Empirical Assessment of Evapotranspiration (ET) using Turc method in Kulong Chhu basin, Bhutan.

Authors

  • Leki Tshering Jigme Namgyel Engineering College
  • Khedrup Dorji Jigme Namgyel Engineering College
  • Tenzin Kalden Jigme Namgyel Engineering College
  • Shelimith Lepcha Jigme Namgyel Engineering College
  • Phuntsho Namgay Jigme Namgyel Engineering College
  • Vasker Sharma Jigme Namgyel Engineering College

Keywords:

—ET, Turc method, Elevation band, DEM

Abstract

Evapotranspiration (ET) rate has not been determined in all the places within the country, Bhutan. Not all the places have complete information about the loss of water from the land surfaces (soil and vegetation) and water bodies. This results in less knowledge about the irrigation of the crop, precipitation and hydrologic cycle. The aim of this project is to estimate the daily ET of each elevation band for the year 2020 within the Kulong Chhu basin. The ET calculation is based on the TURC method (1961) that uses the least parameters under the humid condition. DEM of 30m resolution obtained from the USGS was used to extract and mask the area of interest. The study areaDEM has been used to classify the elevation into different band based on equal interval. The daily
mean temperature (Tmean) and relative humidity (RH) obtained from NCHM and solar radiations
(RG) from PADS have been interpolated within the study. These raster data (RH, Tmean and RG) have
been masked using each elevation band and calculated the average value for each band. Hence
these average values of RH, Tmean and RG were used to calculate the daily ET of each band. A graph
of each elevation band versus its ET has been plotted to compare the ET for different elevation
band. The annual ET in Kulong Chhu basin was estimated to be 395.633mm/year.

Author Biographies

Leki Tshering, Jigme Namgyel Engineering College

Final year student from Diploma in Civil Engineering and Surveying, Department of Civil Engineering and Surveying

Khedrup Dorji, Jigme Namgyel Engineering College

Final year student from a Diploma  in Civil engineering and Surveying, Department of Civil Engineering and Surveying

Tenzin Kalden, Jigme Namgyel Engineering College

Final year student from Diploma in Civil Engineering and Surveying, Department of Civil Engineering and Surveying 

Shelimith Lepcha, Jigme Namgyel Engineering College

Final year student from Diploma in Civil Engineering and Surveying, Department of Civil Engineering and Surveying 

Phuntsho Namgay, Jigme Namgyel Engineering College

Final year student from Diploma in Civil Engineering and Surveying, Department of Civil Engineering and Surveying 

Vasker Sharma, Jigme Namgyel Engineering College

Associate Lecturer from Department of Civil Engineering and Surveying 

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Published

2022-12-29

How to Cite

Tshering, L. ., Dorji, K. ., Kalden, T. ., Lepcha, S. ., Namgay, P. ., & Sharma, V. . (2022). Empirical Assessment of Evapotranspiration (ET) using Turc method in Kulong Chhu basin, Bhutan. JNEC Thruel Rig Sar Toed, 5(1). Retrieved from http://trst.jnec.edu.bt/index.php/thruelrigsartoed/article/view/6

Issue

Vol. 5 No. 1 (2021): JNEC Thruel Rig Sar Toed

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Articles

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