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Water pipe leaks due to seismic damage are more difficult to detect than bursts, and such leaks, if not repaired in a timely manner, can eventually reduce supply pressure and generate both pollutant penetration risks and economic losses. Therefore, leaks must be promptly identified, and damaged pipes must be replaced or repaired. Leak-detection using equipment in the field is accurate; however, it is a considerably labor-intensive process that necessitates expensive equipment. Therefore, indirect leak detection methods applicable before fieldwork are necessary. In this study, a computer-based, multiple-leak-detection model is developed. The proposed technique uses observational data, such as the pressure and flow rate, in conjunction with an optimization method and hydraulic analysis simulations, to improve detection efficiency (DE) for multiple leaks in the field. A novel approach is proposed, i.e., use of a cascade and iteration search algorithms to effectively detect multiple leaks (with the unknown locations, quantities, and sizes encountered in real-world situations) due to large-scale disasters, such as earthquakes. This method is verified through application to small block-scale water distribution networks (WDNs), and the DE is analyzed. The proposed detection model can be used for efficient leak detection and the repair of WDNs following earthquakes.
Jeongwook Choi; Gimoon Jeong; Doosun Kang. Multiple Leak Detection in Water Distribution Networks Following Seismic Damage. Sustainability 2021, 13, 8306 .
AMA StyleJeongwook Choi, Gimoon Jeong, Doosun Kang. Multiple Leak Detection in Water Distribution Networks Following Seismic Damage. Sustainability. 2021; 13 (15):8306.
Chicago/Turabian StyleJeongwook Choi; Gimoon Jeong; Doosun Kang. 2021. "Multiple Leak Detection in Water Distribution Networks Following Seismic Damage." Sustainability 13, no. 15: 8306.
Contamination in water distribution networks (WDNs) can occur at any time and location. One protection measure in WDNs is the placement of water quality sensors (WQSs) to detect contamination and provide information for locating the potential contamination source. The placement of WQSs in WDNs must be optimally planned. Therefore, a robust sensor-placement strategy (SPS) is vital. The SPS should have clear objectives regarding what needs to be achieved by the sensor configuration. Here, the objectives of the SPS were set to cover the contamination event stages of detection, consumption, and source localization. As contamination events occur in any form of intrusion, at any location and time, the objectives had to be tested against many possible scenarios, and they needed to reach a fair value considering all scenarios. In this study, the particle swarm optimization (PSO) algorithm was selected as the optimizer. The SPS was further reinforced using a databasing method to improve its computational efficiency. The performance of the proposed method was examined by comparing it with a benchmark SPS example and applying it to DMA-sized, real WDNs. The proposed optimization approach improved the overall fitness of the configuration by 23.1% and showed a stable placement behavior with the increase in sensors.
Malvin Marlim; Doosun Kang. Optimal Water Quality Sensor Placement by Accounting for Possible Contamination Events in Water Distribution Networks. Water 2021, 13, 1999 .
AMA StyleMalvin Marlim, Doosun Kang. Optimal Water Quality Sensor Placement by Accounting for Possible Contamination Events in Water Distribution Networks. Water. 2021; 13 (15):1999.
Chicago/Turabian StyleMalvin Marlim; Doosun Kang. 2021. "Optimal Water Quality Sensor Placement by Accounting for Possible Contamination Events in Water Distribution Networks." Water 13, no. 15: 1999.
Rational water resource management is used to ensure a stable supply of water by predicting the supply of and demand for future water resources. However, rational water allocation will become more difficult in the future owing to the effects of climate change, causing water shortages and disputes. In this study, an advanced hydro-economic water allocation and management model (WAMM) was introduced by improving the optimization scheme employed in conventional models and incorporating the economic value of water. By relying upon economic valuation, the WAMM can support water allocation efforts that focus not only on the stability but also on the economic benefits of water supply. The water supply risk was evaluated following the different objective functions and optimization methods provided by the WAMM using a case study of the Namhan River basin in South Korea under a climate change scenario over the next 30 years. The water shortages and associated economic damage were compared, and the superior ability of WAMM to mitigate future water shortages using economic valuation and full-step linear programming (FSLP) optimization was demonstrated. It is expected that the WAMM can be applied to help resolve water shortages and disputes among river basin units under severe drought conditions.
