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황태건,김태윤,진호영,김연중,이우동 (사)한국연안방재학회 2024 한국연안방재학회지 Vol.11 No.1
This study investigates the drifting dynamics of objects caused by tsunamis and storm surges, focusing on the influence of solitary wave size, container weight, and revetment type. Utilizing DIPP-Motion video analysis, we observed that larger solitary waves imparted greater momentum flux to containers during the inundation, resulting in increased movement speed and drift distance. Furthermore, lighter containers displayed a shallower limit depth for full floating, reducing the impact of bottom friction and leading to enhanced movement speed and drift distance. Notably, wave-absorbing revetments exhibited a reduced passage area on the slope, leading to heightened flow velocity and significantly greater movement speed and drift distance for drifting containers compared to vertical revetments. This study provides insights into the complex interactions between objects and waves governing drifting behaviors, contributing to the development of more effective mitigation strategies for secondary disasters caused by tsunamis and storm surges.
시공간 비정형 빅데이터를 이용한 외국인 일일 활동의 시공간패턴 분석 - 트위터를 사용하는 서울시 거주 외국인을 대상으로 -
황태건,조성진,황철수 국토지리학회 2016 국토지리학회지 Vol.50 No.4
We analyzed the activity patterns of foreigner in Seoul, using SNS unstructured big data. For the analysis, geo-tagged tweet data were collected for four weeks in the study area, and it was classified into each language. This study was conducted as follows. First, the distinction of the activity between the Korean native speakers and foreign language speakers was investigated by comparing between the Korean tweets and the foreign language tweets. Second, the classified languages of the foreign language tweets were analyzed in a spatial and temporal dimension. Lastly, the founded patterns from the foreign language tweets were validated by comparing to existing structured data, such as the census data. As a result, some differences between the Korean tweets and the foreign language tweets were identified in their daily lives. In addition, the results show that different language tweets conducted diverse types of activities at a different location and time within the study area. 서울시에 거주하는 외국인들의 일일 활동 패턴을 분석하기 위해 약 4주간 위치 태그가 포함된 트위터 자료를 활용하였다. 사용자 언어별로 트윗 발생 시점의 시공간 분포를 다음의 3가지 측면에서 분석하였다. 첫째, 한국인과 외국인의 활동의 차이에 대해 조사하기 위해 한국어 트윗과 외국어 트윗의 분포를 비교하였고, 둘째 언어별 활동 패턴의 차이는 언어별 트윗의 시공간적인 차원에서 분석하였다. 마지막으로 분석결과의 검증을 위해서 외국어 트윗으로부터 찾아낸 패턴과 기존 정형데이터를 비교 분석하였다. 그 결과 한국인과 외국인 사이에 분명한 활동 시공간패턴의 차이가 나타났으며, 사용 언어별 패턴 역시 서로 다른 시공간에서 활동이 발생함을 확인하였다.
황태건,김태윤,최선용,고찬현,이우동 (사)한국연안방재학회 2022 한국연안방재학회지 Vol.9 No.2
The characteristics of a secondary disaster are not well known with respect to the drift-impact by storm surge or tsunami. A numerical analysis for understanding the characteristics of a secondary disaster must be capable of simulating fluid dynamics as well as structural behaviors. In this sense, a fluid-structure interaction analysis is necessary with specialized numerical model such as LS-DYNA. In this study, we numerically simulated the breakaway-drift-impact process of a container due to break waves using LS-DYNA, and additionally examined the applicability of the model. Furthermore, we investigated the validity and effectiveness of an LS-DYNA analysis through the wave pressure comparison of measured values in a hydraulic experiment and the calculated values. In the analysis of drift-impact of a container due to dam-break waves, the drift velocity had a dominant effect, which is in line with previous experiments. In the collision analysis of drifting object due to storm surge/tsunami, the LS-DYNA simulation was proven as an appropriate numerical approach in this study.
Location Tracking of Drifting Container by Solitary Wave Load Using a Motion Analysis Program
황태건,김지원,이동하,이재철 한국해양공학회 2023 韓國海洋工學會誌 Vol.37 No.4
Objects adrift can cause considerable damage to coastal infrastructure and property during tsunami and storm surge events. Despite the potential for harm, the drifting behavior of these objects remains poorly understood, thereby hindering effective prediction and mitigation of collision damage. To address this gap, this study employed a motion analysis program to track a drifting container's location using images from an existing laboratory experiment. The container's trajectory and velocity were calculated based on the positions of five markers strategically placed at its four corners and center. Our findings indicate that the container's maximum drift velocity and distance are directly influenced by the scale of the solitary wave and inversely related to the container's weight. Specifically, heavier containers are less likely to be displaced by solitary waves, while larger waves can damage coastal structures more. This study offers new insights into container drift behavior induced by solitary waves, with implications for enhancing coastal infrastructure design and devising mitigation strategies to minimize the risk of collision damage.