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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Korean Society of Hazard Mitigation
Journal Basic Information
Journal DOI :
Korean Society of Hazard Mitigation
Editor in Chief :
Moo Jong Park
Volume & Issues
Volume 13, Issue 6 - Dec 2013
Volume 13, Issue 5 - Oct 2013
Volume 13, Issue 4 - Aug 2013
Volume 13, Issue 3 - Jun 2013
Volume 13, Issue 2 - Apr 2013
Volume 13, Issue 1 - Feb 2013
Selecting the target year
Evaluation of Shear Resisting Capacity of a Conventional Reinforced Concrete Wall with Steel or Polyamide Fiber Reinforcement
Choun, Young-Sun ; Lee, Jang Hwa ; Jeon, Joong Kyu ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 1~7
DOI : 10.9798/KOSHAM.2013.13.3.001
A concrete shear wall system is an ideal structural system that can effectively resist large horizontal cyclic loads such as earthquakes. In particular, a significant increase of the ductility in fiber reinforced concrete shear walls can prevent a brittle failure and thus can enhance seismic resisting capacity significantly. This study investigated the shear resisting capacity of shear wall specimens, which are constructed with steel fibers or polyamide fibers reinforced concrete, by comparing hysteresis curves obtained from reversal cyclic tests. The shear resisting force in the steel fiber reinforced concrete specimen was larger than those in plain and polyamide fiber reinforced concrete specimens, but the increase was not great. The shear resisting capacity of the polyamide fiber reinforced concrete specimen was larger than that of plain concrete specimen, but smaller than that of steel fiber reinforced concrete specimen.
A Study of Safety Evaluation of Korean School Buildings with Deterioration Level
You, Yong-Heum ; Kim, Hyeoung-Jun ; Kim, Jin-Wook ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 9~15
DOI : 10.9798/KOSHAM.2013.13.3.009
The safety of school facility which affects directly health of young students is very important element of government welfare policy. Korean government was supplying with mass production policy to satisfy needs of lack of educational space. There are approximately 60,000 elementary, middle and high school buildings in Korea. One of the most important factors for the safety of school facility is the evaluation of building deterioration and plan of refurnishment and remodeling. To analyze situation of korean school building deterioration, we corrected 11,371 data for school and 63,979 data for school building and analyzed those data with region of site, building type, age of building, type of structure systems and state of safety. And using a deterioration formula, we could estimate number of the schools which need remodeling and reconstruction. As a conclusion, annual base national wide school building future project which need reconstruction and remodeling was estimated to help establish educational facility policy.
Combustion Properties for Tree Species of Major Structural Components of Traditional Wooden Buildings
Lee, Ji-Hee ; Kim, Donghyun ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 17~22
DOI : 10.9798/KOSHAM.2013.13.3.017
The wooden buildings in general are always exposed to the fire risks due to a material properties. In the fire risk assessment and the spread simulation for forest fire or common fires as well as the fires in both living and industrial areas, we will be able to elicit more accurate interpretation and results by applying the values of combustion properties according to materials depending upon the species of the trees. Such a combustion property according to each material can be figured out by means of heat release rate, ignition quality, and combustion weight, etc. After distinguished the tree species of major structural components of wooden buildings, the combustion properties of each tree species were measured making use of the Cone Calorimeter(ISO 5660-1). As the species of the trees for pillars, crossbeams, girders, and other supplementary materials of the wooden buildings, P. denstiflora, A. holophyila, Z. serrata, Q. acutissima were mostly used. Accordingly, we conducted an analysis on the HRR, THR, and TTI, etc. From the results, we learned that there were differences in the combustion properties according to each tree species. And it should be used this database upon combustion properties according to the species of the trees for prediction of forest fire as well as of fire behaviors of traditional wooden buildings.
A Study on the Combustible Materials DATA BASE of a Residential Facilities
Kim, Dong Eun ; Seo, Dong Goo ; Kwon, Young Jin ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 23~28
DOI : 10.9798/KOSHAM.2013.13.3.023
As a result of experimenting 6 loading combustibles in domestic residential facilities by using Furniture Calorimeter, values of 2,391.26 kW were appeared from sofa, 1,891.80 kW from drawer, 1,778.95 kW from mattress, 1,104 kW from chair, 291 kW from desk, and 135.09 kW from TV. Also, if applying
value of fire growing rate by classifying fire- growing speeds at NFPA 72 (National Fire Alarm Code 2007, Annex B), mattress can be defined as Ultra-Fast, sofa and drawer Fast, TV Slow, desk Slow, and chair Medium.
