Abstract We mapped all boulders larger than 105 m on the surface of dwarf planet Ceres using images Dawn framing camera acquired in Low Altitude Mapping Orbit. find that are more numerous toward high latitudes and have a maximum lifetime 150 ± 50 Ma, based crater counts. These characteristics distinctly different from those asteroid (4) Vesta, an earlier target Dawn, which implies Ceres’ mechan...

A two-dimensional hydraulic model River2D was used to investigate the significance of flow complexity on habitat preferences of brook trout Salvelinus fontinalis) in the high-gradient Staunton River in Shenandoah National Park, Virginia. Two 100-m reaches were modeled where detailed brook trout surveys 10–30-m resolution have been conducted annually since 1997. Spatial hydraulic complexity metr...

Quantitative Stfdies on Proteolipide as Incitant of Disseminated Encephalomyelitis in Mice: Chloe Tal and Peter K. Olitsky 420 Fluorescence in -Ultraviolet Light jn--the Study of Boron Deficiency in Celery: Arthur B. Spurt 421 Absence of PhotoiWn in Tl Bacteriophage Irradiated with Ultraviolet in the Dry tate: Ruth F. ill and Harald H. Rous_ _ ---____ _ _ _ 424 Greater Resistance of, the Female...

Context. The tangential YORP effect is a radiation pressure torque produced by asymmetric thermal emission structures on the asteroid surface. Previous works considered these to be boulders of different shapes lying surface asteroid. Aims. We study rough interface asteroid's regolith. Methods. created an approximate analytic theory heat conduction slightly non-flat sinusoidal analyzed published...

Numerical computations for boulder transport have become a state-of-the-art tool hindcasting the hydraulic processes associated with past storm wave and tsunami events. Since most previously developed two-dimensional formulations cater to boulders symmetric outlines, they can consequently reproduce distance velocity of cubic shape or similar structured geometries reasonably well. However, exhib...

Steep mountain rivers have hydraulic and morphodynamic characteristics that hinder velocity measurements. The high spatial variability of hydraulic parameters, such as water depth (WD), river width and flow velocity, makes the choice of a representative cross-section to measure the velocity in detail challenging. Additionally, sediment transport and rapidly changing bed morphology exclude the u...

a r t i c l e i n f o Keywords: palaeoflood Sinai rainfall–runoff model boulder transport flash floods The Wadi Isla drainage basin, a narrow steep bedrock canyon and its tributaries, rises near the highest elevations of the Precambrian Sinai massif on the eastern margin of the tectonically active Gulf of Suez rift. The basin area upstream from the mountain front is 191 km 2 and downstream the ...

Earth analogues for Martian canyons. Steep-walled, amphitheater canyons on Mars have been invoked as evidence for underground water flow because of their similarities to seepage or sapping valleys/canyons on Earth. However, seepage canyon formation on Earth is speculative, particularly in basalt terrains (Lamb et al., 2006), and therefore analogies to Mars may be inappropriate. One of these Ear...