적으로 건설되고 있으며 이러한 구조물의 설치는 자연적인 하천의 발달과정을 느리게 하고 어류의 서식처를 감소시킨다. 특히 주기적인 홍수 및 홍수터를 필요로 하는 어류는 유량의 규제 및 홍수터의 감소로 심각한 영향을 받게 되었고, 많은 종류의 어류가 환경 및 생태계의 변화로 멸종했다. 따라서 수중생태계에서 어류의 서식환경을 보호하고 유지하기 위해서는 공간확대를 통한 적절한 서식처가 보장되어야 한다. 본 연구에서는 공간복원 시나리오에 따른 수환경 변화가 어류 물리서식처에 미치는 영향을 분석하기 위해 2차원 물리서식처 모형인 River2D를 적용하였다. 만경강 유역의 봉동, 소양, 하리 3개의 지점을 경계지점으로 하여 대상영역 내 저지대 상습 침수구역인 만경강 본류와 소양천 합류지점을 복원대상지로 선정 후, 현재하도와 세가지 복원 시나리오(제방 셋백, 구하도, 배후습지)를 적용하여 분석을 실시하였다. 이 분석에서 모니터링 된 과거 흐름과 세가지 물리적 복원 시나리오 뿐만 아니라 필요한 유량조건의 범위에 있는 목표종 성장단계는 홍수터 서식지 이점에 영향을 미친다. 분석결과 홍수터 지역의 물리적 복원을 통해 대상어종의 생태계 복원 전의 부정적인 영향을 줄일 수 있었고 특히 WUA 분석에 따르면 세가지 복원 시나리오 적용시 복원전보다 서식처 개선효과가 크게 나타나는 것을 확인할 수 있었다. 구하도 복원의 경우 WUA 값은 산란기에 20.0%, 성장기에 39.5%로 가장 큰 효과를 나타냈고, 그 결과와는 다르게 배후습지 복원의 경우 성어기에 85.3%로 가장 크게 나타났다. 또한 동일한 흐름에서 홍수터의 확보 및 복원을 통해 최소유량에서 최대서식처 개선효과를 얻을 수 있음을 확인하였다. 최종적으로 복원이 성공적으로 이루어지기 위해서는 복원계획에서 대상어종의 성장단계와 복원 시나리오를 고려해야 하고 정확하게 검토해야 하며, 생태학적 특성도 면밀히 조사되어야 할 것으로 사료된다. 또한 앞서 분석된 데이터는 최적의 하천 복원 유형을 판단하기 위한 기초자료 및 판단근거로 활용될 수 있을 것으로 기대된다.

• Journal of the Korean Society of Marine Environment & Safety
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• v.27 no.7
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• pp.1129-1136
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• 2021

A pan-tilt-zoom (PTZ) camera-based monitoring system for efficient monitoring in the engine room of a vessel was designed. A number of places exist where traditional analog instruments are still used in vessel engine rooms, and blind spots closely related to safety exist, for which flooding or fire is a concern. A camera-based monitoring system that guarantees a wide range at a relatively fast cycle for these monitoring points can be an effective alternative to enhance the safety of a vessel. Therefore, a multiview monitoring system is proposed in which the functions of the existing PTZ camera are further strengthened using a software. The monitoring system comprises four modules: camera control, location registration, traversal control, and multiview image reconstruction. The effectiveness of the method was evaluated through a series of experiments in an engine room environment.

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.437-437
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• 2023

