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Water is one of the essential elements in human life, and the water-distribution system is an important infrastructure that distributes water to the people. The design of the water-distribution system was done manually in the past, but recently, it was conducted by applying optimization algorithms. Various optimization algorithms were developed for the optimal design of the water-distribution system, but there was a disadvantage to perform sensitivity analysis for parameter estimation manually. A vision-correction algorithm (VCA) was developed to emulate the conventional manual vision-correction procedure, and it exhibited a good performance in many mathematical benchmark and civil engineering problems. However, the VCA has limited usefulness because of its large number of parameters, many of which require estimation. In this study, a self-adaptive VCA (SAVCA) was developed to overcome these shortcomings by modifying the parameters of the VCA to be self-adaptive or fixed. The Balerma network — a water-distribution system — was selected as a civil engineering problem. The results of SAVCA were better than those of other methods for the design of Balerma network. The SAVCA exhibited good usability and performance and can be applied to various fields in civil engineering including the water-distribution system.
Eui Hoon Lee. Application of Self-adaptive Vision-Correction Algorithm for Water-Distribution Problem. KSCE Journal of Civil Engineering 2021, 25, 1106 -1115.
AMA StyleEui Hoon Lee. Application of Self-adaptive Vision-Correction Algorithm for Water-Distribution Problem. KSCE Journal of Civil Engineering. 2021; 25 (3):1106-1115.
Chicago/Turabian StyleEui Hoon Lee. 2021. "Application of Self-adaptive Vision-Correction Algorithm for Water-Distribution Problem." KSCE Journal of Civil Engineering 25, no. 3: 1106-1115.
A defining characteristic of the urbanization is the transformation of existing pervious areas into impervious areas during development. This leads to numerous hydrologic and environmental problems such as an increase in surface runoff due to excess rainfall, flooding, the deterioration of water quality, and an increase in nonpoint source pollution. Several studies propose supplementary measures on environmental change problems in development areas using the low impact development technique. This study investigated the reduction of nonpoint source pollutant loads and flooding in catchments through urban catchment rainfall–runoff management. For the quantitative assessment of flood disasters and water pollution problems, we propose a reliability evaluation technique. This technique refers to a series of analysis methods that determine the disaster prevention performance of the existing systems. As the two factors involve physical quantities of different dimensions, a reliability evaluation technique was developed using the distance measure method. Using the storm water management model, multiple scenarios based on synthetic rainfall in the catchment of the Daerim 2 rainwater pumping station in Seoul, South Korea, were examined. Our results indicate the need for efficient management of natural disaster risks that may occur in urban catchments. Moreover, this study can be used as a primary reference for setting a significant reduction target and facilitating accurate decision making concerning urban drainage system management.
Yang Ho Song; Jung Ho Lee; Eui Hoon Lee. Developing a Reliability Index of Low Impact Development for Urban Areas. Water 2020, 12, 2961 .
AMA StyleYang Ho Song, Jung Ho Lee, Eui Hoon Lee. Developing a Reliability Index of Low Impact Development for Urban Areas. Water. 2020; 12 (11):2961.
Chicago/Turabian StyleYang Ho Song; Jung Ho Lee; Eui Hoon Lee. 2020. "Developing a Reliability Index of Low Impact Development for Urban Areas." Water 12, no. 11: 2961.
Frequent localized torrential rains, excessive population density in urban areas, and increased impervious areas have led to massive flood damage that has been causing overloading of drainage systems (watersheds, reservoirs, drainage pump sites, etc.). Flood concerns are raised around the world in the events of rain. Flood forecasting, a typical nonstructural measure, was developed to help prevent repetitive flood damage. However, it is difficult to apply flood prediction techniques using training processes because training needs to be applied at every usage. Other techniques that use predicted rainfall data are also not appropriate for small watershed, such as single drainage area. Thus, in this paper, a flood prediction method is proposed by improving four criteria (50% water level, 70% water level, 100% water level, and first flooding of water pipes) in an attempt to reduce flooding in urban areas. The four criteria nodes are generated using a rainfall runoff simulation with synthetic rainfall at various durations. When applying real-time rainfall data, these nodes have the advantage of simple application. The improved flood nomograph made in this way is expected to help predict and prepare for rainstorms that can potentially cause flood damage.
