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Surface flow and erosion
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While within the soil, the flow is limited by the level of compaction, on the surface, it can drain freely, carrying away part of the upper layer. Specifically, this flow carries the smaller particles corresponding to clay, altering the texture of the surface layer and affecting the support for vegetation growth.
ID:(380, 0)
Surface flow and erosion
Description
While within the soil, the flow is limited by the level of compaction, on the surface, it can drain freely, carrying away part of the upper layer. Specifically, this flow carries the smaller particles corresponding to clay, altering the texture of the surface layer and affecting the support for vegetation growth.
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Examples
(ID 106)
En el caso de un canal cil ndrico el perfil de la distribuci n de velocidades es
| $ v = v_{max} \left(1-\displaystyle\frac{ r ^2}{ R ^2}\right)$ |
donde
En este caso la diferencia de presi n
| $ \Delta p = - \rho \bar{v} \Delta v $ |
\\n\\nse tienen que evaluar las velocidades en los radios
$dp=\displaystyle\frac{1}{2}\rho(v(R)^2-v(R-w)^2)$
lo que resulta en
| $ dp =\displaystyle\frac{ \rho v_{max} ^2}{2 R ^2} w (2 r - w )$ |
(ID 3160)
Si la altura de la plaquita mucho menor al radio del capilar (
| $ dp =\displaystyle\frac{ \rho v_{max} ^2}{2 R ^2} w (2 r - w )$ |
se reduce a:
| $ dp = \rho v_{max} ^2\displaystyle\frac{ r w }{ R ^2}$ |
donde
(ID 4509)
La condici n de que la plaquita levite
| $dp > \rho_s w_c g $ |
se puede reescribir con
| $ dp = \rho v_{max} ^2\displaystyle\frac{ r w }{ R ^2}$ |
resultando la condici n
| $ \rho_w v_{max} ^2\displaystyle\frac{ r }{ R ^2} > \rho_s g $ |
Para poder emplear esta relaci n debemos estudiar el flujo por un capilar y en particular reemplazar la velocidad m xima
(ID 4510)
ID:(380, 0)