Capillarity and Evaporation Exacerbated Seepage Losses from Unlined Channels
Publication: Journal of Irrigation and Drainage Engineering
Volume 132, Issue 6
Abstract
Steady, essentially two-dimensional, tension-saturated seepage from a flat-bottomed soil channel in an arid environment is studied analytically. Physically, the action of capillary spreading, evaporative drive to the atmosphere both from the near-channel banks and capillary fringe boundary, Darcian resistance of the matrix and gravity are juxtaposed and result in trifurcation of infiltrated water into deep percolation and semi-infinite evaporation “wings” with two hinge points on the soil surface and two dividing streamlines. Mathematically, free boundary problem is solved by conformal mappings and the Polubarinova-Kochina boundary-value problem method. The dependence of deep percolation losses and evaporative return flow on the channel width, conductivity, static capillary rise height, and intensity of evaporation is found.
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Acknowledgments
The comments of two anonymous referees are appreciated.
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 132 • Issue 6 • December 2006
Pages: 623 - 626
Copyright
© 2006 ASCE.
History
Received: Mar 10, 2005
Accepted: Mar 24, 2006
Published online: Dec 1, 2006
Published in print: Dec 2006
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