Yeon Moon Choo; Deok Jun Jo; Gwan Seon Yun; Eui Hoon Lee; Choo; Jo; Yun; Lee. A Study on the Improvement of Flood Forecasting Techniques in Urban Areas by Considering Rainfall Intensity and Duration. Water 2019, 11, 1883 .
AMA StyleYeon Moon Choo, Deok Jun Jo, Gwan Seon Yun, Eui Hoon Lee, Choo, Jo, Yun, Lee. A Study on the Improvement of Flood Forecasting Techniques in Urban Areas by Considering Rainfall Intensity and Duration. Water. 2019; 11 (9):1883.
Chicago/Turabian StyleYeon Moon Choo; Deok Jun Jo; Gwan Seon Yun; Eui Hoon Lee; Choo; Jo; Yun; Lee. 2019. "A Study on the Improvement of Flood Forecasting Techniques in Urban Areas by Considering Rainfall Intensity and Duration." Water 11, no. 9: 1883.
The frequency of inundation in urban watersheds has increased, and structural measures have been conducted to prevent flood damage. The current non-structural measures for complementing structural measures are mostly independent non-structural measures. Unlike the current non-structural measures, the new operating technique based on flood forecasting is a real-time mixed measure, which means the combination of different non-structural measures. Artificial rainfall events based on the Huff distribution were used to generate preliminary and dangerous thresholds of flood forecasting. The new operation for centralized and decentralized reservoirs was conducted by two thresholds. The new operation showed good performance in terms of flooding and resilience based on historical rainfall events in 2010 and 2011. The flooding volume in the new operation decreased from 6617 to 3368 m3 compared to the current operation in 2010, and the flooding volume in 2011 decreased from 664 to 490 m3. In the 2010 event, the results of resilience were 0.831835 and 0.866566 in current and new operations, respectively. The result of resilience increased from 0.988823 to 0.993029 in the 2011 event. This suggestion can be applied to operating facilities in urban drainage systems and might provide a standard for the design process of urban drainage facilities.
Eui Hoon Lee; Lee. Advanced Operating Technique for Centralized and Decentralized Reservoirs Based on Flood Forecasting to Increase System Resilience in Urban Watersheds. Water 2019, 11, 1533 .
AMA StyleEui Hoon Lee, Lee. Advanced Operating Technique for Centralized and Decentralized Reservoirs Based on Flood Forecasting to Increase System Resilience in Urban Watersheds. Water. 2019; 11 (8):1533.
Chicago/Turabian StyleEui Hoon Lee; Lee. 2019. "Advanced Operating Technique for Centralized and Decentralized Reservoirs Based on Flood Forecasting to Increase System Resilience in Urban Watersheds." Water 11, no. 8: 1533.
Urban drainage systems are used to safely drain rainwater and prevent urban inundation, and their reliability is usually calculated from the probability of failure, which includes the probability of the drainage facilities being destroyed. This study proposes a new reliability index that includes three factors (flood volume, nodes, and damage), with the aim of prioritizing the structural and nonstructural measures required to improve urban drainage systems. In this study, synthetic rainfall data are generated by the Huff distribution and are used as input data for runoff simulations. The Distance Measure Method that uses a utopian approach is employed here to generate a dimensionless reliability index, as the three factors use different units and no definitive criteria currently exist to determine the weights that should be assigned to each factor. The reliability indexes of flood volume, nodes, and damage determined in this study are 0.7226, 0.4584 and 0.9750, respectively, as the three factors are weighted equally in the reliability index calculation. Using the new method, the reliability index of the city of Jeongup is 0.6484. The new reliability index can be used to assess the effectiveness of various flood mitigation measures in preparation for extreme rainfall events.
Eui Hoon Lee; Joong Hoon Kim. Development of a Reliability Index Considering Flood Damage for Urban Drainage Systems. KSCE Journal of Civil Engineering 2019, 23, 1872 -1880.
AMA StyleEui Hoon Lee, Joong Hoon Kim. Development of a Reliability Index Considering Flood Damage for Urban Drainage Systems. KSCE Journal of Civil Engineering. 2019; 23 (4):1872-1880.
Chicago/Turabian StyleEui Hoon Lee; Joong Hoon Kim. 2019. "Development of a Reliability Index Considering Flood Damage for Urban Drainage Systems." KSCE Journal of Civil Engineering 23, no. 4: 1872-1880.
Recently, the number of extreme rainfall events has increased because of climate change. The ever-widening impervious area in urban watersheds also continuously augments runoff volume. Most measures to prevent urban inundation are structural, such as the construction, rehabilitation, and replacement of urban drainage facilities. Because structural measures require time and money, nonstructural measures are also required for the efficient prevention of urban inundation. Current operations in Korea focus on the individual operation of urban drainage facilities while neglecting the status of effluent streams. A study on urban drainage facilities that considers the status of urban streams is necessary to improve the operation of drainage facilities in urban areas. A revised resilience index is suggested to evaluate measures. For the historical rainfall event in 2010, the system resilience for current and integrated operations was 0.199 and 0.238, respectively. For the 2011 event, the system resilience for current and integrated operations was 0.064 and 0.235, respectively. The integrated operation exhibited good performance for the 2010 and 2011 events. Based on the results of this study, an operation as a nonstructural measure for the total management of urban areas is proposed. The revised resilience index could support decision-making processes for flood-management plans.
Eui Hoon Lee; Young Hwan Choi; Joong Hoon Kim. Real-Time Integrated Operation for Urban Streams with Centralized and Decentralized Reservoirs to Improve System Resilience. Water 2019, 11, 69 .
AMA StyleEui Hoon Lee, Young Hwan Choi, Joong Hoon Kim. Real-Time Integrated Operation for Urban Streams with Centralized and Decentralized Reservoirs to Improve System Resilience. Water. 2019; 11 (1):69.
Chicago/Turabian StyleEui Hoon Lee; Young Hwan Choi; Joong Hoon Kim. 2019. "Real-Time Integrated Operation for Urban Streams with Centralized and Decentralized Reservoirs to Improve System Resilience." Water 11, no. 1: 69.
Various metaheuristic optimization algorithms are being developed and applied to find optimal solutions of real-world problems. Engineering benchmark problems have been often used for the performance comparison among metaheuristic algorithms, and water distribution system (WDS) design problem is one of the widely used benchmarks. However, only few traditional WDS design problems have been considered in the research community. Thus, it is very challenging to identify an algorithm’s better performance over other algorithms with such limited set of traditional benchmark problems of unknown characteristics. This study proposes an approach to generate WDS design benchmarks by changing five problem characteristic factors which are used to compare the performance of metaheuristic algorithms. Obtained optimization results show that WDS design benchmark problems generated with specific characteristic under control help identify the strength and weakness of reported algorithms. Finally, guidelines on the selection of a proper algorithm for WDS design problems are derived.
Ho Min Lee; Donghwi Jung; Ali Sadollah; Eui Hoon Lee; Joong Hoon Kim. Performance Comparison of Metaheuristic Optimization Algorithms Using Water Distribution System Design Benchmarks. Advances in Intelligent Systems and Computing 2018, 97 -104.
AMA StyleHo Min Lee, Donghwi Jung, Ali Sadollah, Eui Hoon Lee, Joong Hoon Kim. Performance Comparison of Metaheuristic Optimization Algorithms Using Water Distribution System Design Benchmarks. Advances in Intelligent Systems and Computing. 2018; ():97-104.
Chicago/Turabian StyleHo Min Lee; Donghwi Jung; Ali Sadollah; Eui Hoon Lee; Joong Hoon Kim. 2018. "Performance Comparison of Metaheuristic Optimization Algorithms Using Water Distribution System Design Benchmarks." Advances in Intelligent Systems and Computing , no. : 97-104.