An Experimental Study on the Compressive Strength and Chloride Ion Permeability of Concrete with Dredged Materials
Oh, Hongseob ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 29~36
DOI : 10.9798/KOSHAM.2013.13.3.029
Recently the dredged soil steadily increased due to the expansion and maintenance of harbour, but indirect environmental contamination problem might be raised because the most of dredged soil are dumped at the ocean or used as a backfill material. An utilization of dredged soil as a substitution material of fine aggregate were evaluated experimentally, but it is difficult to generalize the material characteristic of dredged soil depending on the harbor location and seabed ground. Compressive strength test and chloride ion penetration test on the concrete in which two different dredged soils composed with silty sand and inorganic silt, respectively, are used as a substitution material of fine aggregate, are performed. The volume fraction of dredge soil and slag, and cement type are selected as experimental variables. From the test, the 28-day compressive strength of concrete mixed dredged was lower than normal concrete, while the 90-day strength is slightly higher than the normal concrete. The total passed charge of concrete with dredged soil is similar or slightly smaller than it of normal concrete.
Development of Flood Nomograph for Inundation Forecasting in Urban Districts
Jo, Deok Jun ; Jeon, Byeong Hoon ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 37~42
DOI : 10.9798/KOSHAM.2013.13.3.037
The heavy flood has been increased due to the climate change from global warming and accelerated urbanization. The urban basin have the high impermeability, short concentration time and increased storms brings serious flooding damage. Therefore the flood prediction system is required for the forecast of urban inundation to reduce property damage and injury to people. In this study, Flood Nomograph(F-N) is developed to forecast only with rainfall information at a selected urban district with high inundation possibility. This study showed the applicability of Flood Nomograph for real-time forecast flooding according to rainfall intensity and rainfall duration effectively and verified by urban runoff model.
Establishment of Landslide Rainfall Threshold for Risk Assessment in Gangwon Area
Oh, Jeongrim ; Park, Hyuck Jin ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 43~51
DOI : 10.9798/KOSHAM.2013.13.3.043
Most of the slope failures and debris flows occur due to seasonal rain and typhoon in Korea. Rainfall is very important factors induced by the landslides. To study the establishment of landslide rainfall thresholds, the data of rainfall and landslides are investigated and analyzed. Landslide rainfall thresholds on landslide assessment are based on an empirical approach. It assumes that an area which experienced landslides with specific rainfall characteristics will experience similar landslides when similar rainfalls occur. If rainfall characteristics in a specific area can be observed in real time, it is possible to occur the landslide. The analyses focused on 50 historical landslide events and rainfall data. These data are analyzed to know the relationship the rainfall intensityduration and landslides. The landslide rainfall thresholds using historical data are very effective method to predict the burst time of landslides.
Stability of Concrete Track above the Substructure Constructed by Non-opencut Method
Choi, Won Il ; Baek, Chang Jin ; Park, Seung Hwan ; Cho, Kook Hwan ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 53~59
DOI : 10.9798/KOSHAM.2013.13.3.053
As the development of around railway area, the subsurface construction using non-opencut method under the railway has been recently increased. When the structure under railway is constructed, the track support stiffness of the ground is not considered as an important design factor. In this study, laboratory tests were performed to investigate the ground movement characteristics nearby the subsurface structure. Based on the laboratory test results, 3D numerical analyses were performed to find out the dynamic characteristics of the concrete track. The numerical analyses results showed that displacements above the structure were varied with the soil thickness. When soil thickness is 3m, tensile stress of the results was less than allowable tensile stress. However, when the soil thickness are 1m and 2m, concrete tensile stress on the concrete track exceeds the allowable tensile stress.
A Study on the Evacuation Route of Areas Prone to Floods Using Disaggregate Behavioral Model
Kim, Jooyoung ; Yu, Yeonseung ; Lee, Seungjae ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 61~67
DOI : 10.9798/KOSHAM.2013.13.3.061
Recently, a research on development of evacuation route system is being carried out to handle the natural disaster occurring due to increasing weather abnormality. This paper deals with a methodology for searching evacuation route and effective traffic operation when roads areas are prone to floods. The methodology is that we made activity based model by using household travel survey data and then modeling it by applying a flooding scenario in traffic demand analysis program, MATSim in Ssinwol-dong, Kangseo-Gu, Seoul. Therefore, analysis of the result shows that travel pattern can be known in worst scenario cases. And it will be used effectively in decision making for evacuation route or efficient urban road operation when road area is prone to flood, or flooded.
