1 / 4

9 .1 นิยามและความหมาย

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

sheba
Download Presentation

9 .1 นิยามและความหมาย

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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.

More Related