This page has only limited features, please log in for full access.

Dr. Yangho Song
Department of Civil and Environmental Engineering, Hanbat National University,

Basic Info


Research Keywords & Expertise

0 Water Resource Engineering
0 Disaster Mitigation
0 Flood Modelling
0 Hydrological analysis and modeling
0 Civil and environmental Engineering

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 22 October 2020 in Water
Reads 0
Downloads 0

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.

ACS Style

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 Style

Yang 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 Style

Yang 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.

Journal article
Published: 08 May 2020 in Water
Reads 0
Downloads 0

Numerical and empirical studies of soil slurry transport and deposition in urban stormwater sewers are few, presumably due to the difficulty of direct observation of soil slurry flow in stormwater pipes. Slurry in a sewer system includes both suspended load and bedload, but few studies have attempted to demarcate these two components. A boundary layer is a crucial determinant of sediment transport capacity. Stormwater runoff enters the sewer in turbulent flow, mostly mixed with soil slurry generated by rainfall. In this paper, we attempt analysis using ANSYS Fluent commercial CFD software. We describe the development of a numerical analytical methodology capable of predicting the flow of soil slurry in stormwater pipes, and propose a method for estimating the sediment–flow boundary layer. Using this model, we simulated stormwater runoff with a large content of soil slurry during a rainfall event. We investigated soil slurry transport and predict the formation of shear boundary layer by varying the inlet conditions (volume of soil slurry entering the stormwater sewer system) and by analyzing the flow velocity field and soil slurry volume fraction in the pipes under various experimental flow conditions. Based on the shear and settling velocity of sediment particles, we propose criteria for the formation of a shear boundary layer in stormwater pipes.

ACS Style

Yang Ho Song; Jin Gul Joo; Jung Ho Lee; Do Guen Yoo. Numerical Assessment of Shear Boundary Layer Formation in Sewer Systems with Fluid-Sediment Phases. Water 2020, 12, 1332 .

AMA Style

Yang Ho Song, Jin Gul Joo, Jung Ho Lee, Do Guen Yoo. Numerical Assessment of Shear Boundary Layer Formation in Sewer Systems with Fluid-Sediment Phases. Water. 2020; 12 (5):1332.

Chicago/Turabian Style

Yang Ho Song; Jin Gul Joo; Jung Ho Lee; Do Guen Yoo. 2020. "Numerical Assessment of Shear Boundary Layer Formation in Sewer Systems with Fluid-Sediment Phases." Water 12, no. 5: 1332.

Journal article
Published: 01 January 2020 in Sustainability
Reads 0
Downloads 0

Recently, the Republic of Korea has experienced natural disasters, such as typhoons and heavy rainfall, as well as social accidents, such as large-scale accidents and infectious diseases, which are continuously occurring. Despite repeated disasters, problems such as inefficient early response and overlapping command systems occur continuously. In this study, we analyzed the characteristics of disaster management systems by foreign countries, and the status of the damages by disasters for the past 10 years in the Republic of Korea, to suggest possible measures to improve the Republic of Korea’s integrated disaster management system. When a disaster occurs in the Republic of Korea, the Si/Gun/Gu Disaster Safety Measure Headquarters, under the command of the local governments, become the responsible agencies for disaster response while the central government supervises and controls the overall disaster support and disaster management. To improve the current disaster management system, we propose to incorporate all disaster types rather than dividing them by type into natural disasters and social disasters. To improve the disaster response and disaster management system, we propose to restructure the current administrative organization, revise the disaster-related laws, and overcome problems, such as inter-ministerial interconnectivity and overlapping regulation.

ACS Style

Young Seok Song; Moo Jong Park; Jung Ho Lee; Byung Sik Kim; Yang Ho Song. Improvement Measure of Integrated Disaster Management System Considering Disaster Damage Characteristics: Focusing on the Republic of Korea. Sustainability 2020, 12, 340 .

AMA Style

Young Seok Song, Moo Jong Park, Jung Ho Lee, Byung Sik Kim, Yang Ho Song. Improvement Measure of Integrated Disaster Management System Considering Disaster Damage Characteristics: Focusing on the Republic of Korea. Sustainability. 2020; 12 (1):340.

Chicago/Turabian Style

Young Seok Song; Moo Jong Park; Jung Ho Lee; Byung Sik Kim; Yang Ho Song. 2020. "Improvement Measure of Integrated Disaster Management System Considering Disaster Damage Characteristics: Focusing on the Republic of Korea." Sustainability 12, no. 1: 340.

Journal article
Published: 29 July 2019 in Water
Reads 0
Downloads 0

The runoff from heavy rainfall reaches urban streams quickly, causing them to rise rapidly. It is therefore of great importance to provide sufficient lead time for evacuation planning and decision making. An efficient flood forecasting and warning method is crucial for ensuring adequate lead time. With this objective, this paper proposes an analysis method for a flood forecasting and warning system, and establishes the criteria for issuing urban-stream flash flood warnings based on the amount of rainfall to allow sufficient lead time. The proposed methodology is a nonstructural approach to flood prediction and risk reduction. It considers water level fluctuations during a rainfall event and estimates the upstream (alert point) and downstream (confluence) water levels for water level analysis based on the rainfall intensity and duration. We also investigate the rainfall/runoff and flow rate/water level relationships using the Hydrologic Engineering Center’s Hydrologic Modeling System (HEC-HMS) and the HEC’s River Analysis System (HEC-RAS) models, respectively, and estimate the rainfall threshold for issuing flash flood warnings depending on the backwater state based on actual watershed conditions. We present a methodology for issuing flash flood warnings at a critical point by considering the effects of fluctuations in various backwater conditions in real time, which will provide practical support for decision making by disaster protection workers. The results are compared with real-time water level observations of the Dorim Stream. Finally, we verify the validity of the flash flood warning criteria by comparing the predicted values with the observed values and performing validity analysis.