Gimoon Jeong; Doosun Kang. Hydro-Economic Water Allocation Model for Water Supply Risk Analysis: A Case Study of Namhan River Basin, South Korea. Sustainability 2021, 13, 6005 .
AMA StyleGimoon Jeong, Doosun Kang. Hydro-Economic Water Allocation Model for Water Supply Risk Analysis: A Case Study of Namhan River Basin, South Korea. Sustainability. 2021; 13 (11):6005.
Chicago/Turabian StyleGimoon Jeong; Doosun Kang. 2021. "Hydro-Economic Water Allocation Model for Water Supply Risk Analysis: A Case Study of Namhan River Basin, South Korea." Sustainability 13, no. 11: 6005.
Operation and management of a water distribution network (WDN) by district metered areas (DMAs) bring many benefits for water utilities, particularly regarding water loss control and pressure management. However, the optimal design of DMAs in a WDN is a challenging task. This paper proposes an approach for the optimal design of DMAs in the multiple-criteria decision analysis (MCDA) framework based on the outcome of a coupled model comprising a self-organizing map (SOM) and a community structure algorithm (CSA). First, the clustering principle of the SOM algorithm is applied to construct initial homologous clusters in terms of pressure and elevation. CSA is then coupled to refine the SOM-based initial clusters for the automated creation of multiscale and dynamic DMA layouts. Finally, the criteria for quantifying the performance of each DMA layout solution are assessed in the MCDA framework. Verifying the model on a hypothetical network and an actual WDN proved that it could efficiently create homologous and dynamic DMA layouts capable of adapting to water demand variability.
Xuan Bui; Malvin Marlim; Doosun Kang. Optimal Design of District Metered Areas in a Water Distribution Network Using Coupled Self-Organizing Map and Community Structure Algorithm. Water 2021, 13, 836 .
AMA StyleXuan Bui, Malvin Marlim, Doosun Kang. Optimal Design of District Metered Areas in a Water Distribution Network Using Coupled Self-Organizing Map and Community Structure Algorithm. Water. 2021; 13 (6):836.
Chicago/Turabian StyleXuan Bui; Malvin Marlim; Doosun Kang. 2021. "Optimal Design of District Metered Areas in a Water Distribution Network Using Coupled Self-Organizing Map and Community Structure Algorithm." Water 13, no. 6: 836.
Water distribution networks (WDNs) comprise a complex network of pipes and are crucial for providing potable water to urban communities. Therefore, WDNs must be carefully managed to avoid problems such as water contamination and service failures; however, this requires a large budget. Because WDN components have different statuses depending on their installation year, location, transmission pressure, and flow rate, it is difficult to plan the rehabilitation schedule within budgetary constraints. This study, therefore, proposes a new pipe replacement scheduling approach to smooth the investment time series based on a life cycle cost (LCC) assessment for a large-scale WDN. The proposed scheduling plan simultaneously considers both the annual budget limitation and the optimum expenditure on the useful life of pipes. A multi-objective optimization problem consisting of three decision-making objectives—minimum imposed LCC on the network, minimum standard deviation of annual investment, and minimum average age of the network—is thus solved using a nondominated sorting genetic algorithm to obtain an optimal plan. Three scenarios with different pipe replacement time spans and different annual budget constraints are considered accordingly. The results indicate that the proposed scheduling framework provides an efficient water pipe replacement scheduling plan with a smooth management budget.
Fatemeh Ghobadi; Gimoon Jeong; Doosun Kang. Water Pipe Replacement Scheduling Based on Life Cycle Cost Assessment and Optimization Algorithm. Water 2021, 13, 605 .
AMA StyleFatemeh Ghobadi, Gimoon Jeong, Doosun Kang. Water Pipe Replacement Scheduling Based on Life Cycle Cost Assessment and Optimization Algorithm. Water. 2021; 13 (5):605.
Chicago/Turabian StyleFatemeh Ghobadi; Gimoon Jeong; Doosun Kang. 2021. "Water Pipe Replacement Scheduling Based on Life Cycle Cost Assessment and Optimization Algorithm." Water 13, no. 5: 605.
