摘要:

ABSTRACTSublimation is important in the generation of loose sediment for wind transport in periglacial environments. A thermophysical model based on laboratory experimentation indicates that the rate of loose particle production increases with increasing temperature, and to a lesser extent, with decreasing water content and particle roundness. Particle size representing void size effects on diffusion resistance seems to have little influence in porous sandy materials. A saturated 1 km2glaciofluvial outwash area at -5°C could produce under calm conditions approximately 7.1×105kg of loose sediment in just one day as a result of pore ice sublimation. Drier sediments peripheral to these areas could produce 3.5 times as much. These amounts, representing volumes in the order of small dunes, illustrate the importance of sublimation in particle supply for cold temperature aeolian transport.

ISSN:0435-3676    

DOI:10.1080/04353676.1990.11880327

出版商:Taylor&Francis    

年代:1990

数据来源: Taylor