The Impact of Emotional Exhaustion and Physical Symptoms in about Rescue Workers Incident Shock
Yoo, Eui-Tae ; Cho, Sung-Je ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 69~75
DOI : 10.9798/KOSHAM.2013.13.3.069
This study was designed to analyze the extent of incident shock impact on emotional exhaustion and physical symptoms. The subjects were 415 rescue workers in Seoul Metropolitan Fire and Disaster Headquarters. Questionnaire consisted of 20 sociodemographic questions, 22 incident shock scale and emotional exhaustion scale and 20 physical symptoms scale. Empirical analysis was verified at the 5% significance level and for SPSSWIN 18.0 program was used for processing statistics. With high reliabilities, the extent of incident shock was Cronbach`s
A Study on the Consciousness of Fire-fighting Officers for the Establishment of Safety Measures for Wooden Cultural Assets
Shin, Ho-Joon ; Beak, Min-Ho ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 77~81
DOI : 10.9798/KOSHAM.2013.13.3.077
Cases in which wooden architectural cultural assets caught on fire, and the likeliness of such structures to catch on fire, were reviewed in order to establish safety measures for the protection of wooden cultural assets and important items, and the necessity for establishing such safety measures, based on a consciousness survey of officers specialized in fire-fighting. Through this study, fire fighting safety measures in consideration of disaster occurrence were prepared and the developmental plans for the safety management and future protection of wooden architectural cultural assets was presented.
Temporal and Spatial Characteristics Analysis of Rainfall in Seoul
Son, Ahlong ; Han, Kunyeon ; Bae, Sunghwan ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 83~95
DOI : 10.9798/KOSHAM.2013.13.3.083
In this study, kriging and moving average method were applied in order to comprehend temporal and spatial characteristics of rainfall in Seoul area. Errors were estimated depending on weights of weighted moving average model and exponential moving average model for analyzing temporal characteristics of rainfall. According to the results of the analysis of rainfall database of the Seoul Meteorology Station and AWS(Automatic Weather Station) by using the weighted moving average model having minimum errors, rainfall was concentrated in the summer months except for the rainy season and tend to increase the total amount of rainfall. The kriging was applied for analyzing spatial characteristics of rainfall and the spherical model well depicted spatial distribution of urban heavy rain in target area. And parameters were calculated and analyzed in accordance with rainfall intensity. The result show area-averaged rainfall using kriging reduced risk of overestimation of area-averaged rainfall using Thiessen weighting method.
Effect analysis for Maintenance Project on Natural Disaster Prone Areas Using Quantitative and Qualitative analyses
Heo, Bo Young ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 97~105
DOI : 10.9798/KOSHAM.2013.13.3.097
In this study, the effect analysis of the Maintenance Project on Natural Disaster Prone Areas was analysed quantitatively as well as qualitatively in order to improve the quality of the project. The result obtained from this analysis is used as fundamental data to acquire the continuous and stable budget status. In order to analyze the effectiveness of rehabilitation projects of natural disaster risk districts, the cases of effectiveness analysis of similar projects at home and abroad were investigated, and based on this, the methods of effectiveness analysis on rehabilitation projects were presented. The effectiveness analysis was divided roughly into the quantitative analysis and the qualitative analysis. The quantitative analysis utilized the cost-benefit analysis, and the qualitative analysis conducted the analysis through the questionnaire survey on (1) the degree of satisfaction and (2) the damage reduction effectiveness before and after the rehabilitation projects, and (3) the validity analysis through, besides the results of descriptive statistical analysis generally obtained by questionnaire survey, the structural equation model used in the policy evaluation of agriculture, forestry, and fishery industry projects, which are the public projects similar to the rehabilitation projects of natural disaster risk districts. The results of the analysis showed that, in the quantitative analysis, the cost-benefit analysis ratio was more than 1, and also in the qualitative analysis, the effectiveness of the projects was positively perceived. The results of such analysis are expected to contribute to securing the budget for the rehabilitation projects and to be utilized to establish the direction of efficiently promoting the rehabilitation projects going forward.
