I would first look at:

Benkley, Carl W., Lloyd L. Schulman, 1979: Estimating Hourly Mixing Depths from Historical Meteorological Data. J. Appl. Meteor., 18, 772–780.

and

Hennemuth, Barbara, and Andrea Lammert. "Determination of the atmospheric boundary layer height from radiosonde and lidar backscatter." Boundary-layer meteorology 120 (2006): 181-200.

Methods used are simple, but work relatively well in daytime well-mixed BL conditions.

Thank you Mr. Robert Tardif , I will surely look into it .

Mr. Ramachandran, You can look to works at NARL, Gadanki.. Dr. M.Venkat Ratnam doing some work on Boundary layer using GPS RO, radiosoundings etc.. His id is [email protected].. Check more details here http://www.narl.gov.in

Thank you Mr. Kishore ill look into their work for my reference.

You can follow the book on boundary layer meteorology by R. B. Stull

Also papers by A. K. Betts

Here are some suggestion for estimating BLH.

(1) Boundary Layer Height Estimation by Sodar and Sonic

Anemometer Measurements by D. Contini , D. Cava, P. Martano, A. Donateo, F.M. Grasso

(2) Estimating the depth of day time convective boundary layer by J.C. Kaimal (JAM-1982)

(3) AN INDEPENDENT METHOD TO DETERMINE THE HEIGHT OF THE

MIXED LAYER by XIAOHU LIU and EIJI OHTAKI ( BLM-1997)

Thanks for the references.

In addition, two references are available for your question.

Article An automated monitoring of atmospheric mixing height from ro...

Article Mixing Depth Estimation from Operational JMA and KMA Wind-Pr...