Meandering rivers are common on Earth and other planetary surfaces, yet the conditions necessary to maintain meandering channels are unclear. As a consequence, self-maintaining meandering channels with cutoffs have not been reproduced in the laboratory. Such experimental channels are needed to explore mechanisms controlling migration rate, sinuosity, floodplain formation, and planform morphodyn...

Reservoir architecture is an important basis for studying the sedimentary evolution of underground reservoirs and distribution remaining oil. Taking meander-river reservoir Guantao Formation in Chengdao Oilfield as example, characteristics subsurface meander-belt deposits were studied by seismic sedimentology. Seismic lithology performed using -90° phase wavelet frequency fusions; geomorphology...

Abstract River meandering controls the age of floodplains through its characteristic paces growth and eventual cutoff channel bends, forming oxbows. Hence, floodplain‐age distributions should reflect a river's size migration rate. This hypothesis has been previously tested in numerical simulations, yet without systematic comparisons with natural systems. Here we analyze oxbow spacing timescales...

A compact meander-line resonator is proposed in this paper, which could provide negative permittivity with a small unit-towavelength ratio. The meander-line structure is simple to be designed and is convenient to be controlled. Negative index materials (NIM) are realized using units composed of meander lines and split-ring resonators (SRRs), which have simultaneously negative permittivity and p...

In the Monte desert, increasing population density, changing land rights and infrastructure may encourage livestock activity, with unknown consequences on ecosystems. Factors that influence livestock settlement distribution may affect ecosystem degradation. We hypothesize that surface and groundwater availability influence livestock settlements distribution. We evaluated this hypothesis with a ...

The hydraulics of steep mountain streams differ from lower gradient rivers due to shallow and rough flows, energetic subsurface flow, and macro-scale form drag from immobile boulders and channel and bed forms. Heightened flow resistance and reduced sediment transport rates in steep streams are commonly attributed to macro-scale form drag; however, little work has explored steep river hydrodynam...

[1] Large rivers are major conduits for sediment and nutrient transport and play an important role in global biogeochemical cycles. While smaller rivers received attention in recent decades for hyporheic exchange and nutrient uptake, fewer studies have focused on the dynamics of surface storage zones in large rivers. We investigate transport dynamics in the St. Clair River, an international riv...

We implement Stolt-stretch time migration with an analytical formulation for the optimal stretch parameter and show how it improves the quality of imaging. By a cascaded f-k migration approach with this algorithm, we manage to obtain time migration results on real data comparable to Gazdag’s phase-shift method, with a high accuracy for steeply deeping events at a computational cost dramatically...

We consider the approximation of planar regions by pairs of lemniscates that are stitched together continuously. Lemniscates are level curves of the absolute value of an univariate complex polynomial. We approximate coastal sides or 2D meander like regions such that profiles of arteries, rivers and sinuous roads using lemniscates of two foci and use confocal lemniscates to build orthogonal grid...