• Title/Summary/Keyword: Flood Information

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Monitoring Flood Disaster Using Remote Sensing Data

  • Chengcai, Zhang;Xiuwan, Chen;Gaolong, Zhu;Wenjiang, Zhang;Peng, Sun-Chun
    • Proceedings of the KSRS Conference
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    • 1998.09a
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    • pp.280.2-286
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    • 1998
  • Flood is the main natural disaster mostly in the world. It is a care problem to prevent flood disaster generally. The frequency of flood disaster is high and the distributing field is wide, the 50 percent population and 70 percent properties distribute at the threaten field of flood disaster in China. Flood disaster has caused a huge amount of economical losses and these losses have an increasing trend. Along with the development of reducing natural disaster action, it has become one of the most attentive problems for monitoring flood, preventing flood and forecasting flood efficiently. Remote sensing has the characteristics of large spatial observing areas, wide spectrum ranges, and imaging far away from the targets, imaging capabilities all weather. Spatial remote sensing information, which records the full, processes of the disaster's occurrence and development in real-time. It is a scientific basis for management, planning and decision-making. Through systemic analyzing the RS monitoring theory, based on compounding RS information, the technology and method of monitoring flood disaster are studied.

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Remote Sensing Monitoring and Loss Estimated System of Flood Disaster based on GIS

  • Wenqiu, Wei
    • Proceedings of the KSRS Conference
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    • 2002.10a
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    • pp.507-515
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    • 2002
  • Remote Sensing Monitoring and Loss Estimated System of Flood Disaster based on GIS is an integrated system comprised flood disaster information receiving and collection, flood disaster simulation, and flood disaster estimation. When the system receives and collects remote sensing monitoring and conventional investigation information, the distributional features of flood disaster on space and time is obtained by means of image processing and information fusion. The economic loss of flood disaster can be classified into two pus: direct economic loss and indirect economic loss. The estimation of direct economic loss applies macroscopic economic analysis methods, i.e. applying Product (Industry and Agriculture Gross Product or Gross Domestic Product - GDP) or Unit Synthetic Economic Loss Index, direct economic loss can be estimated. Estimating indirect economic loss applies reduction coefficient methods with direct economic loss. The system can real-timely ascertains flood disaster and estimates flood Loss, so that the science basis fur decision-making of flood control and relieving disaster may be provided.

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A Study on the Characteristics of Flood Damage Caused by landslide and Its Minimization Using GIS-The Case Study in the Samwhadong, Donghae city, Kangwondo, Korea

  • Kang, Sang-Hyuk
    • Spatial Information Research
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    • v.10 no.4
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    • pp.493-499
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    • 2002
  • This paper presents the disaster control due to flooding through the case study of Samwhadong, Donghae city, Kangwondo, broken out at 31, August 2002. In order to assess the characteristics of flood damage one must consider social and geological conditions, the factors of flood risk were derived based on GIS. For reduction of flood damage, flood hazard map was prepared for local residents. These information will support refuge activities, it would aid the reduction of flood damage.

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Development of Strategics for Establishment of Spatial Information by Assessment of GIS-Based Flood Risk (GIS기반 홍수위험도 평가를 통한 공간정보 구축 방안 개발)

  • Sim, Gyoo Seong;Lee, Choon Ho;Lee, Tae Geun;Jee, Gye Hwan
    • Spatial Information Research
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    • v.23 no.2
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    • pp.39-48
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    • 2015
  • In this study, we evaluated flood risk by applying calculation fomula considering practical risk calculated by inundation analysis information through 2D inundation analysis, suggested a plan that provides a standardized information system. Generally, we evaluated flood risk to people and classified four degrees by using inundation depth, velocity, Debris Factor and Flood Hazard Rating relationship because current flood risk assessment method based inundation depth and area was considered to not fully reflect the actual risk to people on flood. We simulated overflow and levee break scenarios according to 500 year and 200 year floods, respectively, by using Flumen which is a 2D flood inundation model for Geumho river basin in Daegu. The result of this study could contribute to inform practical risk information to people in expected flood area. This study can be useful for the fields of disaster estimatingsuch as information analysis, evaluation, planning by offering Risk information based on standardized information system.

Flood Hazard Management Using Mobile GIS (모바일 GIS에 의한 홍수재해관리)

  • 강택순;강성봉;손홍규;유환희
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • 2003.10a
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    • pp.297-302
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    • 2003
  • Recently, Flood hazard has been increased frequently in urban area by rainfall and Typhoon. To manage flood hazard effectively, it needs to construction of flood information management system. Especially, run-off by flood in urban area must be considered not only surface outflow by topographic gradient and elevation but also conduits outflow along conduit network. This paper suggests the flood hazard management system for analyzing flood outflow in urban area using conduits outflow simulation by ILLUDAS model and providing quickly flood hazard information using WebGIS and MobileGIS.