Flood forecasting is a pre-emptive non-structural measure used to mitigate inundation. Most current flood forecasting techniques incorporate complex processes, such as training and optimization, before the technique can be applied. Conventional flood forecasting techniques, based on flood volume, provide alerts even if there is no significant risk of flood damage. In this study, a new flood forecasting technique has been developed based on likely flood damage using the multi-dimensional flood damage analysis method. This new flood forecasting technique overcomes the drawbacks of current flood forecasting techniques because it can be easily applied using rainfall data. The studied drainage area was divided into subareas, and the damage functions were obtained for each subarea using the flood volumes and damage information. Using these damage functions, the rainfall intensity when the flood damage initially occurred was calculated for each duration and subarea. The damage graph produced for flood forecasting in each subarea identified the rainfall intensities and durations that resulted from the initial occurrence of flood damage. This new flood forecasting technique could be used to save lives, valuable assets, and manage drainage areas.
Eui Hoon Lee; Joong Hoon Kim. Development of a flood-damage-based flood forecasting technique. Journal of Hydrology 2018, 563, 181 -194.
AMA StyleEui Hoon Lee, Joong Hoon Kim. Development of a flood-damage-based flood forecasting technique. Journal of Hydrology. 2018; 563 ():181-194.
Chicago/Turabian StyleEui Hoon Lee; Joong Hoon Kim. 2018. "Development of a flood-damage-based flood forecasting technique." Journal of Hydrology 563, no. : 181-194.
Soil slurry deposited on the surface of the Earth during rainfall mixes with fluids and flows into urban sewer conduits. Turbulent energy and energy dissipation in the conduits lead to separation, and sedimentation at the bottom lowers the discharge capacity of conduits. This study proposes a functional relationship between shear stress in urban sewer conduits and the physical properties of particles in a conduit bed containing less than 20 mm of soil. Several conditions were implemented for analyzing two-phase flow (soil slurry and fluid in urban sewer conduits) in terms of turbulent flow by considering soil slurry flowing into urban sewer conduits. The internal flows of fluid and soil slurry in urban sewer conduits were numerically analyzed and modeled by applying the Navier–Stokes equation and the k-ε turbulence model. The transfer deposition of the soil slurry in the conduits was reviewed and, based on the results, a limiting tractive force was calculated and used to propose criteria for transfer deposition occurring in urban sewer conduits.
Yang Ho Song; Eui Hoon Lee; Jung Ho Lee. Functional Relationship between Soil Slurry Transfer and Deposition in Urban Sewer Conduits. Water 2018, 10, 825 .
AMA StyleYang Ho Song, Eui Hoon Lee, Jung Ho Lee. Functional Relationship between Soil Slurry Transfer and Deposition in Urban Sewer Conduits. Water. 2018; 10 (7):825.
Chicago/Turabian StyleYang Ho Song; Eui Hoon Lee; Jung Ho Lee. 2018. "Functional Relationship between Soil Slurry Transfer and Deposition in Urban Sewer Conduits." Water 10, no. 7: 825.
The Muskingum flood routing model is a representative flood routing model. The field applicability of the Muskingum flood routing model is known to be good, and the structure of input data is simple. However, accurate flood routing cannot be conducted using current Muskingum flooding routing models due to the structural limitation of equations. The advanced nonlinear Muskingum flood routing model is suggested for improving accuracy, considering continuous flow using weighted inflow. Continuous flow means the past continuous inflows, including first and secondary inflow over time. Five flood data were selected for a comparison between the results of this study and previous ones. The sum of squares, root mean square errors, and Nash-Sutcliffe efficiency are applied in order to calculate the error values. The vision correction algorithm was used to estimate parameters in the new model. Generally, the new method yields better results than those described in previous studies, though it shows similar results with the most recent methods (NLMM-L) in some flood data. Finally, the new method and NLMM-L are applied for the prediction of Daechung flood data in Korea. The new method is useful in the prediction of outflows, because it shows better results than NLMM-L.
