Effects of current-bed form induced fluid flow on the thermal regime of sediments

被引:73
作者
Cardenas, M. Bayani [1 ]
Wilson, John L. [1 ]
机构
[1] New Mexico Inst Min & Technol, Socorro, NM 87801 USA
关键词
STREAM TEMPERATURE; GROUNDWATER DISCHARGE; RIVER BED; EXCHANGE; FLUXES; ZONES; TRANSPORT; KINETICS; AQUIFERS; BENEATH;
D O I
10.1029/2006WR005343
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Heat transport associated with current-bed form fluid exchange affects biogeochemical and ecological process in a variety of aquatic settings. We simulate turbulent flow over dunes, induced Darcy flow in sediments, and sediment heat transport forced by a diel variation of water column temperature. Heat conduction dominates when the water column current cannot induce rapid fluid exchange. Heat advection becomes important with increasing sediment permeability and/or current velocity, resulting in a complicated space-time temperature pattern. Weak temperature variations are found beneath dune crests, where water upwells out of the sediments; strong variations are located below dune stoss faces, where water downwells. The relative dominance of heat conduction versus advection is captured by a global Peclet number that depends on dune geometry, and hydrodynamic and thermal properties, including the period of thermal forcing. Thermally induced fluid viscosity variations cause periodic but nonsymmetric changes in fluid flux through the sediments, but do not significantly influence temperature patterns.
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页数:12
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