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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 7, Issue 5 - Dec 2007
Volume 7, Issue 4 - Oct 2007
Volume 7, Issue 3 - Aug 2007
Volume 7, Issue 2 - Jun 2007
Volume 7, Issue 1 - Mar 2007
Selecting the target year
Damage Estimation of Steel Bridge Members by Fatigue Vulnerability Curves Considering Deterioration due to Corrosion with Time
Kim, Hyo-Jin ; Lee, Hyeong-Cheol ; Jun, Suk-Ky ; Lee, Sang-Ho ;
Journal of Korean Society of Hazard Mitigation, volume 7, issue 4, 2007, Pages 1~12
A method for assessing fatigue vulnerability of steel bridge members considering corrosion and truck traffic variation with time is proposed to evaluate the reduction of fatigue strength in steel bridge members. A fatigue limit state function including corrosion and traffic variation effect is established. The interaction between the average corrosion depth and the fatigue strength reduction factor is applied to the limit state function as the reduction term of strength. Three types of truck traffic change is modeled for representing real traffic change trend. Monte-Carlo simulation method is used for reliability analysis which provides the data to obtain fatigue vulnerability curves. The estimation method proposed was verified by comparing with the results of reference study and applying to the steel bridges in service.
A Study on the Improvement of Durability Design of Underground RC Structures
Im, Jung-Soon ; Bahng, Yun-Suk ;
Journal of Korean Society of Hazard Mitigation, volume 7, issue 4, 2007, Pages 13~18
The research was performed to review the design factors which affect the durability of structures. For the study, domestic and foreign literature review were performed on various design criteria. Based on Korean standard specifications, the results showed that the durability of structure as the diameter of reinforcing steel bar becomes smaller and the distance between reinforcing bar is closer than the normal gap. The results were also presented that the minimum required bar cover is 6.6cm to obtain the durability index value. In addition, the maximum limited bar cover was 12cm considering the durability index and the change of increasing value of durability index. In case that there is no specified regulation for the bar cover thickness change, the durability life by neutralization is proportional to the thickness of bar cover.
Evaluation of Ground-Truth Results of Radar Rainfall Depending on Rain-Gauge Data
Kim, Byoung-Soo ; Kim, Kyoung-Jun ; Yoo, Chul-Sang ;
Journal of Korean Society of Hazard Mitigation, volume 7, issue 4, 2007, Pages 19~29
This study compares various ground-truth designs of radar rainfall using rain-gauge data sets from Korea Meteorological Administration (KMA), AWS and Ministry of Construction and Transportation (MOCT). These Rain-gauge data sets and the Mt. Gwanak radar rainfall data for the same period were compared, and then the differences between two observed rainfall were evaluated with respect to the amount of bias. Additionally this study investigated possible differences in bias due to different storm characteristics. The application results showed no distinct differences between biases from three rain-gauge data sets, but some differences in their statistical characteristics. In overall, the design bias from MOCT was estimated to be the smallest among the three rain-gauge data sets. Among three storm events considered, the jangma with the highest spatial intermittency showed the smallest bias.
An Analysis of Disaster Mythology
Kim, Man-Jae ;
Journal of Korean Society of Hazard Mitigation, volume 7, issue 4, 2007, Pages 31~39
Disaster mythology is "beliefs about human behavior in disaster that have been proven to be wrong through scientifically conducted research studies." Disaster researchers have discovered a series of disaster myths. The results of research survey based on 491 individuals confirm prior research representing widespread belief in disaster mythology such as panic, looting, crime, evacuation and lethargy. This study also indicates that, while high, the percentage of local government officials demonstrating belief in disaster myths was lower than the public except for looting. The probability of believing disaster myths was greater for individuals who were female (panic and evacuation), old (evacuation and lethargy), in their twenties and thirties (looting), and officials with disaster related work experience (panic, looting and crime). The results indicate the importance of understanding public belief to make effective emergency plans.
The Study of Regional Economic Effect by Construction of 119 Integrated Information System through RAS Method -In the Case Gyangsngnamdo-
Ryu, Tae-Chang ; Kim, Yeong ;
Journal of Korean Society of Hazard Mitigation, volume 7, issue 4, 2007, Pages 41~49
This study aims to examine the ripple effect of the '119 Integrated Information System' for city disaster management on the local economy. The study was conducted in the area of Gyeongnam province, and the study method is the interdependence analysis based on the Input Coefficient drawn from Input-Output Tables in which Intermediary Transaction Tables drawn through RAS was taken advantage of to grasp the correlation among industries and regions in terms of the local economy, and the ripple effect of the changes of political exogenous variables on the local economy was divided to such elements as production, added value, and employment so as to attempt empirical analysis on the local economy system. To estimate the ripple effect on the local economy, three different amounts of the expected input were applied to the study respectively and the results are as follows: Some
billion won for the production induction effect, some
billion won for the added-value induction effect, some
job openings for the employment induction effect, and some
billion won for the income induction effect are expected to take place as the ripple effect on the local economy.
Analysis of Flow in the Spillway of Flood Control Reservoir Using CFD Model
Lee, Ho-Jin ; An, Sang-Do ; Jun, Kye-Won ; Son, Yong-Koo ;
Journal of Korean Society of Hazard Mitigation, volume 7, issue 4, 2007, Pages 51~57
In this study, the flow in the spillway of Gun-nam flood control reservoir were simulated by using FLOW-3D model. The discharge in the overflow weir and flow stability in approach channel were investigated with the original design plan. The results show that the scale of spillway is unsuitable and the flow in approach channel is unstable. To solve this problem, therefore, the alternative design plan were formulated. The flow in the spillway were simulated with the alternative design plan. The results show that the scale of spillway is suitable and the flow in approach channel is stable.
Flood Damage Estimation causing Backwater due to the Blockage by Debris in the Bridges
Kim, Soo-Jun ; Chung, Jae-Hak ; Lee, Jong-Seol ; Kim, Ji-Tae ;
Journal of Korean Society of Hazard Mitigation, volume 7, issue 4, 2007, Pages 59~66
The bridge crossing river is the one of the major factors causing backwater level rising. Furthermore, the bridges in the mountainous areas increase the flood damage in the upstream of the bridge due to the blockage by debris. In this research, the effects of debris to the magnitude of flood damage in the study river basin were simulated by using HEC-RAS and HEC-GeoRAS models. With assumption that the backwater caused by debris blocking the space between bridge piers is the only factor causing inundation, the unsteady flow simulation was carried out with various case studies. The potential inundation area with the overflow locations and volumes could be estimated as the results of simulation. However, the simulation results also reveal the limitations of inaccurate estimation of inundation area and depth. To overcome these hindrances, DEM and satellite images were applied to the simulation. By readjusting the inundation area using digital maps and satellite images and calibrating overflow volume and depth using DEM, the accuracy of simulation could be increased resulting more accurate flood damage estimation.
Study on Improved Method for Calculating Runoff Coefficient of Rational Method
Lee, Young-Dai ; Kim, Jong-Soon ; Kim, Young-Teak ;
Journal of Korean Society of Hazard Mitigation, volume 7, issue 4, 2007, Pages 67~74
Rational method has been widely used to calculate peak runoff drainage design or small watershed because of simplicity and convenience. Runoff coefficient(C) is the most important parameter in the rational method which varies according to rainfall intensity, return period, rainfall duration time and soil characteristics. In practice, constant which is value of C in rational formula has been used from the table, originally based on ASCE. These table value does not consider the upper conditions of the depending factors, hence peak runoff calculation could be in correct. Therefore to calculate C in this paper we have devised an improved formula, considering relationship with rainfall duration, return period and CN of NRCS method. This formula is considered to be more reliable and helpful to the hydrologists and engineers to predict correct peak runoff.
