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.
Original language | English |
---|---|
Pages (from-to) | 623-626 |
Number of pages | 4 |
Journal | Journal of Irrigation and Drainage Engineering |
Volume | 132 |
Issue number | 6 |
DOIs | |
Publication status | Published - Nov 2006 |
Keywords
- Channels
- Evaporation
- Porous media
- Seepage
ASJC Scopus subject areas
- Civil and Structural Engineering
- Water Science and Technology
- Agricultural and Biological Sciences (miscellaneous)