Eui Hoon Lee; Ho Min Lee; Joong Hoon Kim. Development and Application of Advanced Muskingum Flood Routing Model Considering Continuous Flow. Water 2018, 10, 760 .
AMA StyleEui Hoon Lee, Ho Min Lee, Joong Hoon Kim. Development and Application of Advanced Muskingum Flood Routing Model Considering Continuous Flow. Water. 2018; 10 (6):760.
Chicago/Turabian StyleEui Hoon Lee; Ho Min Lee; Joong Hoon Kim. 2018. "Development and Application of Advanced Muskingum Flood Routing Model Considering Continuous Flow." Water 10, no. 6: 760.
Oseong Lim; Do Guen Yoo; Eui Hoon Lee; Joong Hoon Kim; University of Suwon; Korea University. A Study on the Parameter Estimation of Sewer Network Model Using Sewer Level Data. Journal of Korean Society of Hazard Mitigation 2018, 18, 261 -269.
AMA StyleOseong Lim, Do Guen Yoo, Eui Hoon Lee, Joong Hoon Kim, University of Suwon, Korea University. A Study on the Parameter Estimation of Sewer Network Model Using Sewer Level Data. Journal of Korean Society of Hazard Mitigation. 2018; 18 (3):261-269.
Chicago/Turabian StyleOseong Lim; Do Guen Yoo; Eui Hoon Lee; Joong Hoon Kim; University of Suwon; Korea University. 2018. "A Study on the Parameter Estimation of Sewer Network Model Using Sewer Level Data." Journal of Korean Society of Hazard Mitigation 18, no. 3: 261-269.
Sedimentation commonly occurs in urban drainage systems, disrupts flow, and is one of the major causes of inundation. The complicated phenomena that alter the cross-section of sewer conduits include transportation, precipitation, and sedimentation, and need to be analyzed for the proper design and efficient maintenance of urban drainage systems. In this study, the discharge capacity of urban drainage systems is simulated and analyzed by considering the pattern of flow of sediments in sewer conduits through a numerical analysis model. The sites of the highest and lowest accumulation of soil were examined as sedimentation occurred, as was discharge due to accumulation in sewer conduits. The purpose of this study is the examination of mathematical models for two-phase fluid flow analysis and the prediction of sedimentation in urban sewer conduits. An expression for the height of the sedimentation was obtained to assess the discharge capacity of urban drainage systems, and a model to predict accumulation in sewer conduits was developed using non-dimensional variables for inlet velocity, inlet particle volume fraction, and particle size. When subjected to linear regression analysis, the model yielded a high correlation coefficient (R2) of 0.899. This satisfied the aims of this study, to obtain a higher discharge capacity and a plan for the design of urban drainage systems.
Yang Ho Song; Rin Yun; Eui Hoon Lee; Jung Ho Lee. Predicting Sedimentation in Urban Sewer Conduits. Water 2018, 10, 462 .
AMA StyleYang Ho Song, Rin Yun, Eui Hoon Lee, Jung Ho Lee. Predicting Sedimentation in Urban Sewer Conduits. Water. 2018; 10 (4):462.
Chicago/Turabian StyleYang Ho Song; Rin Yun; Eui Hoon Lee; Jung Ho Lee. 2018. "Predicting Sedimentation in Urban Sewer Conduits." Water 10, no. 4: 462.
Rainfall in rainy seasons continuously occurs and it is hard to separate individual events which is a significant source for the design of drainage facility to reduce Combined Sewer Overflows (CSOs). The current design of drainage facilities is based on the maximum design for rainfall events despite its extensive use in urban areas. The design of drainage facility requires the characteristics of rainfall such as average annual rainfall volume, duration and intensity. The individual rainfall events in a continuous rainfall event can be divided by Inter-event Time Definition (IETD). Current techniques for the determination of IETD are autocorrelation analysis, the coefficient of variation analysis, and average annual number of rainfall events analysis. The problem of the existing three methods for IETD is an ambiguous result for the decision. The new method for the determination of IETD using exponential function is suggested. The probability density function of the continuous rainfall event is compared with the confidence range of regression curve generated from the exponential functions at each inter-event time. The comparison of current and new method for the determination of IETD is conducted in the target watershed.