A Comparative Case Study of Dam Construction Conflicts in Terms of Policy Perceptual Framing: Hantan River and Dong River Dams
Kim, Youngju ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 107~114
DOI : 10.9798/KOSHAM.2013.13.3.107
The aim of this research is to extract the factors for successful conflict resolution by analyzing the multi-stakeholders` perceptual framing and the course of conflicts in the context of dam construction as one of the measures of disaster mitigation. The author examined the stakeholder, perceptual framing and conflict resolution mechanism of the conflict in the process of constructing Hantan River and Dong River dams. Comparative analysis of the course of conflicts and their settlements in two cases was also conducted. The results suggest that the personnel in-charge 1) facilitate ADR, 2) go through joint-fact finding process 3) expand NGO participation in policy making and coordinate inter-agency, 4) create a standard manual of conflict in the context of disaster for a successful completion of the relevant projects in the future.
A Study on the Actual Condition of External Fire-Fighting Environment for Important Wooden Cultural Assets
Shin, Ho-Joon ; Beak, Min-Ho ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 115~121
DOI : 10.9798/KOSHAM.2013.13.3.115
The designation status, general aspects and fire characteristics of 159 important wooden cultural assets designated as national treasurers were reviewed in this study. And, the access roads for fire trucks, mobilization time and distance of fire trucks, and establishment status of fire trees and fire lines among the external fire-fighting environmental elements surrounding the important wooden cultural assets were analyzed through the actual condition survey of important wooden cultural assets to draw any existing problems. Through this study, the improvement schemes for fire-fighting measures in future were presented.
Mitigation of Blast Pressure according to the Variation of Density and Thickness of the Water Gel
Jung, Woo-Jin ; Nagai, Hiroshi ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 123~130
DOI : 10.9798/KOSHAM.2013.13.3.123
The test blast was carried out in order to investigate the mitigation effect of blast pressure by the water gel for a barrier material at close range from TNT explosive. The mitigation effects of the blast pressure by changing the density and thickness of the water gel were verified. At close range from TNT explosive, as the low scaled distance, the mitigation effect of the peak overpressure by water gel was greater than that of the high scaled distance, and decreased with increasing the scaled distance. Furthermore, the mitigation degree of the scaled impulse by changing the density and thickness of water gel showed the same trend as the peak overpressure.
The Study on the Viewshed Analysis and the Estimation of Proper Number of Forest Fire Surveillance Cameras (Focusing on Samcheok-Si)
Kang, Sung-Chul ; Lee, Si-Young ; Lee, Byungdoo ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 131~137
DOI : 10.9798/KOSHAM.2013.13.3.131
This study suggested the proper number of the forest fire surveillance cameras. The visualities and effectiveness of surveillance cameras were analyzed according to basic administrative units in Samcheok City. First, we assessed the visual range and effectiveness of each surveillance camera. The results showed that visibility of the seventh surveillance camera was narrow and overlapped because of short distance from other camera. Consequently, The results of these analysis shows that the cameras which had a poor visual range located must be relocated in area where that had a high visual range. As new surveillance cameras are installed in this region, the location of these would have to be considered by these conditions; the overlapping of visibility with other cameras or other organizations, the adequacy of its location, etc. And over 32 surveillance camera would be need for the most effective monitoring in Samcheok City. These results would be utilized for improving an efficiency of surveillance camera and forest fire management techniques.
A Study on Measures to Minimize Errors in the Judgment of Fire Causes
Lee, Eui-Pyeong ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 139~146
DOI : 10.9798/KOSHAM.2013.13.3.139
When fires occur, fire investigators judge fire causes based on fire investigation. However, sometimes wrong judgment is made. In this paper, six examples of erring in the judgment of fire causes due to investigators` poor investigation rather than damage of fire scenes or evidences are analyzed. And, measures to minimize errors in the judgment of fire causes were suggested as follows. 1) Provide professional fire investigator programs, 2) introduce a restriction system of making a report only by qualified fire investigators, 3) prepare investigation standards for fires or explosions far beyond investigator`s capacity, 4) sublate the judgment of fire causes without scene investigation or excavation, 5) ensure evidences early and preserve fire scenes carefully, 6) generally examine eyewitness evidence, CCTV records, mechanical security status, findings of fire scene investigation, identification results, and appraisal results to judge fire causes, and 7) pick out examples of erring in the judgement of fire causes and use them for educational materials for recurrence prevention.
