干旱区生态环境知识资源中心(Arid): Stability and dynamics of convection in dry salt lakes

Arid

DOI	10.1017/jfm.2021.225
	Stability and dynamics of convection in dry salt lakes
	Lasser, Jana; Ernst, Marcel; Goehring, Lucas
通讯作者	Lasser, J ; Ernst, M (corresponding author), Max Planck Inst Dynam & Self Org, Fassberg 17, D-37077 Gottingen, Germany. ; Lasser, J (corresponding author), Complex Sci Hub Vienna, Josefstadterstr 39, A-1080 Vienna, Austria. ; Ernst, M (corresponding author), Univ Gottingen, Fac Phys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany. ; Goehring, L (corresponding author), Nottingham Trent Univ, Sch Sci & Technol, Nottingham NG11 8NS, England.
来源期刊	JOURNAL OF FLUID MECHANICS
ISSN	0022-1120
EISSN	1469-7645
出版年	2021
卷号	917
英文摘要	Dry lakes covered with a salt crust organised into beautifully patterned networks of narrow ridges are common in arid regions. Here, we consider the initial instability and the ultimate fate of buoyancy-driven convection that could lead to such patterns. Specifically, we look at convection in a deep porous medium with a constant throughflow boundary condition on a horizontal surface, which resembles the situation found below an evaporating salt lake. The system is scaled to have only one free parameter, the Rayleigh number, which characterises the relative driving force for convection. We then solve the resulting linear stability problem for the onset of convection. Further exploring the nonlinear regime of this model with pseudo-spectral numerical methods, we demonstrate how the growth of small downwelling plumes is itself unstable to coarsening, as the system develops into a dynamic steady state. In this mature state we show how the typical speeds and length scales of the convective plumes scale with forcing conditions, and the Rayleigh number. Interestingly, a robust length scale emerges for the pattern wavelength, which is largely independent of the driving parameters. Finally, we introduce a spatially inhomogeneous boundary condition - a modulated evaporation rate - to mimic any feedback between a growing salt crust and the evaporation over the dry salt lake. We show how this boundary condition can introduce phase locking of the downwelling plumes below sites of low evaporation, such as at the ridges of salt polygons.
英文关键词	buoyancy-driven instability convection in porous media pattern formation
类型	Article
语种	英语
开放获取类型	Green Accepted, Green Submitted, hybrid
收录类别	SCI-E
WOS记录号	WOS:000642587700001
WOS关键词	QUARTER 5-SPOT CONFIGURATION ; POROUS-MEDIA DISPLACEMENTS ; RAYLEIGH-NUMBER CONVECTION ; SOLUTAL-CONVECTION ; PART 1 ; GROUNDWATER ; FLUID ; CRUST ; PRECIPITATION ; EVAPORATION
WOS类目	Mechanics ; Physics, Fluids & Plasmas
WOS研究方向	Mechanics ; Physics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350819
作者单位	[Lasser, Jana; Ernst, Marcel] Max Planck Inst Dynam & Self Org, Fassberg 17, D-37077 Gottingen, Germany; [Lasser, Jana] Complex Sci Hub Vienna, Josefstadterstr 39, A-1080 Vienna, Austria; [Ernst, Marcel] Univ Gottingen, Fac Phys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany; [Goehring, Lucas] Nottingham Trent Univ, Sch Sci & Technol, Nottingham NG11 8NS, England
推荐引用方式 GB/T 7714	Lasser, Jana,Ernst, Marcel,Goehring, Lucas. Stability and dynamics of convection in dry salt lakes[J],2021,917.
APA	Lasser, Jana,Ernst, Marcel,&Goehring, Lucas.(2021).Stability and dynamics of convection in dry salt lakes.JOURNAL OF FLUID MECHANICS,917.
MLA	Lasser, Jana,et al."Stability and dynamics of convection in dry salt lakes".JOURNAL OF FLUID MECHANICS 917(2021).