INVESTIGATION OF ENERGY AND MASS TRANSFERS NEAR THE GROUND INCLUDING THE INFLUENCES OF THE SOIL PLANT-ATMOSPHERE SYSTEM
Abstract
This report describes the research methods and data processing for basic research in the energy and mass transfers near the ground in plants and soil. Fundamental measurements of diurnal cycles of energy and moisture flux rates are reported. These include preliminary measure ments of air drag on a sod surface of 6-meter dia which indicate that von Karman's constant varies from less than 0.4 to more than 0.5. Concurrent hourly profiles of airspeed, tempera ture and moisture are reported and these cover a range of Richardson No. from 0.5 to -2 and show curvatures in the stable case opposite to those reported by Best and by Deacon. They reveal dissimilarities between velocity and temperature profiles which indicate that the eddy transfers processes are more complex than usually assumed. A square-root function of z/L is used to represent the curvature of semilog profiles ranging from strong thermal convection in the daytime to strong stable conditions at night.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1963
- Accession Number
- AD0410263
Entities
People
- D. R. Nielsen
- F. A. Brooks
- W. O. Pruitt
Organizations
- University of California