soils of the arid–semiarid karaj basin in north-central iran have formed on alluvium-colluvium derived from mixed calcareous-gypsiferous marls of miocene and basic igneous rocks of holocene age. in order to characterize and classify the soils and to determine the soil-landscape relationship in the area, sixteen pedons located on different physiographic positions have been described, sampled and...

Topography affects the intensity and spatial distribution of precipitation due to orographic lifting mechanisms and, in turn, influences prevailing climate vegetation distribution. Previous modelling studies on impact landform evolution have considered bare soil conditions. However, research effect changes regimes induced by elevation gradients (particularly aspect-controlled semi-arid ecosyste...

available online at http://meteoritics.org 617 © Meteoritical Society, 2004. Printed in USA. “Comet-tail” ejecta streaks: A predicted cratering landform unique to Titan

A robust method for spatial prediction of landslide hazard in roaded and roadless areas of forest is described. The method is based on assigning digital terrain attributes into continuous landform classes. The continuous landform classification is achieved by applying a fuzzy k-means approach to a watershed scale area before the classification is extrapolated to a broader region. The extrapolat...

Many Firmiana species are locally endemic, providing an interesting system for studying adaptation and speciation. Among these species, F. danxiaensis is a tree species endemic to Mount Danxia in Guangdong, China, which is an area known for presenting the Danxia landform. How F. danxiaensis could have adapted to the stressful environment of rocky cliffs covered with barren soils in the Danxia l...

We introduce a concept of content-based landscape retrieval (CBLR). Our CBLR system retrieves morphometrically similar landscapes from a large DEM thus acting as a search engine for landscapes. The system works on the principle of query-byexample, a reference landscape is given and the system outputs a map showing degree of similarity between a reference and all the other local landscapes acros...

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Abstract Inspired by structural geology, karstology, geomorphology, as well petroleum coupling excellent documented research works and the field investigation, status prospect for studies on karst feature of Tahe oilfield are discussed comprehensively. Results indicate: (a) majority have appeared since 2000 can be classified three categories 12 subclasses, in which caves, fracture cave systems ...