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| Titel |
Method for the Preparation of Hazard Map in Urban Area Using Soil Depth and Groundwater Level |
| VerfasserIn |
Sung-Wook Kim, Eun-Kyeong Choi, Jin Woo Cho, Ju-hyoung Lee |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250147283
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| Publikation (Nr.) |
 EGU/EGU2017-11427.pdf |
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| Zusammenfassung |
| The hazard maps for predicting collapse on natural slopes consists of a combination of
topographic, hydrological, and geological factors. Topographic factors are extracted from
DEM, including aspect, slope, curvature, and topographic index. Hydrological factors,
such as distance to drainage, drainage density, stream-power index, and wetness
index are most important factors for slope instability. However, most of the urban
areas are located on the plains and it is difficult to apply the hazard map using the
topography and hydrological factors. In order to evaluate the risk of collapse of
flat and low slope areas, soil depth and groundwater level data were collected and
used as a factor for interpretation. In addition, the reliability of the hazard map was
compared with the disaster history of the study area (Gangnam-gu and Yeouido
district).
In the disaster map of the disaster prevention agency, the urban area was mostly classified
as the stable area and did not reflect the collapse history. Soil depth, drainage conditions and
groundwater level obtained from boreholes were added as input data of hazard map, and
disaster vulnerability increased at the location where the actual collapse points. In the study
area where damage occurred, the moderate and low grades of the vulnerability of previous
hazard map were 12% and 88%, respectively. While, the improved map showed 2% high
grade, moderate grade 29%, low grade 66% and very low grade 2%. These results were
similar to actual damage.
Keywords: hazard map, urban area, soil depth, ground water level
Acknowledgement
This research was supported by a Grant from a Strategic Research Project (Horizontal
Drilling and Stabilization Technologies for Urban Search and Rescue (US&R)
Operation) funded by the Korea Institute of Civil Engineering and Building Technology. |
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