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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 1, Issue 3 - Dec 2001
Volume 1, Issue 2 - Sep 2001
Volume 1, Issue 1 - Jun 2001
Selecting the target year
Parameter Estimation for Nash Model and Diskin Model by Optimization Techniques
Choi, Min-Ha ; Ahn, Jae-Hyun ; Kim, Joong-Hoon ; Yoon, Yong-Nam ;
Journal of Korean Society of Hazard Mitigation, volume 1, issue 3, 2001, Pages 73~82
This study examines the applicability of the Nash model and the Diskin model, which are linear and nonlinear runoff models, respectively, by applying optimization techniques to the parameter calibration of the two models. Nonlinear programming which is one of traditional optimization techniques and Genetic Algorithm which has been actively applied recently are used in this study. The Nash and Diskin models which use the calibrated parameter with a flood events are applied to a different flood event in Soyang Dam basin. The results obtained from the parameter calibration show slight discrepancy depending upon the flood events. It has been found in the comparion between the observed hydrograph and the hydrographs obtained from the parameter calibration that the Diskin model can better simulate the observed hydrograph than the Nash model can, especially, for the peak flow. This can be analyzed that the Diskin model which is a nonlinear runoff model is better off in simulating the nonlinear characteristic of the rainfall-runoff process.
A Study on the In-Situ Soil Vapor Extraction and Soil Flushing for the Remediation of the Petroleum Contaminated Site
Ko, Seok-Oh ; Kwon, Soo-Youl ; Yoo, Hee-Chan ; Kang, Hee-Man ; Lee, Ju-Goang ;
Journal of Korean Society of Hazard Mitigation, volume 1, issue 3, 2001, Pages 83~92
Field investigations for subsurface soil and groundwater at a gas station showed that the site was severely contaminated and even petroleum compounds as free liquid state were observed. Pilot-scale soil flushing and soil vapor extraction process(SVE) were applied to evaluate the effectiveness of pollutants removal. Surfactant solution, Tween 80, was used to enhance the solubility of petroleum compounds and resulted in about 10 times increase on TPH(Total Petroleum Hydrocarbon) concentration. As for SVE method, maximum concentration of TPH and BTEX reached within 24 hours of extraction and then continuously decreased. Considerations on the groundwater level and the kinetic limitation for volatilization of contaminants have to be taken into account for the effective application of SVE process.
Characteristics of Bed Profile Fluctuation According to Before & After Removal of the Sediment Protection Weir using HEC-6 model
Ahn, Seung-Seop ; Lee, Soo-Sik ; Choi, Yun-Young ; Lee, Jeung-Seok ;
Journal of Korean Society of Hazard Mitigation, volume 1, issue 3, 2001, Pages 93~102
In this study, the characteristics of river bed profile fluctuation are become possible to be used effectively in future estimation of Taehwa river general development plan through analysis and examination according to the effects of sediment protection weir located in the area of the estuary of Taehwa river's main channel using HEC-6 model. The flow conditions needed in analysis of the characteristics of river bed profile fluctuation refer the conditions of flow which secures 95 days in a year, flood flow, and design flood examined in the estimation of Taehwa river maintenance basic plan. First, in analysis result of river bed variation range, there is no significant variation in upstream section from Samho-gyo while there are the more active erosion and sedimentation as the more flow in downstream from Samho-gyo. Next, from the result of the capacity of sediment transfer, it is analyzed that sediment transfer capacity in the area of estuary of Taehwa river has no significant difference in before and after removal of the sediment protection weir when design flood flows while it is estimated that the more flow, the bigger sediment transfer capacity. Therefore, it is thought that the installation of a suitable hydraulic structure at the lowest point of Dong-chun tributary joins from the downstream of Taehwa river can be a good device to reduce the accumulation of sediments at the lowest point of Taehwa river considering the reduction plan of sediment inflow caused by removal of the sediment protection weir.
Analysis of Bridges behavior Considering Pile rigidity and Soil characteristics
An, Zu-Og ; Yoon, Young-Man ;
Journal of Korean Society of Hazard Mitigation, volume 1, issue 3, 2001, Pages 103~110
The objective of this study is to investigate the behavior of superstructure considering several factors such as change of pile rigidity, soil characteristics, and the constraint condition of support. The results of this study are as follows: 1. Pile-rigidity computed by the rotating deformed plane method is continuously varied up to approximately 5D(D=diameter of pile) below the ground level. This result is consistent with the previous study
, in which the pile deformation occurs at approximately
times of pile diameter from the ground level. 2. For bridge structure-pile system, analytical results of internal forces and deformations show different values for modified pile rigidity and unchanged pile rigidity. 3. Detaild analysis considering modified pile rigidity is required for the long-span bridge design with structure pile system.
Reliability Analysis for the Estimation of Frequency-Based Rainfall
Hong, Chang-Sun ; Wone, Seog-Yeon ; Ahn, Jae-Hyun ; Ahn, Won-Sik ;
Journal of Korean Society of Hazard Mitigation, volume 1, issue 3, 2001, Pages 111~122
A reliability analysis is conducted on the process in estimating frequency rainfalls. 39 year of annual maximum data in Seoul station are collected to analyze the reliability in the frequency analysis technique. Frequency analysis is carried out for the nine types of distribution function and three types of parameter estimation method which are currently used in Korea. Reliability Analysis is conducted for the frequency rainfalls determined by 3 types(maximum, median, selected) of method to select the adequate rainfall. Computed rainfalls of each duration and return period are standardized to find the distribution of the frequency rainfall. It shows that the resulting rainfall distribution fairly represents the normal distribution. Coefficient of variation of 0.0456 is computed to be used in estimating the reliability based design rainfall.
Application of Moment Tensor Inversion to Small Local Earthquakes in the Korean Peninsula
Kim, So-Gu ; Van, Phan Thi Kim ; Lee, Seoung-Kyu ;
Journal of Korean Society of Hazard Mitigation, volume 1, issue 3, 2001, Pages 123~136
The purpose of application of moment tensor inversion method is to determine source parameters, such as, focal mechanism, seismic moment and source depth. This paper presents results of focal mechanism solutions of 14 recent events with magnitudes ranging from M3.3 to M4.8 by using moment tensor inversion method called TDMT_INV. The strike of faults is in the direction of NE-SW and NW-SE with the movement of strike-slip or strike-slip of minor reverse component. The compressional axis of the stress field is predominantly E-W or ENE-WSW except for some faults, which are distributed at Ryongnam Massif and Wonsan, they have a compressional axis of N-S or NNW-SSE.