Estimation of Future Design Rainfalls in Administrative Districts Using Nonstationary GEV Model
Shin, Ji Yae ; Park, Yei Jun ; Kim, Tae-Woong ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 147~156
DOI : 10.9798/KOSHAM.2013.13.3.147
In South Korea, stationary frequency analysis methods are generally used for estimating design rainfalls in practice. However, due to climate change and/or variability, recent rainfall observations have significantly different patterns from the past so that the recent trends need to be considered to estimate extreme rainfall quantiles for hydrologic design. This study focused on estimating extreme rainfall quantiles in administrative districts across South Korea, after building nonstationary GEV model using annual maximum rainfall (AMR) datasets for 228 administrative districts from point rainfall measures from 1973 to 2012. A moving average method with 25-year window was used for investigating time-dependent statistics of AMR, such as mean, variance and skewness, and parameters of GEV distribution. From the analyses of relationships between statistics and distribution parameters, this study derived nonlinear regression equations for distribution parameters, which provide the estimates of distribution parameters at any future time. The overall results achieved in this study illustrate that the nonlinear regression equations can be easily incorporated into the hydrologic frequency analysis and provide appropriate estimates of design rainfalls in the near future.
The Study of Bed Change and Stability Depending on Hydraulic Structure
Son, Ahlong ; Han, Kunyeon ; Kwon, Takhoon ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 157~166
DOI : 10.9798/KOSHAM.2013.13.3.157
In terms of river planning and management, it is very important to predict and analyze the effect of long-term variation of river bed led by artificial changes in the materials of river regime and river bed. The country`s studies on the prediction of river bed variation, mostly using one-dimensional model, can not consider the meandering course of the river or similar transverse distribution, and they suitable for application in case of local change in the river flow. The thesis targeting real rivers implemented simulations and made a comparative analysis using CCHE2D model that is a numerical model for two-dimensional flow and river bed variation. To verify the validity of the model, the area was selected between Ilseongyo in Nakdong River and Waegwan water level observatory as a real natural river in which the simulations were conducted according to the frequency of 50 years, 100 years, 200 years at Chilgokbo. The results of this analysis presented that sedimentation highly increased in the area except for right lower reach and show that a great quantity of erosion happen for right lower reach. Because continuous erosion lead to serious problem like weir being washed, stability of measures against erosion like bed pitching was reviewed according to tractive force and the result show that the measures are stable.
Analysis of Curved-Channel Characteristics on Sloping Drop Structure Using Hydraulic Model Experiments
Park, Moojong ; Woo, Jaeyoung ; Lee, Joungho ; Song, Youngseok ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 167~175
DOI : 10.9798/KOSHAM.2013.13.3.167
Hydraulic Structure are inevitably set up and operated in the river that flow characteristics are complex. When designing the water surface elevation and velocity by using 1-D Hydraulic Model, it will not be able to reflect the characteristics of Lateral Eddy and Superelevation due to centrifugal force. This study compared with result of 1-D Hydraulic Model and Hydraulic Model Experiments, Through the model experiment of Sloping Drop Structure installed on Curved-Channel. Hydraulic Model was constructed to baekseok bridge and Shinchun Bridge about 210 m interval located in Uijeongbu, Gyeonggi-do. Result of Hydraulic Modeling observed data and 1-D Hydraulic Modeling date are compared to design flood 100 year and 20 year. Result of experiments are depth ovserved data 35~48% low then 1-D Hydraulic Modeling date and velocity ovserved data 135~167% large then 1-D Hydraulic Modeling date. Research reaults expect to basic information for Curved-Channel Characteristics on Sloping Drop Structure.
Analysis of the Characteristic of Monthly Rainfall Erosivity in Korea with Derivation of Rainfall Energy Equation
Lee, Jong Seol ; Won, Jin Young ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 177~184
DOI : 10.9798/KOSHAM.2013.13.3.177
The Rainfall kinetic energy equation derived in United States has been used or the result of rainfall erosivity factor using this equation has been applied for soil erosion estimation in the field. But the rainfall energy equation depends on the characteristic of observed location. So, in this study the correlation equation between rainfall intensity and rainfall energy was proposed using raindrop distribution data measured at Daegwanryeong observatory. Also monthly rainfall erosivity factors of 76 observatories were estimated with different rainfall energy equation considering the seasonal rainfall characteristic. And the monthly rainfall erosivity factor maps were conducted using the values of rainfall erosivity factors for the estimation of monthly soil erosion.
