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Turbulent Rivers Bjorn Birnir

Summary: Turbulent Rivers
Bj¨orn Birnir
Center for Complex and Nonlinear Science
Department of Mathematics
University of California, Santa Barbara
The existence of solutions describing the turbulent flow in rivers is proven.
The existence of an associated invariant measure describing the statistical
properties of this one dimensional turbulence is established. The turbulent
solutions are not smooth but H¨older continuous with exponent 3/4. The
scaling of the solutions' second structure (or width) function gives rise to
Hack's law [16]; stating that the length of the main river, in mature river
basins, scales with the area of the basin l Ah, h = 0.568 being Hack's
1 Introduction
The flow of water in streams and rivers is a fascinating problem with many appli-
cation that has intrigued scientists and laymen for many centuries, see Levi [21].
Surprisingly it is still not completely understood even in one or two-dimensional
approximation of the full three-dimensional flow. Erosion by water seems to de-


Source: Akhmedov, Azer - Department of Mathematics, University of California at Santa Barbara


Collections: Mathematics