Landslide inventory for the administrative area of Breaza, Curvature Subcarpathians, România.

This paper presents a landslide inventory for the administrative area of Breaza, Prahova County, România. The Breaza administrative area is located between 25°35′37.8″ and 25°42′12″ east longitude and 45°7′47″ and 45°13′45″ north latitude, covering an area of approximately 50 km². The landslide inventory contains 177 old and new landslides classified by type of movement, depth and activity. The landslides were mapped by combining image interpretation of old air-photos and recent orthophotos with detailed field surveys. By type of movement, most of the landslides are rotational slides (ca. 92%) and very few are translational slides (3%), complex landslides (3%) or earth flows (2%). The size of the landslides is diverse, ranging from very small ( 0.001 km2) to big landslides extending over an entire hillslope ( 0.65 km2). An important contribution in mapping the landslides bodies was the use of oblique and vertical aerial photos. These photos were taken from a small aircraft (Cessna F172H) using a Canon 400D camera equipped with an 18-250 mm lens. The aerial photos provide, from different view points, a large scale perspective over natural landscape processes and helped us to classify the landslides by type of movement. Some of them were used to create anaglyph images, bringing a 3D perspective to the image interpretation process. The vertical photos were successfully georeferenced with a standard error of approximately 10 m and used in a GIS for mapping the location of the landslides units. The landslide inventory is presented as two maps: (1) landslides by type of movement overlain onto the landslide depth and (2) landslide activity. The scale of mapping ranges from 1:200 for field surveys up to 1:5,000 for landslide mapping from the orthophotos and topographical maps. For the final maps the features were adjusted to a scale of 1:5,000. [ABSTRACT FROM AUTHOR]