Geomorphology: Solitary wave behaviour of sand dunes

  title={Geomorphology: Solitary wave behaviour of sand dunes},
  author={Veit Schw{\"a}mmle and Hans J{\"u}rgen Herrmann},
Barchan sand dunes are highly mobile, crescent-shaped dunes that occur in areas where sand is sparse and the wind is unidirectional. Here we show mathematically how two such loose-grained dunes are able to pass through one another while still preserving their shape. The crucial parameters for this solitary-wave behaviour, which is consistent with field observations, are the heights of the two colliding dunes. 

Solitary wave behavior in sand dunes observed from space

Although the dynamics of individual barchan dunes are well understood, their interactions are the subject of ongoing scientific interest and debate. Numerical and analog model predictions of

Field evidence for surface-wave-induced instability of sand dunes

It is found that dune collisions and changes in wind direction destabilize the dunes and generate surface waves on the barchans, which plays a fundamental role in the control of size selection and the development of dune patterns.

Size Distribution of Barchan Dunes by a Cellular Dune Model

Barchans, which are crescent sand dunes, are observed in desert and on the surface of the Mars. They form barchan field through interaction such as collision processes. In order to investigate

Pattern Formation of Dunes

Dunes are aerodynamic instabilities of a mobile ground. Only recently, the equations of motion of a free granular surface born by air and gravity have been established. I will present the equations

Breeding and solitary wave behavior of dunes.

This work studies the case when a small dune bumps into a bigger one, which means that they can "cross" each other which has been questioned by many researchers before.

Collision behaviors of barchans in aeolian dune fields

In this paper, the probability of the collision behaviors of barchans in aeolian dune fields and the processes of three collision types, i.e., coalescence, breeding and solitary-wave like behavior,

Morphodynamic modeling of aeolian dunes: Review and future plans

Sand dunes are ubiquitous in deserts, on coasts, on the sea bottom, and on the surface of Mars, Venus and Titan. The quantitative understanding of dune dynamics is thus of relevance for a broad range



Minimal model for sand dunes.

The model provides a qualitative understanding of important features of real dunes, such as their longitudinal shape and aspect ratio, the formation of a slip face, the breaking of scale invariance, and the existence of a minimum dune size.

The wind-induced shaping and migration of an isolated dune: A numerical experiment

Numerical experiments are carried out to simulate the development and migration of a barchan dune starting with a conical pile of sand. Such an experiment is done in three steps: (1) computation of

Continuum saltation model for sand dunes.

It is pointed out that saturation transients are indispensable for a proper description of sand flux over structured terrain, by applying the model to the windward side of an isolated dune, thereby resolving recently reported discrepancies between field measurements and theoretical predictions.

The Barchans of Southern Peru

The crescentic sand-dune formation known as the "barchan" occurs extensively in the desert coast of southern Peru. Quantitative measurements were made on 75 of these to determine relationships

The Physics of Blown Sand and Desert Dunes

The physics of blown sand and desert dunes , The physics of blown sand and desert dunes , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی

A Steady-State Model of Wind-Blown Sand Transport

  • B. Werner
  • Physics, Environmental Science
    The Journal of Geology
  • 1990
A model for steady-state eolian saltation is presented in which computation of sand grain trajectories in the wind and of the wind velocity profile modified by saltating grain drag forces is combined

… genetics …

A possible genetic aetiology to CSVT, provides reliable risk estimates and allows accurate comparison with genetic risk in other vascular conditions is supported.