Urban Inundation Analysis using the Integrated Model of MOUSE and MIKE21
Choi, Gye-Woon ; Lee, Ho-Sun ; Lee, So-Young ;
Journal of Korean Society of Hazard Mitigation, volume 7, issue 4, 2007, Pages 75~83
Urbanized area has complex terrain with many flow paths. Almost stormwater is drained through pipe network because most area is impervious. And overland flow from the pipe network reform the surface flow. Therefore, it should be considered the drainage system and surface runoff both in urban inundation analysis. It is analyzed by using MIKE FLOOD integrated 1 dimension - 2 dimension model about Incheon Gyo urbanized watershed and compared with the results of 1 dimension model and 2 dimension model. At the result this approach linking of 2 dimension and 1 dimension pipe hydraulic model in MIKE FLOOD give accuracy that offers substantial improvement over earlier approach and more information about inundation such as water dapth, velocity or risk of flood, because it is possible to present storage of overland flow and topographical characteristic of area.
An Experimental Study on Runoff Reducing Effect of Infiltration-Storage System due to Rainfall Intensity
Song, Jai-Woo ; Im, Jang-Hyuk ;
Journal of Korean Society of Hazard Mitigation, volume 7, issue 4, 2007, Pages 85~95
The variation of hydraulic and hydrologic aspect of urban area according to the strongly seasonal variation of rainfall and the increment of urbanization has caused the runoff variation and increased the flood damage, and thus made a difficulty to manage water resources in urban area. Recently, as a part of efforts to resolve these problems, the facilities for reducing runoff increasing due to urbanization have a tendency to install in our country. In this study, more effective Infiltration-Storage System(ISS) is proposed and its reducing effect is analyzed by hydraulic experimental study. The infiltration characteristics of runoff reduction facilities are examined as varying artificial rainfall and a material of infiltration layers being able to consider the influence of urban development. As a result of comparison of infiltration rate of the upper and lower parts, the infiltration rate in the lower part is larger than that of the upper part. Thus, the ISS is more available than existing runoff reduction facilities. Results obtained in this study can be provided fundamental data for improvement of existing runoff reduction facilities and practical use of ISS.
Field survey of 1983 central East Sea Tsunami : Imwon Port
Kim, Sung-Min ; Lee, Seung-Oh ; Choi, Moon-Kyu ; Cho, Yong-Sik ;
Journal of Korean Society of Hazard Mitigation, volume 7, issue 4, 2007, Pages 97~105
This study has been focus to certify the run-up heights, losses of human lives and property damages due to the 1983 Central East Sea tsunami. We have conducted the interview with indigenous inhabitant and field surveying at the Imwon port, East sea in Korea in order to inquire into the state of things occurred during that period. It is also investigated how much well they are aware of the emergency action plan including the evacuation system. Base on the reliable interviews, we selected and surveyed 10 places at the Imwon port, where the historical maximum overflowing occurred due to the 1983 Central East Sea tsunami. The measured run-up heights are approximately
at the selected 10 places and it is found that the sea water ran over the banks in Imwon stream about 700m upstream from the Imwon port. From this study we can suggest supplementing the present emergency action plan and supply the state-of-the-art inundation map.
Effect of Stormwater Runoff on Combined Sewer Overflows in Korea
Kim, Lee-Hyung ; Kim, Il-Kyu ; Lee, Young-Sin ; Lim, Kyeong-Ho ;
Journal of Korean Society of Hazard Mitigation, volume 7, issue 4, 2007, Pages 107~113
The Kuem-River, one of the largest rivers in Korea, is the primary water source for more than 4 million people in Kongju city and surrounding area. To study the effect of stormwater runoff to CSOs, twelve monitoring sites were selected in two large cities (City of Kongju and City of Buyeo) near the Kuem-River. Monitoring was reformed by collecting grab samples, measuring flow rates during dry and wet seasons during over two rainy seasons. Generally the flow rate of wastewater in combined sewers was rapidly decreased after 23:00 P.M. and gradually increased from 06:30 A.M. in all sites during the dry season. The concentrations of pollutant increase approximately 5 to 7 fold for TSS and 1.5 to 2.5 fold for BOD during the rainy season. Monitoring and statistical analysis show that the groundwater contributes on sewage volume increase (average 25-45% more) during dry periods and the stormwater runoff contributes approximately 51-72% increase during rainy periods. Generally the concentrations of combined sewage were more polluted during the first flush period than after the first flush during a storm event.