Effect of Rainfall on landslides in Guatemala during hurricane stan
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EFFECT OF RAINFALL ON LANDSLIDES IN GUATEMALA DURING HURRICANE STAN
Rachel Chisolm: EWRE, GIS in Water Resources[1]
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WHERE IN THE WORLD IS GUATEMALA?
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BACKGROUND
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PATH OF HURRICANE/TROPICAL STORM STAN
[5] October 1-4, 2005
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TOPOGRAPHY OF GUATEMALA
Data downloaded from USGS Global 30 arc-second Elevation Dataset (GTOPO30)
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RAINFALL DURING STAN
Up to 34 inches of accumulated rain from October 1-10, 2005 Up to 10.5 inches of rain in a 24 hour period (6 in. at higher
elevations where the majority of landslides occurred) [6]
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PRECIPITATION TRENDS IN GUATEMALA
Rainy Season Dry Season
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SINMAP A STABILITY INDEX APPROACH TO
TERRAIN STABILITY HAZARD MAPPING Measures slope stability taking into
account wetness, slope, and soil cohesion
Factor of Safety:
cossin
tancos2
gDDggDDgCC
FSs
WWsWssr
Cr = root cohesion; Cs = soil cohesion; θ = slope angle; ρs = wet soil density; ρw = density of water; g = gravitational acceleration; D = vertical soil depth; DW = vertical height of water table; φ = internal friction angle of soil
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CONTRIBUTING AREA
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FROM SINMAP SAMPLE DATA
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KNOWN LAND SLIDE LOCATIONS DURING STAN
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ELEVATION AND PRECIPITATION EFFECTS ON LANDSLIDES DURING STAN
Accumulated Precipitation
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CONCLUSIONS Areas with the greatest slope combined
with higher precipitation levels saw the highest concentration of landslides.
Need more refined DEM to accurately map potential landslide areas.
Couple with field work.
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REFERENCES
1) http://www.smate.wwu.edu/teched/geology/GeoHaz/eq-general/eq-general-14.JPG
2) http://www.retiredexpat.com//map-central-america.php3) http://english.peopledaily.com.cn/90001/90777/90852/6454594.html4) http://www.javno.com/en/world/clanak.php?id=1670915) Byron Yury Medina, Fundación Defensores de la Naturaleza, Deslizamientos e
Impactos Ambientales de los Huracanes Mitch y Stan, en Guatemala, http://hercules.cedex.es/hidraulica/PROHIMET/Br07/Comunicaciones/Medina.pdf
6) Resumen del Impacto Asociado al Huracan “Stan” en Guatemala, Instituto Nacional de Sismología, Vulcanología, Meteorología e HidrologíaI (INSIVUMEH), Octubre de 2005.
7) SINMAP User’s Manual, R.T. Pack, et al, Utah State University8) http://www.oxfamamerica.org/newsandpublications/news_updates/
archive2005/news_update.2005-10-12.9620309335
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QUESTIONS???????
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