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9 .1 นิยามและความหมาย

บทที่ 9 การคายระเหยน้ำ (Evapotranspiration). 9 .1 นิยามและความหมาย. Evaportranspiration = Evaporation + Transpiration

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9 .1 นิยามและความหมาย

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  1. บทที่ 9 การคายระเหยน้ำ (Evapotranspiration) 9.1 นิยามและความหมาย Evaportranspiration = Evaporation + Transpiration Evaporation = The transfer of water into the atmosphere from the free water surface, bare soil and interception on a vegetal cover. Transpiration = Evaporation through the stomata. (stomata =pores or opening in the external cell layer of the leaves or epidermis.) Et = The concurrent of evaporation and transpiration.

  2. Average disposition of 4200 billion Cubic meters per day of precipitation in the conterminous United States. (source: Data from U.S. Geological Survey, 1990). Evapotranspiration 67 % Surface-Water Outflow 28 % Ground Water Outflow 2 % Consumptive use 2 %

  3. เปรียบเทียบปริมาณการคายระเหยในเดือนมกราคม กับเดือนกรกฏคมของปี พ.ศ. 2545

  4. ประเภทของการคายระเหยน้ำ : (1) Potential Et (PEt) = Et from a vegetal cover if sufficient water is supplied to obtain optimum growth. (2) Actual Et (AEt) = Et from a vegetal cover under the natural or given conditions of supply water.

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