ACS Style

Youngseok Song; Yoonkyung Park; Jungho Lee. Flood Forecasting and Warning System Structures: Procedure and Application to a Small Urban Stream in South Korea. Water 2019, 11, 1571 .

AMA Style

Youngseok Song, Yoonkyung Park, Jungho Lee. Flood Forecasting and Warning System Structures: Procedure and Application to a Small Urban Stream in South Korea. Water. 2019; 11 (8):1571.

Chicago/Turabian Style

Youngseok Song; Yoonkyung Park; Jungho Lee. 2019. "Flood Forecasting and Warning System Structures: Procedure and Application to a Small Urban Stream in South Korea." Water 11, no. 8: 1571.

Journal article
Published: 04 August 2018 in Entropy
Reads 0
Downloads 0

This study proposed a pressure driven entropy method (PDEM) that determines a priority order of pressure gauge locations, which enables the impact of abnormal condition (e.g., pipe failures) to be quantitatively identified in water distribution networks (WDNs). The method developed utilizes the entropy method from information theory and pressure driven analysis (PDA), which is the latest hydraulic analysis method. The conventional hydraulic approach has problems in determining the locations of pressure gauges, attributable to unrealistic results under abnormal conditions (e.g., negative pressure). The proposed method was applied to two benchmark pipe networks and one real pipe network. The priority order for optimal locations was produced, and the result was compared to existing approach. The results of the conventional method show that the pressure reduction difference of each node became so excessive, which resulted in a distorted distribution. However, with the method developed, which considers the connectivity of a system and the influence among nodes based on PDA and entropy method results, pressure gauges can be more realistically and reasonably located.

ACS Style

Do Guen Yoo; Dong Eil Chang; Yang Ho Song; Jung Ho Lee. Optimal Placement of Pressure Gauges for Water Distribution Networks Using Entropy Theory Based on Pressure Dependent Hydraulic Simulation. Entropy 2018, 20, 576 .

AMA Style

Do Guen Yoo, Dong Eil Chang, Yang Ho Song, Jung Ho Lee. Optimal Placement of Pressure Gauges for Water Distribution Networks Using Entropy Theory Based on Pressure Dependent Hydraulic Simulation. Entropy. 2018; 20 (8):576.

Chicago/Turabian Style

Do Guen Yoo; Dong Eil Chang; Yang Ho Song; Jung Ho Lee. 2018. "Optimal Placement of Pressure Gauges for Water Distribution Networks Using Entropy Theory Based on Pressure Dependent Hydraulic Simulation." Entropy 20, no. 8: 576.

Journal article
Published: 24 July 2018 in Water
Reads 0
Downloads 0

Low-impact development (LID) methods are an important approach to storm-water mitigation. Modeling the effects of these installations using rainfall-runoff simulations can provide useful data for future design and implementation. In this study, we used the Storm Water Management Model to assess seven types of LID installations (vegetated areas, garden pots, tree filter boxes, permeable pavement, infiltration ditches, rain barrels, and infiltration blocks) at a South Korean industrial site. Using both short- and long-term simulation periods and distinct sub-basins within the study site, we were able to assess LID performance at the combined watershed, as well as at one LID facility. All LID types showed reasonable performance for storm-water runoff reduction, though rain barrels were the least effective. The effect of rainfall runoff reduction on LID facilities is changed according to rainfall depth (annual precipitation, monthly rainfall), the ratio of drainage area and facility capacity. We concluded that SWMM-LID modeling can effectively support the management of LID installations by providing additional design and planning data to better mitigate the effects of storm-water runoff.

ACS Style

Jungho Kim; Jungho Lee; Yangho Song; Heechan Han; Jingul Joo. Modeling the Runoff Reduction Effect of Low Impact Development Installations in an Industrial Area, South Korea. Water 2018, 10, 967 .

AMA Style

Jungho Kim, Jungho Lee, Yangho Song, Heechan Han, Jingul Joo. Modeling the Runoff Reduction Effect of Low Impact Development Installations in an Industrial Area, South Korea. Water. 2018; 10 (8):967.

Chicago/Turabian Style

Jungho Kim; Jungho Lee; Yangho Song; Heechan Han; Jingul Joo. 2018. "Modeling the Runoff Reduction Effect of Low Impact Development Installations in an Industrial Area, South Korea." Water 10, no. 8: 967.

Journal article
Published: 22 June 2018 in Water
Reads 0
Downloads 0

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.

ACS Style

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 Style

Yang 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 Style

Yang 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.

Journal article
Published: 11 April 2018 in Water
Reads 0
Downloads 0

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.

ACS Style

Yang Ho Song; Rin Yun; Eui Hoon Lee; Jung Ho Lee. Predicting Sedimentation in Urban Sewer Conduits. Water 2018, 10, 462 .

AMA Style

Yang Ho Song, Rin Yun, Eui Hoon Lee, Jung Ho Lee. Predicting Sedimentation in Urban Sewer Conduits. Water. 2018; 10 (4):462.

Chicago/Turabian Style

Yang Ho Song; Rin Yun; Eui Hoon Lee; Jung Ho Lee. 2018. "Predicting Sedimentation in Urban Sewer Conduits." Water 10, no. 4: 462.