Convective nature of planimetric instability in meandering
نویسنده
چکیده
منابع مشابه
بررسی الگوی پیچان‌رودی رودخانه‌ها با استفاده از شاخص‌های لئوپولد و کورنایس (مطالعه موردی: رودخانه ی بابل رود و سجاد رود)
A great number of towns and villages are established along the rivers and especially on the terraces made by rivers. Under the influences of the river’s dynamic and discharge changes, these lands are constantly exposed to dangers such as the flood and instability of the river bed caused by the river meandering movements. Therefore, examining the meandering pattern of the rivers is necessary in ...
متن کاملMeandering instability of air flow in a granular bed: self-similarity and fluid-solid duality
Meandering instability is familiar to everyone through river meandering or small rivulets of rain flowing down a windshield. However, its physical understanding is still premature, although it could inspire researchers in various fields, such as nonlinear science, fluid mechanics and geophysics, to resolve their long-standing problems. Here, we perform a small-scale experiment in which air flow...
متن کاملConvective and absolute Eckhaus instability leading to modulated waves in a finite box.
We report an experimental study of the secondary modulational instability of a one-dimensional nonlinear traveling wave in a long bounded channel. Two qualitatively different instability regimes involving fronts of spatiotemporal defects are linked to the convective and absolute nature of the instability. Both transitions appear to be subcritical. The spatiotemporal defects control the global m...
متن کاملDoppler effect of nonlinear waves and superspirals in oscillatory media.
Nonlinear waves emitted from a moving source are studied. A meandering spiral in a reaction-diffusion medium provides an example in which waves originate from a source exhibiting a back-and-forth movement in a radial direction. The periodic motion of the source induces a Doppler effect that causes a modulation in wavelength and amplitude of the waves ("superspiral"). Using direct simulations as...
متن کاملEffect of step stiffness and diffusion anisotropy on the meandering of a growing vicinal surface.
We study the step meandering instability on a surface characterized by the alternation of terraces with different properties, as in the case of Si(001). The interplay between diffusion anisotropy and step stiffness induces a finite wavelength instability corresponding to a meandering mode. The instability sets in beyond a threshold value which depends on the relative magnitudes of the destabili...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2017