최근 기후변화로 발생되는 폭우, 강풍 등의 기상현상으로 인해 하천범람, 내수침수, 해수범람 등 특히 해안도시지역에서의 물 문제는 날로 심화되고 있다. 이에 정부에서는 저영향개발(Low Impact Development, LID) 사업 및 친환경그린인프라(Green Infrastructure, GI) 기술요소의 적용확대를 추진하고 있다. 이에 환경부에서는 환경기술개발사업의 일환으로 '그린인프라 제도/정책 및 재원관리의 선진화(2021)' 연구용역을 통해 관련 추진체계 구축, 제도 개선방안 등을 모색하였다. 해당 연구에서는 기존의 LID 및 GI 관련 정책·제도 개선, 강우유출수 관리목표 설정방안, 투수/불투수도 제작 지침 마련, 시민인식조사 등을 통해 그린인프라 확대를 위한 과학적 근거 및 통합관리제도를 마련하였다. 이와 더불어 2013년부터 도시지역의 우수유출 저감, 물순환 구조 개선, 비점오염원 관리를 위해 '그린빗물인프라(Green Stormwater Infrastructure, GSI) 조성 사업'을 추진하여 국비지원을 지속하고 있다. 'GSI 조성사업'은 2014년 공공청사 중심에서 학교, 도서관, 체육시설, 공원 등 적용 범위를 확대 하고 있는 추세이나, 수도권지역과 물순환선도도시 조성사업이 진행중인 5개 지역(김해시, 광주시, 안동시, 울산시, 대전시)을 제외한 각 지자체에서는 실효성 있는 추진체계 및 가이드라인 부존 등의 문제로 적용에 어려움을 겪고 있다. 이에 경상남도는 지역적 특성을 반영한 GSI 조성 추진체계 마련을 목표로 본 연구용역을 추진하였으며, GSI 관련 국내외 현황조사, GSI 조성을 위한 공공청사의 우선순위 선정, 지형적(토지피복, 토양형 등), 기상학적 현황을 토대로 한 우선순위 선정, 이를 통합한 경남형 GSI 조성 추진체계를 제시하고자 한다.

• Journal of Korea Water Resources Association
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• v.46 no.1
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• pp.35-45
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• 2013

The aim of study is to present how to estimate and use the FRI (Flood Risk Index) for classifying area zones based on regional flooding risk in terms of the integrated flood risk management. To estimate the FRI at a spatial resolution of city/county/town units for the Nakdong River Watershed, the 17 representative flood indexing factors are carefully selected for the three flood indexes, such as PI (Pressure Index), SI (State Index), and RI (Response Index) under the P-S-R (Pressure-State-Response) classification system. Because flood indexing factors are measured at different scales and units, they are transformed into a common domain by the T-Score normalization technique. The entropy weight coefficient method is also applied to calculate the weight of flood indexing factors in order to reduce subjective judgement on the effect of weight coefficients. The three flood indexes of PI, SI, and RI are integrated for an overall value of the FRI to evaluate the flood risk of districts. To examine the practical application of the proposed FRI, the FRI results with/without the weight coefficients are compared with flooding zones of natural disaster risk areas officially announced in 2010. It is expected that the FRI ensured by full verification can make regional protection plans against flooding disasters with respect to causes and characteristics of past floods.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.24 no.3
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• pp.27-34
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• 2024

The direct and indirect damages caused by fires in underground utility tunnels have a great impact on society as a whole, so efforts are needed to prevent and manage them in advance. To this end, research is ongoing to prevent disasters such as fire flooding by applying digital twin technology to underground utility tunnels. A network is required to transmit the sensed signals from each sensor to the platform. In essence, it is necessary to analyze the application of wireless networks in the underground utility tunnel environments because the tunnel lacks the reception range of external wireless communication systems. Within the underground utility tunnels, electromagnetic interference caused by transmission and distribution cables, and diffuse reflection of signals from internal structures, obstacles, and metallic pipes such as water pipes can cause distortion or size reduction of wireless signals. To ensure real-time connectivity for remote surveillance and monitoring tasks through sensing, it is necessary to measure and analyze the wireless coverage in underground utility tunnels. Therefore, in order to build a wireless network environment in the underground utility tunnels. this study minimized the shaded area and measured the actual cavity environment so that there is no problem in connecting to the wireless environment inside the underground utility tunnels. We analyzed the data transmission rate, signal strength, and signal-to-noise ratio for each section of the terrain of the underground utility tunnels. The obtained results provide an appropriate wireless planning approach for installing wireless networks in underground utility tunnels.

• Journal of Korea Water Resources Association
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• v.43 no.1
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• pp.51-65
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• 2010

We suggest a simple and practical flood forecasting and warning system, which can predict change in the water level of a river in a small to medium-size watershed where flash flooding occurs in a short time. We first choose the flood defense target points, through evaluation of the flood risk of dike overflow and lowland inundation. Using data on rainfall, and on the water levels at the observed and prediction points, we investigate the interrelations and derive a regression formula from which we can predict the flood level at the target points. We calculate flood water levels through a calibrated flood simulation model for various rainfall scenarios, to overcome the shortage of real water stage data, and these results as basic population data are used to derive a regression formula. The values calculated from the regression formula are modified by the weather condition factor, and the system can finally predict the flood stages at the target points for every leading time. We also investigate the applicability of the prediction procedure for real flood events of the Jungnang Stream basin, and find the forecasting values to have close agreement with the surveyed data. We therefore expect that this suggested warning scheme could contribute usefully to the setting up of a flood forecasting and warning system for a small to medium-size river basin.