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The Analysis of Flood Propagation Characteristics using Recursive Call Algorithm (재귀호출 알고리듬 기반의 홍수전파 특성 분석)

  • Lee, Geun Sang;Jang, Young Wun;Choi, Yun Woong
    • Spatial Information Research
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    • v.21 no.5
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    • pp.63-72
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    • 2013
  • This paper analyzed the flood propagation characteristics of each flood elevation due to failure of embankment in Muju Namdae Stream using recursive call algorithm. A flood propagation order by the flood elevation was estimated by setting destruction point at Beonggu and Chasan small dam through recursive call algorithm and then, the number of grids of each flood propagation order and accumulated inundation area were calculated. Based on the flood propagation order and the grid size of DEM, flood propagation time could be predicted each flood elevation. As a result, the study could identify the process of flood propagation through distribution characteristic of the flood propagation order obtained from recursive call algorithm, and could provide basic data for protection from flood disaster by selecting the flood vulnerable area through the gradient pattern of the graph for accumulated inundation area each flood propagation order. In addition, the prediction of the flood propagation time for each flood water level using this algorithm helped provide valuable information to calculate the evacuation path and time during the flood season by predicting the flood propagation time of each flood water level.

Flood Risk Mapping using 3D Virtual Reality Based on Geo-Spatial Information (공간정보기반 3차원 가상현실을 이용한 홍수위험지도 제작)

  • Song, Yeong Sun;Lee, Phil Seok;Yeu, Yeon;Kim, Gi Hong
    • Journal of Korean Society for Geospatial Information Science
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    • v.20 no.4
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    • pp.97-104
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    • 2012
  • Recent climate change has increased the occurrence of flood disaster. There are two approaches to prevent flooding damage. One is a structural method and the other is a non-structural method. The production and usage of a flood risk map are the example of non-structural way. The flood risk map displays several kinds of information to minimize casualties and property damage caused from flooding. In order to increase the usage of current flood risk maps and improve intuitive recognition of flood information, this paper produced flood risk maps based on geo-spatial information system using three dimensional virtual reality techniques and investigated the applicability of the maps. Because flood information is easily accessed through online, flood risk maps suggested in this paper are regarded as an efficient tool.

Uncertainty Analysis of Flash-flood Prediction using Remote Sensing and a Geographic Information System based on GcIUH in the Yeongdeok Basin, Korea

  • Choi, Hyun;Chung, Yong-Hyun;Yoon, Hong-Joo
    • Proceedings of the KSRS Conference
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    • v.2
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    • pp.884-887
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    • 2006
  • This paper focuses on minimizing flood damage in the Yeongdeok basin of South Korea by establishing a flood prediction model based on a geographic information system (GIS), remote sensing, and geomorphoclimatic instantaneous unit hydrograph (GcIUH) techniques. The GIS database for flash flood prediction was created using data from digital elevation models (DEMs), soil maps, and Landsat satellite imagery. Flood prediction was based on the peak discharge calculated at the sub-basin scale using hydrogeomorphologic techniques and the threshold runoff value. Using the developed flash flood prediction model, rainfall conditions with the potential to cause flooding were determined based on the cumulative rainfall for 20 minutes, considering rainfall duration, peak discharge, and flooding in the Yeongdeok basin.

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Study on Construction of Flood Hazard Information Support System based on Scenario (시나리오 기반 홍수위험정보지원시스템 구축 방안 연구)

  • Goo, Sin-Hoi;Jin, Kyeong-Hyeok;Cheong, Tae-Sung
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • 2010.04a
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    • pp.389-393
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    • 2010
  • The Objective of this study was to develop a system for visualizing inundation area by using 1-D numerical model analyzing damage information such as inundation area, facilities, land usages, population, building, loads. In this study, we have reviewed hydraulic models to select a flood model for simulation of discharges, water depths and velocities. The study area is Namhan River from Youngwol to Paldang Dam which had a flood damage on upper and below regions of Chungju Dam by a storm event in 2006. At the first, we developed the DB system base on GIS thematic map, ortho images, cadastral maps to analyze flood damages and support decisions making. Changing the boundary conditions such as discharge at the gauging stations, flood simulations were performed and then damages were extracted from the databases information support system based on 1-D numerical hydraulic model, it is expected to be able to analyze flood damages and support a decision making for reduce flood relate damages. In the future, the system developed in this study could be applied for flood forecasting system of small scaled streams.

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Application of Bayesian Networks for Flood Risk Analysis (베이지안 네트워크를 적용한 홍수 위험도 분석)

  • SunWoo, Woo-Yeon;Lee, Kil-Seong;Chung, Eun-Sung
    • Proceedings of the Korea Water Resources Association Conference
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    • 2012.05a
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    • pp.467-467
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    • 2012
  • As the features of recent flood are spatially concentrated, loss of life and property increase by the impact of climate change. In addition to this the public interest in water control information is increased and socially reasonable justification of water control policy is needed. It is necessary to estimate the flood risk in order to let people know the status of flood control and establish flood control policy. For accurate flood risk analysis, we should consider inter-relation between causal factors of flood damage. Hence, flood risk analysis should be applied to interdependence of the factors selected. The Bayesian networks are ideally suited to assist decision-making in situations where there is uncertainty in the data and where the variables are highly interlinked. In this research, to provide more proper water control information the flood risk analysis is performed using the Bayesian networks to handle uncertainty and dependency among 13 specific proxy variables.

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