Eui Hoon Lee; Joong Hoon Kim. Development of New Inter-Event Time Definition Technique in Urban Areas. KSCE Journal of Civil Engineering 2018, 22, 3764 -3771.
AMA StyleEui Hoon Lee, Joong Hoon Kim. Development of New Inter-Event Time Definition Technique in Urban Areas. KSCE Journal of Civil Engineering. 2018; 22 (10):3764-3771.
Chicago/Turabian StyleEui Hoon Lee; Joong Hoon Kim. 2018. "Development of New Inter-Event Time Definition Technique in Urban Areas." KSCE Journal of Civil Engineering 22, no. 10: 3764-3771.
Imperviousness has increased due to urbanization, as has the frequency of extreme rainfall events by climate change. Various countermeasures, such as structural and nonstructural measures, are required to prepare for these effects. Flood forecasting is a representative nonstructural measure. Flood forecasting techniques have been developed for the prevention of repetitive flood damage in urban areas. It is difficult to apply some flood forecasting techniques using training processes because training needs to be applied at every usage. The other flood forecasting techniques that use rainfall data predicted by radar are not appropriate for small areas, such as single drainage basins. In this study, a new flood forecasting technique is suggested to reduce flood damage in urban areas. The flood nomograph consists of the first flooding nodes in rainfall runoff simulations with synthetic rainfall data at each duration. When selecting the first flooding node, the initial amount of synthetic rainfall is 1 mm, which increases in 1 mm increments until flooding occurs. The advantage of this flood forecasting technique is its simple application using real-time rainfall data. This technique can be used to prepare a preemptive response in the process of urban flood management.
Eui Hoon Lee; Joong Hoon Kim; Yeon Moon Choo; Deok Jun Jo. Application of Flood Nomograph for Flood Forecasting in Urban Areas. Water 2018, 10, 53 .
AMA StyleEui Hoon Lee, Joong Hoon Kim, Yeon Moon Choo, Deok Jun Jo. Application of Flood Nomograph for Flood Forecasting in Urban Areas. Water. 2018; 10 (1):53.
Chicago/Turabian StyleEui Hoon Lee; Joong Hoon Kim; Yeon Moon Choo; Deok Jun Jo. 2018. "Application of Flood Nomograph for Flood Forecasting in Urban Areas." Water 10, no. 1: 53.
Pump stations prevent backwater effects from urban streams and safely drain rainwater in urban areas. Urbanization has increased the required capacity of centralized reservoirs and drainage pumps; yet, their respective designs are based on the runoff of the target watershed at the time of design. In Korea, additional pump stations are constructed to supplement the insufficient capacity of centralized reservoirs and drainage pumps. Two pump stations in the same drainage area share centralized reservoirs, and there are gates between them. Operation of the gates and drainage pumps is based on the water level in the connected centralized reservoirs. The convertible operation is based on changes in flow between two pump stations with different effluent streams in shared centralized reservoirs. Efficient distribution of inflow to both pump stations provides additional storage capacity in centralized reservoirs and rapid drainage. For a rainfall event in 2010, flooding volumes for current and convertible operations were 58,750 and 7507 m3, respectively. For an event in 2011, the corresponding figures were 3697 and 471 m3. This shows that resilience increased by 0.10829 and 0.00756, respectively, for the two events. Accordingly, a new technique to operate multiple pump stations for reducing urban inundation is proposed.
Eui Hoon Lee; Joong Hoon Kim. Convertible Operation Techniques for Pump Stations Sharing Centralized Reservoirs for Improving Resilience in Urban Drainage Systems. Water 2017, 9, 843 .
