GIS BASED STUDY OF ROCK SLOPE INSTABILITIES IN MOUNTAINOUS KARST AREAS AND THE CONSEQUENCES ON HIGHWAY CONSTRUCTION, GUIZHOU PROVINCE, CHINA
2004 (English)Conference paper (Other (popular scientific, debate etc.))
The Guizhou Province in southwest central China is characterized by complex geological fold belts resulting in a varying geomorphologic pattern with steep valleys and ridges. The dominating carbonate rocks cause a karst environment with rough topography and bedrock outcrops lacking soil cover, leading to a fragmentation of the natural ecology environment. Soil erosion is another major problem of this densely populated area.
During intense exploitation of the area due to extended highway construction projects, there are risks for further fragmentation of the landscape. The construction process furthermore is triggering the establishment of rock falls and rock landslides endangering natural ecosystems and human lives. For the prediction and prevention of larger rock falls and rock landslides it is necessary to measure dip and strike of bedding and joints in the involved geological strata in relation to road directions. These data, together with elevation data and its derivates (slope, aspect) are put together in a GIS system enabling risk assessment for geohazards. The elevation data for this study are derived from freely available SRTM data with a 90 m grid. Landsat TM and ETM+ is use as ancillary data. The lithological and tectonic information is based on the Geological Map of Guizhou province, scale 1 : 500 000, dip and strike from local measurements.
Based on the derived information we hope to establish recommendations for the design and construction of prevention measures.
Place, publisher, year, edition, pages
Rock Slope instabilty, GIS, Highway construction, GUIZHOU PROVINCE, CHINA
IdentifiersURN: urn:nbn:se:uu:diva-73511OAI: oai:DiVA.org:uu-73511DiVA: diva2:101421