Contamination events in water distribution networks (WDNs) could have severe health and economic consequences. Contaminants can be deliberately or accidentally introduced into the WDN. Quick identification of the injection location and time is important in devising a mitigation plan to prevent further spread of the contaminant in the network. A method of identifying the possible intrusion point in a given network and reporting data is to use an inverse calculation by backtracking the potential path of the contaminant in the network. However, there is an element of uncertainty in the data used for calculation, particularly in water flow and sensor report time. Given the uncertainties, a method was developed in this study for fast and accurate contaminant source identification. This paper proposes a comparison filter of results by first identifying potential contaminant locations through backtracking, followed by a forward calculation to determine the injection time range, thereby reducing the potential suspects and providing likeliness comparison among the suspects. The effectiveness of the proposed method was examined by applying it to a benchmark WDN. By simulating uncertainties and filtering through the results, several possible contaminant intrusion locations and times were identified.
Malvin S. Marlim; Doosun Kang. Identifying Contaminant Intrusion in Water Distribution Networks under Water Flow and Sensor Report Time Uncertainties. Water 2020, 12, 3179 .
AMA StyleMalvin S. Marlim, Doosun Kang. Identifying Contaminant Intrusion in Water Distribution Networks under Water Flow and Sensor Report Time Uncertainties. Water. 2020; 12 (11):3179.
Chicago/Turabian StyleMalvin S. Marlim; Doosun Kang. 2020. "Identifying Contaminant Intrusion in Water Distribution Networks under Water Flow and Sensor Report Time Uncertainties." Water 12, no. 11: 3179.
With recent increases of heavy rainfall during the summer season, South Korea is hit by substantial flood damage every year. To reduce such flood damage and cope with flood disasters, it is necessary to reliably estimate design floods. Despite the ongoing efforts to develop practical design practice, it has been difficult to develop a standardized guideline due to the lack of hydrologic data, especially flood data. In fact, flood frequency analysis (FFA) is impractical for ungauged watersheds, and design rainfall–runoff analysis (DRRA) overestimates design floods. This study estimated the appropriate design floods at ungauged watersheds by combining the DRRA and watershed characteristics using machine learning methods, including decision tree, random forest, support vector machine, deep neural network, the Elman recurrent neural network, and the Jordan recurrent neural network. The proposed models were validated using K-fold cross-validation to reduce overfitting and were evaluated based on various error measures. Even though the DRRA overestimated the design floods by 160%, on average, for our study areas the proposed model using random forest reduced the errors and estimated design floods at 99% of the FFA, on average.
Jin-Young Lee; Changhyun Choi; Doosun Kang; Byung Kim; Tae-Woong Kim. Estimating Design Floods at Ungauged Watersheds in South Korea Using Machine Learning Models. Water 2020, 12, 3022 .
AMA StyleJin-Young Lee, Changhyun Choi, Doosun Kang, Byung Kim, Tae-Woong Kim. Estimating Design Floods at Ungauged Watersheds in South Korea Using Machine Learning Models. Water. 2020; 12 (11):3022.
Chicago/Turabian StyleJin-Young Lee; Changhyun Choi; Doosun Kang; Byung Kim; Tae-Woong Kim. 2020. "Estimating Design Floods at Ungauged Watersheds in South Korea Using Machine Learning Models." Water 12, no. 11: 3022.
The performance of water distribution networks (WDNs) can be quantified by several types of hydraulic measure. In design and operation of a WDN, sufficient consideration should be given to system performance, and it would be inefficient to separately consider individual characteristics of hydraulic measures. Instead, various reliability indices have been developed and utilized to evaluate the performance of WDNs; however, deciding which index to use according to a particular WDN situation has not been investigated in sufficient depth. In this regard, this study analyzes the correlation between representative reliability indices and hydraulic measures to propose the most adequate reliability index according to the desired system performance in various situations. Specifically, six hydraulic measures representing system performance were selected from the viewpoint of redundancy, robustness, and serviceability. In addition, nine indices for estimating system reliability were classified based on theoretical backgrounds such as hydraulic, topological, entropic, and mixed approaches. The correlations between the nine indices and six measures were analyzed using 17 sample hypothetical networks with different layouts, under three water supply scenarios, and the overall evaluation results for each reliability index are presented through multi-criteria decision analysis.
Gimoon Jeong; Doosun Kang. Comparative Analysis of Reliability Indices and Hydraulic Measures for Water Distribution Network Performance Evaluation. Water 2020, 12, 2399 .
AMA StyleGimoon Jeong, Doosun Kang. Comparative Analysis of Reliability Indices and Hydraulic Measures for Water Distribution Network Performance Evaluation. Water. 2020; 12 (9):2399.
