Acta Geographica Sinica ›› 1993, Vol. 48 ›› Issue (5): 457-467.doi: 10.11821/xb199305009

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NUMERICAL STUDY ON EVAPORATION OF LAND SURFACE IN AKSUO REGION

Sheng Weaning, Yao Deliang, Li Jiachun   

  1. Institute of Mechanics CAS, Beijing 100080
  • Online:1993-09-15 Published:1993-09-15

Abstract: The study carries out a numerical simulation of land evaporation in arsuo region. Because the region is extremely dry with limited rainfall, the paper introduces in detail the computation mel:hod for evaporation under the condition of shortage of water. Because of artificid irrigation by Xu.jiang Geographical Institute,the underground water level is raised to 1. 5一2. 0m. In order to study the evaporation in wheat fields,we do not adopt completely computational formulae of eva- poration under the condition of drought. Because climate changes are very abnormal,the author adopts aerodynamics method with the resistances in turbulent ABL to carry out numerical simula- tiori. The vegetation in the model is wheat,and the soil is sandy loam. The date is 15一23, June,1992. The soil suface is covered with wheat completely,therefore the model do not consider the condition of bared soils. The author gives the hourly change trend of the field evapo- transpiration by the comparison with measured data. The author studies the heat transport of the soil,emphasizes particularly on the temperature change between soil and the vezetation layer .and deals with the radiation balance.

Key words: Land evaporation, Aerodynamics, Stratification model, Numerical Simu-lation