Vegetation plays a fundamental role in riverine environments, by affecting both hydrodynamics and morphodynamics. At the same time, flow velocity sediment scouring influence decay of plants uprooting. The balance among such interactions defines whether or not rivers are colonized submerged emergent vegetation. Previous studies focused on shift between vegetated barebed conditions through flume ...

We report external noise-induced threshold shift and pattern formation in ac-driven electroconvection (EC) in nematic liquid crystals. We investigate the noise intensity dependence of the threshold and determine the relationship f(c)(*)=hf(cd)(a) (α ∼ 1.4, h ∼ 0.1) between the characteristic cutoff frequency (f(c)(*)) of the noise and the characteristic ac frequency (f(cd)) of EC. For f(c)>f(c)...

Previous studies have shown that adaptation to a sinusoidal grating raises the contrast threshold for detecting gratings of similar spatial frequency and causes a shift in the apparent frequency of gratings of neighboring spatial frequency. In the present study the threshold rise and frequency shift were studied under two conditions: after adapting to a grating (successive condition) and while ...