21. Evapotranspiration Equations: Penman and Blaney & Criddle Methods
Evapotranspiration is a crucial process in the hydrological cycle, combining evaporation and transpiration, significantly influencing water resource management. The Penman and Blaney & Criddle methods are key techniques for estimating evapotranspiration, with distinct applications based on data availability and climate conditions. Understanding these methods is essential for effective irrigation scheduling, water resource planning, and hydrological modeling.
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What we have learnt
- Evapotranspiration is the total loss of water from soil through evaporation and transpiration.
- The Penman Method combines energy balance and aerodynamic principles for estimating potential evapotranspiration (PET).
- The Blaney & Criddle Method provides a simpler empirical approach suitable for regions with limited climatic data.
Key Concepts
- -- Evapotranspiration (ET)
- The combined process of evaporation from soil and water surfaces and transpiration from plant surfaces.
- -- Potential Evapotranspiration (PET)
- The evapotranspiration that would occur if water is abundantly available.
- -- Actual Evapotranspiration (AET)
- The evapotranspiration that actually occurs, considering soil moisture limitations.
- -- Penman Method
- A physically-based approach to estimate potential evapotranspiration using energy balance and aerodynamic principles.
- -- Blaney & Criddle Method
- An empirical method for estimating evapotranspiration based on temperature and daylight hours, suitable for regions with limited data.
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