期刊
EUROPEAN JOURNAL OF SOIL SCIENCE
卷 69, 期 2, 页码 279-289出版社
WILEY
DOI: 10.1111/ejss.12531
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Effects of wind speed and wind gustiness on horizontal and vertical subsurface gas transport and subsurface-atmosphere gas exchange were investigated experimentally using a 40cmx40cm, 35-cm-deep stainless steel container, filled with a dry granular porous medium (crushed basalt) of 2-4-mm grain size. Experiments used CO2 and O-2 as tracer gases and were conducted under both steady and gusty wind at speeds ranging from 0 to 5.6ms(-1). Tracer gas breakthrough curves were measured at 20 locations within the porous medium to assess both horizontal and vertical gas movement. Results indicated that horizontal gas movement in wind-exposed porous materials is important, especially near the wind-exposed surface, and suggested considerable effects of both wind speed and wind gustiness on both horizontal and vertical gas transport inside the porous medium as well as subsurface-atmospheric gas exchange. Although wind-induced subsurface gas transport is likely to be multidimensional, one-dimensional model simulations indicated that vertical transport is an adequate approximation of the resulting average gas transport and exchange with the atmosphere over a larger area.
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