AMA StyleEui Hoon Lee, Joong Hoon Kim. Convertible Operation Techniques for Pump Stations Sharing Centralized Reservoirs for Improving Resilience in Urban Drainage Systems. Water. 2017; 9 (11):843.
Chicago/Turabian StyleEui Hoon Lee; Joong Hoon Kim. 2017. "Convertible Operation Techniques for Pump Stations Sharing Centralized Reservoirs for Improving Resilience in Urban Drainage Systems." Water 9, no. 11: 843.
In this study, a metaheuristic optimization algorithm inspired by a vision correction procedure is applied to civil engineering problems. The Vision Correction Algorithm (VCA) has the ability to solve various problems related to mathematical benchmark functions and civil engineering. Vision correction processes have three main steps: myopic/hyperopic correction, brightness adjustment/compression enforcement, and astigmatic correction. This procedure is essential for increasing the usability of glasses and obtaining high-quality vision in humans. Unlike conventional meta-heuristic algorithms, VCA automatically adjusts the global/ local search probability and global search direction based on accumulated optimization results. In VCA, all decision variables have their own search probabilities and require different processes according to whether a global search or local search is required. The proposed algorithm is applied to representative optimization problems, and the results are compared with those of existing algorithms. In civil engineering problems including design problem of water distribution network, VCA shows respectable results compared with those of existing algorithms. In all benchmark problems and civil engineering problems, VCA shows good results and it showed the applicability to other civil engineering problems.
Eui Hoon Lee; Do Guen Yoo; Joong Hoon Kim. Application of a Meta-heuristic Optimization Algorithm Motivated by a Vision Correction Procedure for Civil Engineering Problems. KSCE Journal of Civil Engineering 2017, 22, 2623 -2636.
AMA StyleEui Hoon Lee, Do Guen Yoo, Joong Hoon Kim. Application of a Meta-heuristic Optimization Algorithm Motivated by a Vision Correction Procedure for Civil Engineering Problems. KSCE Journal of Civil Engineering. 2017; 22 (7):2623-2636.
Chicago/Turabian StyleEui Hoon Lee; Do Guen Yoo; Joong Hoon Kim. 2017. "Application of a Meta-heuristic Optimization Algorithm Motivated by a Vision Correction Procedure for Civil Engineering Problems." KSCE Journal of Civil Engineering 22, no. 7: 2623-2636.
Eui Hoon Lee; Yong Sik Lee; Jin Gul Joo; Donghwi Jung; Joong Hoon Kim. Investigating the Impact of Proactive Pump Operation and Capacity Expansion on Urban Drainage System Resilience. Journal of Water Resources Planning and Management 2017, 143, 04017024 .
AMA StyleEui Hoon Lee, Yong Sik Lee, Jin Gul Joo, Donghwi Jung, Joong Hoon Kim. Investigating the Impact of Proactive Pump Operation and Capacity Expansion on Urban Drainage System Resilience. Journal of Water Resources Planning and Management. 2017; 143 (7):04017024.
Chicago/Turabian StyleEui Hoon Lee; Yong Sik Lee; Jin Gul Joo; Donghwi Jung; Joong Hoon Kim. 2017. "Investigating the Impact of Proactive Pump Operation and Capacity Expansion on Urban Drainage System Resilience." Journal of Water Resources Planning and Management 143, no. 7: 04017024.
Flooding volume in urban areas is not linearly proportional to flooding damage because, in some areas, no flooding damage occurs until the flooding depth reaches a certain point, whereas flooding damage occurs in other areas whenever flooding occurs. Flooding damage is different from flooding volume because each subarea has different components. A resilience index for urban drainage systems was developed based on flooding damage. In this study, the resilience index based on flooding damage in urban areas was applied to the Sintaein basin in Jeongup, Korea. The target watershed was divided into five subareas according to the status of land use in each subarea. The damage functions between flooding volume and flooding damage were calculated by multi-dimensional flood damage analysis. The extent of flooding damage per minute was determined from the results of flooding volume per minute using damage functions. The values of the resilience index based on flooding damages were distributed from 0.797292 to 0.933741. The resilience index based on flooding damage suggested in this study can reflect changes in urban areas and can be used for the evaluation of flood control plans such as the installation, replacement, and rehabilitation of drainage facilities.
