Observations on the growth of an internal boundary layer with a Lidar technique

Chia R. Chu, Marc Parlange, William E. Eichinger, Gabriel Katul

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

The distribution of atmospheric water vapor across a step change in surface humidity (dry-wet) was observed by a Lidar measurement technique under neutral atmospheric stability condition. The technique uses multiple elevation scans from a scanning water Raman-Lidar to construct a time-averaged image of the variation in water vapor concentration with height and distance. The measurements were obtained from a bare soil field in California's central valley. The growth of the vapor blanket over the wet surface was identified by the spatial distribution of the specific humidity over the field. The height of the local humidity boundary layer under neutral atmospheric stability condition was observed to increase as δv ∝ X0.87, where x is the downstream distance from surface humidity discontinuity line. Evaporation rates calculated from the humidity profiles agreed satisfactorily with the fluxes independently measured using a lysimeter.

Original languageEnglish
Title of host publicationProceedings of the Symposium on Fundamentals and Advancements in Hydraulic Measurements and Experimentation
PublisherAmerican Society of Civil Engineers
Pages519-529
Number of pages11
ISBN (Print)0784400369
Publication statusPublished - 1994
Externally publishedYes
EventSymposium on Fundamentals and Advancements in Hydraulic Measurements and Experimentation 1994 - Buffalo, United States of America
Duration: 1 Aug 19945 Aug 1994

Conference

ConferenceSymposium on Fundamentals and Advancements in Hydraulic Measurements and Experimentation 1994
CountryUnited States of America
CityBuffalo
Period1/08/945/08/94

Cite this

Chu, C. R., Parlange, M., Eichinger, W. E., & Katul, G. (1994). Observations on the growth of an internal boundary layer with a Lidar technique. In Proceedings of the Symposium on Fundamentals and Advancements in Hydraulic Measurements and Experimentation (pp. 519-529). American Society of Civil Engineers.