Nearly horizontal sedimentary sequences are typically eroded into escarpments capped by resistant rock layers. These escarpments record in planform the spatial variation in erosional processes. Simulation models have been constructed of scarp development by three processes, scarp backwasting, fluvial erosion, and groundwater sapping, acting singly or in combination. Scarp backwasting produces p...

Abstract. Modeling glacial landform evolution is more challenging than modeling fluvial evolution. While several numerical models of large-scale erosion are available, there only a few erosion, and their application over long time spans requires high effort. In this paper, simple formulation which similar to the stream-power model presented. The reproduces occurrence overdeepenings, hanging val...

Surface runoff is one of dominant factors in hydrological environment, whose spatial pattern and hydrological feature represent the composite factors of its corresponding drainage. And the stream network nodes present spatial structure and attributes of geography and hydrology in a watershed. A quantified method to analyze stream network nodes is proposed in this paper. The typical area of the ...

Concrete structures in a sandstorm environment suffer from erosion for long time, which reduces the durability of concrete buildings, and then threatens safety buildings. Therefore, it is great practical significance to study aeolian sand load under environment. In this paper, by numerical simulation on surface bridge test environment, variation law different parameters studied. Through compara...

Introduction: The recent observations about different waterand ice-related features on Nepenthes region of Mars [1] [2] [3], and the evidence of changes on the Oceanus Borealis’ water level on this region [4] [5] inspired the work here presented. What are exactly the water-related landforms (glacial, periglacial, fluvial, etc) existing in this region of Mars? How are they spatially distributed?...

Abstract The spatial distributions of 239+240 Pu and 137 Cs in soils from Longji Rice Terraces were investigated to evaluate soil erosion. activity concentrations the surface paddy fields range 0.089–0.734 1.80–7.88 mBq/g, respectively. activities showed very similar distribution trends, first increasing then decreasing with elevation. 240 Pu/ 239 atom ratios ranged 0.162 0.232. cores tended be...

sand dunes mobility is one of the serious problems in arid regions. since wind regime is one of the important factors in sand dunes formation, its frequency, direction and magnitude can be effective. amount of wind energy and its directional variability (wind regime) have significant control on the morphology and maintenance of aeolian landforms. by recognizing of morphometric and morphodynamic...

This paper presents LANDFORM, a customized GIS application for semi-automated classification of landform elements, based on landscape parameters. Using custom commands, topographic attributes like curvature or elevation percentile were derived from a Digital Elevation Model (DEM) and used as thresholds for the classification of Crests, Flats, Depressions and Simple Slopes. With a new method, Si...

Layered and massive outcrops on Mars, some as thick as 4 km, display the geomorphic attributes and stratigraphic relations of sedimentary rock. Sequences in some locations imply a dynamic depositional environment during early martian history. Subaerial (such as aeolian, impact, and volcani-clastic) and subaqueous processes may have contributed to the formation of the layers. Affinity for impact...

© The Ecological Society of America www.frontiersinecology.org F many scientists, the only dust they think about is the thin film of material that accumulates on their computer monitor on a regular basis. However, dust has enormous relevance to a wide range of ecological processes and environmental management challenges. Dust is fine particulate material that is removed from the land surface by...