Accession Number : ADA139099

Title :   The Role of Vegetation in the Low-Level Water Budget in Fog.

Descriptive Note : Final rept. 2 Oct 82-2 Oct 83,


Personal Author(s) : Wattle,B. J. ; Mack,E. J. ; Pilie,R. J. ; Hanley,J. T.

Report Date : JAN 1984

Pagination or Media Count : 40

Abstract : Calspan conducted a limited investigation of the influence of vegetation on the low-level water budget in fog at Albany, NY, as part of the SUNY Fog Project. The objective of this field study was to explore the role of vegetation as a sink for liquid water in fog thorugh deposition, precipitation and impaction prcesses, and as a possible source of water which (through re-evaporation) could be instrumental in prolonging a fog. This effort was a follow-up to and expansion of past Calspan study of dew deposition and fog water impaction on vegetation. Measurements to date indicate that the presence of the grass has little or no effect on the rate of dew deposition; average measured dew deposition rates at Albany were 18 g/sq. m/hr. The data further show that fog water is deposited at rates which are two to five times those of pre-fog dew deposition rates. The data suggest that approximately one-half of the water deposition over the general meadow surface during deep, dense fog occurs primarily through precipitation. Fog water collection by impaction on vegetation which extends into the free air above the general meadow height accounts for the other 50% of deposited fog water.

Descriptors :   *Fog, *Vegetation, Dew, Deposition, Water, Radiation, Density, Drops, Precipitation, Moisture content, Evaporation, Plates, Scale, Models, Simulation, Grasses, Measurement, Rates, Surfaces, Experimental data, Data acquisition, New York

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE