Chapter 2 理论与公式
2.3 气象驱动
2.3.2 蒸散发
2.3.2.1 风廓线 (Wind profile)
Equation 2.3 in (Abtew and Melesse 2012)
\[\begin{equation} \boldsymbol{u}_{x}=\boldsymbol{u}_{m} \frac{\ln \frac{z_{x}-d}{z_{0}}}{\ln \frac{z_{m}-d}{z_{0}}} \end{equation}\]
- \(u_x\) - 目标高度的风速 [\(m s^{-1}\)]
- \(u_m\) - 测量高度的风速 [\(m s^{-1}\)]
- \(z_x\) - 目标高度 [\(m\)]
- \(z_m\) - 测量高度 [\(m\)]
- \(d\) - 零平面 [\(m\)]
- \(z0\) - 粗糙度(Roughness height) [\(m\)]
FAO56
植被覆盖的
开放水面和裸露土地的潜在蒸发(PET of bare soil and open water) \[\begin{equation} \lambda E_{a}=c_{2} \frac{e_{a}-e_{d}}{r_{a}} \end{equation}\]
\(E_a\) 是同温蒸发率(Isothermal evaporation rate)。
\[\begin{equation} \mathrm{E}_{\mathrm{o}}=\frac{\Delta\left(\mathrm{R}_{\mathrm{n}}-\mathrm{G}\right) / \lambda+\gamma \mathrm{E}_{\mathrm{a}}}{\Delta+\gamma} \end{equation}\]
References
Abtew, W., and A. M. Melesse. 2012. Evaporation and Evapotranspiration: Measurements and Estimations. Springer Netherlands. https://books.google.com/books?id=C84zLgEACAAJ.