A Study on Three Dimensional Expression of River Bed Cross Section Considering Surrounding Topography
Jeong, Changsam ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 185~190
DOI : 10.9798/KOSHAM.2013.13.3.185
Recently the environmental change in river such as channel dredging and weir operation caused by climate change and large scale national project should affect hydraulic and hydrological phenomena. Therefore, study for topographical change and operation/ maintenance of facilities in river is necessary. In this study, the method of three dimensional (3D) expression of river bed was proposed using detailed measurement in section with the advanced technique. The remote controlled boat called River Robot for Velocity and Volume (R2V2) was used to measure the detailed measurement. A remote controlled boat R2V2 equipped with ADCP and RTK GPS were integrated to measure bottom geometry, velocity profile, and river discharge simultaneously. Therefore, if river bed is expressed in 3D based on this study, it is possible to plan considering surrounding and river topography when planning of river transverse facilities or structures in river.
Evaluation of Influence of Climate Variation on Typhoon-Induced Hydrologic Extremes: Focused on Five Major Basins in South Korea
Lee, Min Woo ; Shin, Ji Yae ; Kim, Tae-Woong ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 191~200
DOI : 10.9798/KOSHAM.2013.13.3.191
In this study, the influence of climate variation on typhoon-induced rainfall and streamflow was analyzed across South Korea by applying Climate Influence Index (CII). The CII represents an increase of the severity of extreme hydrologic event through evaluating the Influence Intensity (II) and the Influence Frequency (IF). Among eight climate indices which were preliminarily investigated, Arctic Oscillation (AO) (in July) and West Pacific Pattern (WP) (in August and September) were selected in this study as appropriate climate indices based on correlation analysis. The influence of selected climate indices on the typhoon-induced rainfall and streamflow was evaluated in 113 sub-basins. Results show specific regional features in the variation of typhoon-induced rainfall and streamflow in July, August and September. Typhoon-induced rainfall and streamflow have a decrease influence in high phase and an increase influence in low phase. Also, the climate influence index is closely related with the correlation coefficient between typhoon-induced hydrologic extremes and climate indices.
Prediction of Maximum Inundation Area with a Hydrodynamic Pressure
Lee, Jin Woo ; Han, Sejong ; Cho, Yong-Sik ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 201~207
DOI : 10.9798/KOSHAM.2013.13.3.201
Predicted maximum inundation area with a three-dimensional hydrodynamic pressure model is developed in this study. Recently, the tsunami disaster is increasingly interested due to the East Japan Tsunami. The numerical model is composed of propagation model and inundation model. For the predicted inundation area, hydrodynamic pressure model is employed. Predicted maximum inundation area at Imwon port is calculated for 3 historical tsunamis and 11 virtual tsunamis. When dealing with tsunami disaster, the produced maximum inundation area can be utilized.
Resonant Reflection by Sinusoidally Varying Topography with Various Shear Currents
Lee, Jun-Whan ; Seo, Kyu Hak ; Cho, Yong-Sik ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 209~214
DOI : 10.9798/KOSHAM.2013.13.3.209
The resonant reflection caused by sinusoidally varying submerged structure and wave could protect coastal facilities from wave attack by reducing wave energy. Water waves deform by not only bottom topography but also interaction with shear currents. In this study, a resonant reflection by a sinusoidally varying topography with various shear currents is investigated. The water depth and the slope of shear currents are represented by a finite number of tiny steps. The proper numbers of steps are proposed and the effects of evanescent modes are shown.
Key Technologies for Construction of Seabed Base
Han, Taek Hee ; Yi, Jin-Hak ; Han, Sang-Hun ; Won, Deokhee ; Park, Woo-Sun ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 215~225
DOI : 10.9798/KOSHAM.2013.13.3.215
By the exhaustion of natural resources and the aggravation of the food situation, many countries are going ahead with development of the ocean space and ocean resources. To expand the border of human life, it is necessary to develop the underwater space. To perform these objectives, it is required to construct and secure a seabed base. The construction of a seabed base will also be the motive power for economy growth in the future. The key technologies to construct a seabed base under high pressure and low temperature conditions are the extreme engineering technologies and they are some parts of space engineering. They are also key technologies to survive when a worldwide-huge disaster attacks the earth. In this study, the necessary technologies for the construction of seabed base were surveyed. And the surveyed technologies were categorized by phase 1 and phase 2, which were defined by construction depth and size, and possible time. The surveyed results showed that it is necessary to construct a seabed base and develop a new constructional material and energy supplying method.