Chicago/Turabian StyleGimoon Jeong; Doosun Kang. 2020. "Comparative Analysis of Reliability Indices and Hydraulic Measures for Water Distribution Network Performance Evaluation." Water 12, no. 9: 2399.
To restore water pipes damaged by earthquakes, it is common to block the water flow by closing the associated shut-off valves. In this process, water supply suspension in the area connected to the isolated pipes is inevitable, which decreases the serviceability of the water distribution network (WDN). In this study, we identified the impact of valve layout (i.e., number and location) on system serviceability during a seismic damage restoration process. By conducting a pressure-driven-analysis (PDA) using EPANET 3.0, a more realistic hydraulic analysis could be carried out under the seismically damaged condition. Furthermore, by considering the valve-controlled segment in the hydraulic simulation, a more realistic water suspension area was determined, and efficient seismic damage restoration strategies were identified. The developed model was implemented on a WDN to demonstrate the effect of valve layout on the post-earthquake restoration process. Finally, effective restoration strategies were suggested for the application network.
Jeongwook Choi; Doosun Kang. Improved Hydraulic Simulation of Valve Layout Effects on Post-Earthquake Restoration of a Water Distribution Network. Sustainability 2020, 12, 3492 .
AMA StyleJeongwook Choi, Doosun Kang. Improved Hydraulic Simulation of Valve Layout Effects on Post-Earthquake Restoration of a Water Distribution Network. Sustainability. 2020; 12 (8):3492.
Chicago/Turabian StyleJeongwook Choi; Doosun Kang. 2020. "Improved Hydraulic Simulation of Valve Layout Effects on Post-Earthquake Restoration of a Water Distribution Network." Sustainability 12, no. 8: 3492.
The increasing frequency of extreme droughts and flash floods in recent years due to climate change has increased the interest in sustainable water use and efficient water resource management. Because the water resource sector is closely related to human activities and affected by interactions between the humanities and social sciences, there is a need for interdisciplinary research that can consider various elements, such as society and the economy. This study elucidates relationships within the social and hydrological systems and quantitatively analyzes the effects of a multi-purpose dam on the target society using a system dynamics model. A causal loop was used to identify causal relationships between the social and hydrological components of the target area, and a simulation model was constructed using the system dynamics technique. Additionally, climate change and socio-economic scenarios were applied to analyze the future effects of the multi-purpose dam on population change, the regional economy, water use, and flood damage prevention in the target area. The model proved reliable in predicting socio-economic changes in the target area and can be used to make decisions about efficient water resource management and water-resource-related facility planning.
Sleemin Lee; Doosun Kang. Analyzing the Effectiveness of a Multi-Purpose Dam Using a System Dynamics Model. Water 2020, 12, 1062 .
AMA StyleSleemin Lee, Doosun Kang. Analyzing the Effectiveness of a Multi-Purpose Dam Using a System Dynamics Model. Water. 2020; 12 (4):1062.
Chicago/Turabian StyleSleemin Lee; Doosun Kang. 2020. "Analyzing the Effectiveness of a Multi-Purpose Dam Using a System Dynamics Model." Water 12, no. 4: 1062.
A water distribution network (WDN) is an indispensable element of civil infrastructure that provides fresh water for domestic use, industrial development, and fire-fighting. However, in a large and complex network, operation and management (O&M) can be challenging. As a technical initiative to improve O&M efficiency, the paradigm of “divide and conquer” can divide an original WDN into multiple subnetworks. Each subnetwork is controlled by boundary pipes installed with gate valves or flow meters that control the water volume entering and leaving what are known as district metered areas (DMAs). Many approaches to creating DMAs are formulated as two-phase procedures, clustering and sectorizing, and are called water network partitioning (WNP) in general. To assess the benefits and drawbacks of DMAs in a WDN, we provide a comprehensive review of various state-of-the-art approaches, which can be broadly classified as: (1) Clustering algorithms, which focus on defining the optimal configuration of DMAs; and (2) sectorization procedures, which physically decompose the network by selecting pipes for installing flow meters or gate valves. We also provide an overview of emerging problems that need to be studied.
Xuan Khoa Bui; Malvin S. Marlim; Doosun Kang. Water Network Partitioning into District Metered Areas: A State-Of-The-Art Review. Water 2020, 12, 1002 .
