Table 3

Classification . | Estimation methods . | Estimation formula . | Initial value . |
---|---|---|---|

Methods based on temperature | Blaney & Criddle (1950) | k = 0.87 | |

Linacre (1977) | m = 500 | ||

Kharrufa (1985) | a = 0.34,b = 0.55 | ||

Hamon (1961) | |||

Methods based on mass-transfer | Rohwer (1962) | c = 0.44 | |

Penman (1948) | d = 0.35 | ||

Methods based on radiation | Priestley & Taylor (1972) | f = 1.26 | |

Makkink (1957) | g = 0.61 | ||

Abtew (1996) | K = 0.53 | ||

Hargreaves (1975) | n = 0.0135 | ||

Doorenbos & Pruitt (1977) | |||

Jensen & Haise (1963) |

Classification . | Estimation methods . | Estimation formula . | Initial value . |
---|---|---|---|

Methods based on temperature | Blaney & Criddle (1950) | k = 0.87 | |

Linacre (1977) | m = 500 | ||

Kharrufa (1985) | a = 0.34,b = 0.55 | ||

Hamon (1961) | |||

Methods based on mass-transfer | Rohwer (1962) | c = 0.44 | |

Penman (1948) | d = 0.35 | ||

Methods based on radiation | Priestley & Taylor (1972) | f = 1.26 | |

Makkink (1957) | g = 0.61 | ||

Abtew (1996) | K = 0.53 | ||

Hargreaves (1975) | n = 0.0135 | ||

Doorenbos & Pruitt (1977) | |||

Jensen & Haise (1963) |

is the reactant influence coefficient; *p* is the percentage of daytime hours as a percentage of the daytime hours; is the dew point temperature (°C); *h* is the site elevation (m); *A* is the latitude (°), where the site is located, it is the daytime duration (h); is the saturated water vapour density term; is the short-wave radiation (MJ/(m^{2}d)); in the Doorenbos & Pruitt (1977) formula, ; is the temperature constant, this study considers −3 °C; removes the selected parameters that need to be adjusted (experience coefficients are not explained), and other symbols have the same meaning as formula 3.

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