Eui Hoon Lee; Joong Hoon Kim. Development of Resilience Index Based on Flooding Damage in Urban Areas. Water 2017, 9, 428 .
AMA StyleEui Hoon Lee, Joong Hoon Kim. Development of Resilience Index Based on Flooding Damage in Urban Areas. Water. 2017; 9 (6):428.
Chicago/Turabian StyleEui Hoon Lee; Joong Hoon Kim. 2017. "Development of Resilience Index Based on Flooding Damage in Urban Areas." Water 9, no. 6: 428.
Poor drainage of urban storm water can lead to urban inundation which presents a risk to people and property. Previous research has presented various measures to prevent and reduce urban flooding and these measures can be classified into costly but effective structural measures, and economical but less effective non-structural measures. This study suggests a new approach to reduce urban flooding by combining structural and non-structural measures in a target watershed in Seoul, South Korea. Inlet design modification in a detention reservoir (Decentralized Reservoir, DR) is examined in conjunction with combined inlet/outlet management for the DR. Monitoring nodes used to control DR inlet/outlet operations are selected by locating the first flooding node, maximum flooding node and DR inlet node. This new approach demonstrates outstanding flood volume reduction for historical flooding events that occurred in Seoul during 2010 and 2011. Flood volumes during the 2010 event using the combined inlet/outlet operation in the DR were between 1656 m3 and 1815 m3 compared to a flood volume of 6617 m3 using current DR operation. Finally, the suggested operating level for the DR based on the best hydraulic section, system resilience index, and local regulations is 1.2 m.
Eui Hoon Lee; Joong Hoon Kim. Design and Operation of Decentralized Reservoirs in Urban Drainage Systems. Water 2017, 9, 246 .
AMA StyleEui Hoon Lee, Joong Hoon Kim. Design and Operation of Decentralized Reservoirs in Urban Drainage Systems. Water. 2017; 9 (4):246.
Chicago/Turabian StyleEui Hoon Lee; Joong Hoon Kim. 2017. "Design and Operation of Decentralized Reservoirs in Urban Drainage Systems." Water 9, no. 4: 246.
Because of climate change, severe rainfall events that lead to lowland flooding and inundation problems are occurring more frequently, especially in urban areas, which have high population densities. In order to prevent inundation of urban areas, authorities in the Korean Government have set up integrated flood management plans and established spatial targets for rainfall runoff. These disaster prevention plans include measures such as improvements to the sewer pipe capacity and the construction of downstream pump stations, rainwater storage sites, and infiltration facilities. The main purpose of pervious design plans is to reduce the flood volume in target areas, and this research presents a new method for developing rainwater storage design plans while considering potential flood damage costs in urban areas. The new planning method for storage facility design was applied to a single watershed in the Sintaein basin in the city of Jeongeup, Jeonbuk, South Korea. The results indicated that flood damage costs could be reduced when this new concept for determining the location of storage facilities is used.
Hyeonseok Choi; Eui Hoon Lee; Jin Gul Joo; Joong Hoon Kim. Determining optimal locations for rainwater storage sites with the goal of reducing urban inundation damage costs. KSCE Journal of Civil Engineering 2016, 21, 2488 -2500.
AMA StyleHyeonseok Choi, Eui Hoon Lee, Jin Gul Joo, Joong Hoon Kim. Determining optimal locations for rainwater storage sites with the goal of reducing urban inundation damage costs. KSCE Journal of Civil Engineering. 2016; 21 (6):2488-2500.
Chicago/Turabian StyleHyeonseok Choi; Eui Hoon Lee; Jin Gul Joo; Joong Hoon Kim. 2016. "Determining optimal locations for rainwater storage sites with the goal of reducing urban inundation damage costs." KSCE Journal of Civil Engineering 21, no. 6: 2488-2500.