AMA StyleXuan Khoa Bui, Malvin S. Marlim, Doosun Kang. Water Network Partitioning into District Metered Areas: A State-Of-The-Art Review. Water. 2020; 12 (4):1002.
Chicago/Turabian StyleXuan Khoa Bui; Malvin S. Marlim; Doosun Kang. 2020. "Water Network Partitioning into District Metered Areas: A State-Of-The-Art Review." Water 12, no. 4: 1002.
Water resources are essential for human life and closely related to various social and economic factors (e.g. land use, population, economic development, environment, etc). Also, such human activities affect hydrological environment conversely. Thus, socio-hydrology interdisciplinary studies that consider both hydro-engineering and socio-economic behavior are needed. Multi-purpose dam is a large water infrastructure mitigating water-related disasters by flood control and stable water supply. However, the effectiveness of multi-purpose dam besides the disaster mitigation has not been well analyzed, such as the social and economic influence to downstream area. This study aims to understand the relationship between the socio- and hydrology-sectors and quantitatively analyze the effects of the multi-purpose dam in target area. The representative components of socio-sector are population, land use, GRDP (gross regional domestic product), and flood/drought damages, and the hydrology-sector includes dam inflow/outflow, precipitation, and water demand. A causal loop was developed to identify the causal relationship between the socio- and hydrology-components, and a socio-hydrology system model was constructed using a system-dynamics technique. Various climate and socio-economic scenarios were applied to analyze the future effects of the multi-purpose dam on the population, regional economy, water supply, and flood damage prevention of the target area. The constructed socio-hydrology model can be used in decision-making for efficient water management and water facility planning.
Keywords: Climate change, Multi-purpose dam, Socio-hydrology, System-dynamics modeling
Acknowledgment: This study is supported by Korea Ministry of Environment (MOE) as “Graduate School specialized in Climate Change”.
Sleemin Lee; Doosun Kang. Effectiveness Analysis of Multi-purpose Dam: Socio-hydrology Modeling Approach. 2020, 1 .
AMA StyleSleemin Lee, Doosun Kang. Effectiveness Analysis of Multi-purpose Dam: Socio-hydrology Modeling Approach. . 2020; ():1.
Chicago/Turabian StyleSleemin Lee; Doosun Kang. 2020. "Effectiveness Analysis of Multi-purpose Dam: Socio-hydrology Modeling Approach." , no. : 1.
A water distribution network (WDN) is a critical infrastructure that must be maintained, ensuring a proper water supply to widespread customers. A WDN consists of various components, such as pipes, valves, pumps, and tanks, and these elements interact with each other to provide adequate system performance. If the elements fail due to internal or external interruptions, this may adversely impact water service to different degrees depending on the failed elements. To determine an appropriate maintenance priority, the critical elements need to be identified and mapped in the network. To identify and prioritize the critical elements (here, we focus on the pipes only) in the WDN, an element-based simulation approach is proposed, in which all the composing pipes of the WDN are reviewed one at a time. The element-based criticality is measured using several criticality indexes that are newly proposed in this study. The proposed criticality indexes are used to quantify the impacts of element failure to water service degradation. Here, four criticality indexes are developed: supply shortage (SS), economic value loss (EVL), pressure decline (PD), and water age degradation (WAD). Each of these indexes measures different aspects of the consequences, specifically social, economic, hydraulic, and water quality, respectively. The separate values of the indexes from all pipes in a network are then combined into a singular criticality value for assessment. For demonstration, the proposed approach is applied to four real WDNs to identify and prioritize the critical pipes. The proposed element-based simulation approach can be used to identify the critical components and setup maintenance scheduling of WDNs for preparedness of failure events.
Malvin S. Marlim; Gimoon Jeong; Doosun Kang. Identification of Critical Pipes Using a Criticality Index in Water Distribution Networks. Applied Sciences 2019, 9, 4052 .
AMA StyleMalvin S. Marlim, Gimoon Jeong, Doosun Kang. Identification of Critical Pipes Using a Criticality Index in Water Distribution Networks. Applied Sciences. 2019; 9 (19):4052.
Chicago/Turabian StyleMalvin S. Marlim; Gimoon Jeong; Doosun Kang. 2019. "Identification of Critical Pipes Using a Criticality Index in Water Distribution Networks." Applied Sciences 9, no. 19: 4052.
A Water-Energy-Food Nexus Simulation Model (WEFSiM) is proposed to quantify the nation-wide resources sustainability. WEFSiM considers the feedback connections between water, energy, and food sectors in a single framework. The optimization module provides more alternatives for resource management planning. The effect of a new energy plan in South Korea (Energy 2030) is simulated in a nexus perspective.
Albert Wicaksono; Gimoon Jeong; Doosun Kang. WEFSiM: A Model for Water–Energy–Food Nexus Simulation and Optimization. Plant-Microbes-Engineered Nano-particles (PM-ENPs) Nexus in Agro-Ecosystems 2019, 55 -58.
AMA StyleAlbert Wicaksono, Gimoon Jeong, Doosun Kang. WEFSiM: A Model for Water–Energy–Food Nexus Simulation and Optimization. Plant-Microbes-Engineered Nano-particles (PM-ENPs) Nexus in Agro-Ecosystems. 2019; ():55-58.
Chicago/Turabian StyleAlbert Wicaksono; Gimoon Jeong; Doosun Kang. 2019. "WEFSiM: A Model for Water–Energy–Food Nexus Simulation and Optimization." Plant-Microbes-Engineered Nano-particles (PM-ENPs) Nexus in Agro-Ecosystems , no. : 55-58.
The water–energy–food nexus (WEF nexus) concept is a novel approach to manage limited resources. Since 2011, a number of studies were conducted to develop computer simulation models quantifying the interlinkage among water, energy, and food sectors. Advancing a nationwide WEF nexus simulation model (WEFSiM) previously developed by the authors, this study proposes an optimization module (WEFSiM-opt) to assist stakeholders in making informed decisions concerning sustainable resource management. Both single- and multi-objective optimization modules were developed to maximize the user reliability index (URI) for water, energy, and food sectors by optimizing the priority index and water allocation decisions. In this study, the developed models were implemented in Korea to determine optimal resource allocation and management decisions under a plausible drought scenario. This study suggests that the optimization approach can advance WEF nexus simulation and provide better solutions for managing limited resources. It is anticipated that the proposed WEFSiM-opt can be utilized as a decision support tool for designing resource management plans.
Albert Wicaksono; Gimoon Jeong; Doosun Kang. Water–Energy–Food Nexus Simulation: An Optimization Approach for Resource Security. Water 2019, 11, 667 .
AMA StyleAlbert Wicaksono, Gimoon Jeong, Doosun Kang. Water–Energy–Food Nexus Simulation: An Optimization Approach for Resource Security. Water. 2019; 11 (4):667.
Chicago/Turabian StyleAlbert Wicaksono; Gimoon Jeong; Doosun Kang. 2019. "Water–Energy–Food Nexus Simulation: An Optimization Approach for Resource Security." Water 11, no. 4: 667.
Gimoon Jeong; Doosun Kang. Erratum for “Revisiting the Resilience Index for Water Distribution Networks” by Gimoon Jeong, Albert Wicaksono, and Doosun Kang. Journal of Water Resources Planning and Management 2019, 145, 08218002 .
AMA StyleGimoon Jeong, Doosun Kang. Erratum for “Revisiting the Resilience Index for Water Distribution Networks” by Gimoon Jeong, Albert Wicaksono, and Doosun Kang. Journal of Water Resources Planning and Management. 2019; 145 (1):08218002.
Chicago/Turabian StyleGimoon Jeong; Doosun Kang. 2019. "Erratum for “Revisiting the Resilience Index for Water Distribution Networks” by Gimoon Jeong, Albert Wicaksono, and Doosun Kang." Journal of Water Resources Planning and Management 145, no. 1: 08218002.
Gimoon Jeong; Doosun Kang. Closure to “Revisiting the Resilience Index for Water Distribution Networks” by Gimoon Jeong, Albert Wicaksono, and Doosun Kang. Journal of Water Resources Planning and Management 2019, 145, 07018010 .
AMA StyleGimoon Jeong, Doosun Kang. Closure to “Revisiting the Resilience Index for Water Distribution Networks” by Gimoon Jeong, Albert Wicaksono, and Doosun Kang. Journal of Water Resources Planning and Management. 2019; 145 (1):07018010.