Comparison and Analysis for Water Quality Improvement Alternatives of the Seonakdonggang
Kang, Taeuk ; Lee, Sangho ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 227~237
DOI : 10.9798/KOSHAM.2013.13.3.227
The water in the Seonakdonggang is commonly stagnant by the gates located on the upstream and downstream ends. The water quality of that river is degraded. The purpose of the study is to quantitatively evaluate alternatives for water quality improvement of the Seonakdonggang. We simulated flow rate and water quality for tributaries and main stream of the Seonakdonggang. The SWMM (storm water management model) was used to simulate the flow rate and water quality for the tributaries of the Seonakdonggang and an artificial neural network was employed to estimate chlorophyll-a and dissolved oxygen as it is difficult to simulate them for their tributaries by the SWMM. WASP (water quality analysis simulation program) was used to simulate water quality of the Seonakdonggang. All the models were calibrated with observed data. Alternatives for water quality improvement of the Seonakdonggang are reduction of pollution load from the tributaries, constant water supply for instream flow by operation of the gates, and dredging of the river bed. The assessment results showed that constant water supply by operation of the gates is the most effective for water quality improvement of the Seonakdonggang.
Development of Hydrologic Forecasting Model Connected with Real Time Watershed and River Monitoring System
Kim, Mi-Eun ; Jang, Young-Su ; Kang, Bong-Gwon ; Shin, Hyun-Suk ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 239~245
DOI : 10.9798/KOSHAM.2013.13.3.239
In recent, abnormal phenomena in nature occurs due to climate change, which result in increase of flood frequency and rainfall intensity by change of meteorologic and hydrological factors. Especially, flood inundation in urban watershed frequently happens on casualties expected and property damage. Scientific and technological adaptation are acutely needed for unexpected damage in nature, and that, it is considerably important to develop proper model of hydrological forecasting over the short periods and to build a real-time watershed monitoring system. One of important things for solving a variety of problems is to connect real-time watershed monitoring system with short term hydrologic forecasting model. In this research, Suyoung stream in Busan was determined as a study area. After that, real-time watershed monitoring system at ten minute interval has been established for flood warning and forecast in the field. The data from this system was applied to short-term hydrologic forecasting model based on the artificial neural network. When flood happens in urban, input data of forecasting model on each rainfall event was used. In conclusion, after establishing the model being possible to forecast water level from 10 to 60 minutes at 10 minute interval, as a result of simulating the model, the model performances are considerably good as RMSE 0.02~0.6 and
more than 0.9. It makes possible effectively to manage the watershed in urban.
Effect of Activation of Soil Microbes on Electromigration according to the Characteristics of the Media of Pb and Cu by Bio-electrokinetics
Kim, Hong Tae ; Lee, Tae Ryong ;
Journal of Korean Society of Hazard Mitigation, volume 13, issue 3, 2013, Pages 247~251
DOI : 10.9798/KOSHAM.2013.13.3.247
Electrokinetic has been considered a promising technology to remediate soils contaminated with toxic heavy metals. Several modifications have been studied to improve the remediation processes. In this study, bio-electrokinetic(BEK) process which stands for electrokinetic process combinded with activated soil bacteria was proposed and environmentally evaluated for enhancement of Pb and Cu migration rates by using culture media solution instead of the electrolyte solution. Five different types of the solutions for each phases were used at different culture media and electrolyte ratios (v/v) with 1:0, 0:1, 3:1, 1:1 and 1:3 for phase 1, 2, 3, 4 and 5, respectively. In addition, experiments were conducted for the ratios between soil microbes and electrolyte at 90% and 80%. In the experiments using electrolyte of containing
, the concentrations of leed and copper in the soil at section-1 is relatively lower than that of section-6 since heavy metal components moves from the cathode electrode to the anode electrode. Also the migration rate of lead and copper is high at phase 3. In the experiments using electrolyte of containing
, the migration rate of lead and copper is relatively lower than that of using electrolyte of containing
. Overall results demonstrated that the heavy metal removal efficiency using electrolyte of containing
is higher than that of using electrolyte of containing