• Ecology and Resilient Infrastructure
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• v.3 no.3
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• pp.207-211
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• 2016

This study focuses on the categorization of the phenomenon of vegetative recruitment on riparian channels, so called, the phenomenon from "white river" to "green river", and proposes for the corresponding research direction. According to the literature review and research outputs obtained from the authors' previous research performed in Korea within a limited scope, the necessary and sufficient conditions for the recruitment and retrogression of riparian vegetation may be the mechanical disturbance (riverbed tractive stress), soil moisture (groundwater level, topography, composition of riverbed material, precipitation etc.), period of submergence, extreme weather, and nutrient inflow. In this study, two categories, one for the reduction in spring flood due to the change in spring precipitation pattern in unregulated rivers and the other for the increase in nutrient inflow into streams, both of which were partially proved, have been added in the categorization of the vegetative recruitment and retrogression on the riparian channels. In order to scientifically investigate further the phenomenon of the riparian vegetative recruitment and retrogression and develop the working riparian vegetative models, it is necessary to conduct a systematic nationwide survey on the "white to green" rivers, establishment of the categorization of the vegetation recruitment and retrogression based on the proof of those hypotheses and detailed categorization, development of the working mathematical models for the dynamic riparian vegetative recruitment and retrogression, and adaptive management for the river changes.

• Journal of the Korean Society for Marine Environment & Energy
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• v.16 no.4
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• pp.290-298
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• 2013

A Saemangeum Development Project, which is a national project in South Korea, has started with the objective of developing the reclaimed area mainly agricultural land use since the mid'80s. To develop a model of the global eco-reclamation, constructions of the eco-friendly counter facilities such as sluice gates and inner dikes, as well as environmental preservation measures for an estuary reservoir, have been carried out. However, reasonable measures of the water quality management for the Saemangeum area are required. Thus, the purpose of this study is to rigorously analyze and quantitatively evaluate the environmental problems due to the water level management associated with inner dike constructions. To achieve these objectives, the affecting factors on determination of water level management are described and a series of calibrated transient-state numerical simulations was performed to demonstrate the salinity distribution difference in the estuary before and after the construction of inner dikes. The overall salinity reduced about 2~5 psu, and the seawater intrusion was weakened by a well-regulated waterway after construction of the inner dikes compared to before construction of them.

• Korean Journal of Poultry Science
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• v.32 no.2
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• pp.107-112
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• 2005

This study was conducted to establish a comprehensive grading guideline for poultry. Guidelines for sampling size and grading were determined on the basis of survey data obtained from chicken processing house. Results were summarized as follows : For application unit, most chicken processing house preferred lot unit to farm unit. Most processing house did not want the total survey method, but selection sampling. At the beginning of the grading system, chicken processing house wanted to apply the system to a particular lots for which the company requests. There were much suggestions for grading not only portion meat, but also whole chicken. Bigger processing house preferred no. $8\~12$ to be graded. Most of large-scale processing houses used more than 81 volts for stunning and cooling tanks by soaking. For shipping chicken, Large-scale processing houses used both individual and box packing while small ones only used box packing.

• Journal of Korea Water Resources Association
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• v.41 no.9
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• pp.929-941
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• 2008

The objectives of this study are to propose a system for combined use of a hydrologic and a hydraulic model for urban flood forecast model and to evaluate the system on the $300km^2$ Jungrang urban watershed area, which is relatively large area as an urban watershed and consequently composed of very complex drainage pipes and streams with different land uses. In this study, SWMM for hydrologic model and HEC-RAS for hydraulic model are used and the study area is divided into 25 subbasins. The SWMM model is used for sewer drainage analysis within each subbasin, while HEC-RAS for unstready flow analysis in the channel streams. Also, this study develops a GUI system composed of mean areal precipitation input component, hydrologic runoff analysis component, stream channel routing component, and graphical representation of model output. The proposed system was calibrated for the model parameters and verified for the model applicability by using the observation data. The correlation coefficients between simulated and observed flows at the 2 important locations were ranged on 0.83-0.98, while the coefficients of model efficiency on 0.60-0.92 for the verification periods. This study also provided the possibilities of manhole overflows and channel bank inundation through the calculated water profile of longitudinal and channel sections, respectively. It can be concluded that the proposed system can be used as a surface runoff and channel routing models for urban flood forecast over the large watershed area.