Chicago/Turabian StyleGimoon Jeong; Doosun Kang. 2019. "Closure to “Revisiting the Resilience Index for Water Distribution Networks” by Gimoon Jeong, Albert Wicaksono, and Doosun Kang." Journal of Water Resources Planning and Management 145, no. 1: 07018010.
Water, energy, and food (WEF) scarcity has been realized as a global issue, and several strategies have been proposed to solve this problem. The WEF Nexus is a novel concept in resources management that integrates and considers feedback connections of water, energy, and food production and consumption in a single framework. The discussion of WEF Nexus commonly involves several parties with different backgrounds and expertise to decide sustainable management plan. This paper introduces a computer simulation model to calculate the supply and consumption, availability, and reliability of water, energy, and food resources on a nationwide scale considering the interconnections of resources. Developed based on a system dynamics algorithm, the Water-Energy-Food Nexus Simulation Model (WEFSiM) simulated the nationwide resources nexus implementing the changes of energy policy in South Korea and capital investment planning of urban water systems in Indonesia. Successfully calculating the reliability index of resources and evaluating the feedback analysis in both case studies, WEFSiM can investigate resource security under plausible future conditions, and stakeholders possibly could utilize it as a decision support tool.
Albert Wicaksono; Doosun Kang. Nationwide simulation of water, energy, and food nexus: Case study in South Korea and Indonesia. Journal of Hydro-environment Research 2018, 22, 70 -87.
AMA StyleAlbert Wicaksono, Doosun Kang. Nationwide simulation of water, energy, and food nexus: Case study in South Korea and Indonesia. Journal of Hydro-environment Research. 2018; 22 ():70-87.
Chicago/Turabian StyleAlbert Wicaksono; Doosun Kang. 2018. "Nationwide simulation of water, energy, and food nexus: Case study in South Korea and Indonesia." Journal of Hydro-environment Research 22, no. : 70-87.
A computer-based simulation model was developed to quantify the seismic damage that may occur in water supply networks and to suggest restoration strategies after such events. The model was designed to produce probabilistic seismic events and determine the structural damage of facilities. Then, the model numerically quantifies the system restoration rate over time by connecting it with a hydraulic analysis solver. The model intends to propose superb restoration plans by performing sensitivity analyses using several restoration scenarios. The developed model was applied to an actual metropolitan waterworks system currently operating in South Korea and successfully suggested the most efficient restoration approaches (given seismic damage) to minimize the complete recovery time and suspension of water service. It is expected that the proposed model can be utilized as a decision-making tool to determine prompt system recovery plans and restoration priorities in the case of an actual seismic hazard that may occur in water supply networks.
Jeongwook Choi; Do Guen Yoo; Doosun Kang. Post-Earthquake Restoration Simulation Model for Water Supply Networks. Sustainability 2018, 10, 3618 .
AMA StyleJeongwook Choi, Do Guen Yoo, Doosun Kang. Post-Earthquake Restoration Simulation Model for Water Supply Networks. Sustainability. 2018; 10 (10):3618.
Chicago/Turabian StyleJeongwook Choi; Do Guen Yoo; Doosun Kang. 2018. "Post-Earthquake Restoration Simulation Model for Water Supply Networks." Sustainability 10, no. 10: 3618.
Ho Min Lee; Do Guen Yoo; Joong Hoon Kim; Doosun Kang. Closure to “Hydraulic Simulation Techniques for Water Distribution Networks to Treat Pressure Deficient Conditions” by Ho Min Lee, Do Guen Yoo, Joong Hoon Kim, and Doosun Kang. Journal of Water Resources Planning and Management 2018, 144, 07017008 .
AMA StyleHo Min Lee, Do Guen Yoo, Joong Hoon Kim, Doosun Kang. Closure to “Hydraulic Simulation Techniques for Water Distribution Networks to Treat Pressure Deficient Conditions” by Ho Min Lee, Do Guen Yoo, Joong Hoon Kim, and Doosun Kang. Journal of Water Resources Planning and Management. 2018; 144 (3):07017008.
Chicago/Turabian StyleHo Min Lee; Do Guen Yoo; Joong Hoon Kim; Doosun Kang. 2018. "Closure to “Hydraulic Simulation Techniques for Water Distribution Networks to Treat Pressure Deficient Conditions” by Ho Min Lee, Do Guen Yoo, Joong Hoon Kim, and Doosun Kang." Journal of Water Resources Planning and Management 144, no. 3: 07017008.