A geometrical constraint on shadowing in rough surfaces
- Los Alamos National Lab., NM (United States). Astrophysics and Radiation Measurements Group
In modeling the thermal emissivity of a rough surface, such as wind-driven waves on a lake or ocean, it is customary to treat the surface as a collection of individual facets, each of which is flat but tilted with respect to the horizontal. By considering a one-dimensional cross-section through the rough surface, the authors derive a purely geometrical constraint on the statistical distribution of shadowed facet slopes that should be satisfied by any model of surface emissivity that includes the effect of self-shadowing. The purpose is not to develop a single shadowing model, but to provide a condition that any valid shadowing model should satisfy. Although the emphasis of the presentation is theoretical, some practical ramifications will also be discussed.
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 532451
- Report Number(s):
- LA-UR--97-2267; CONF-970706--5; ON: DE97008628
- Country of Publication:
- United States
- Language:
- English
Similar Records
Some techniques for reducing the tower shadow of the DOE/NASA Mod-0 wind turbine tower
Mask roughness induced LER: geometric model at long correlation lengths