Recent Trend of Reference Evapotranspiration under Climate Change Perspective: A Case Study in the North-Eastern Region of Bangladesh | Chapter 5 | Emerging Issues in Science and Technology Vol. 4

Many processes in the earth surface are affected by climate change. Climate change affects environment, evapotranspiration (or crop water demand), and water resources. Evapotranspiration (ET), the major component of hydrological cycle, affects crop water requirement directly. The objective of this study was to investigate the temporal trends of ET0 in Mymensingh region, the northeastern part of Bangladesh. For this purpose, meteorological parameters collected from meteorological site over a 25-year period were used. Two statistical tests including Mann-Kendall and Sen’s slope estimator (using MEKESENS software) and linear regression (t-test for significance of slope) were used for the analysis. The same analysis was also performed on governing meteorological variables to identify the cause of existence of such trend in ET0. The results showed decreasing trend of ET0 in dry season (Oct. – March), which is mainly caused by decreasing mean temperature and consistent decrease in wind speed. In wet season (April to September), increasing trend was observed in July only; while the other months except September showed decreasing trend. From the results of the two tests (i.e. MAKESENS Software and Linear Regression), it is revealed that these tests had almost similar performance in detecting trend.

Author(s) Details

Dr. M. H. Ali
Agricultural Engineering Division, Bangladesh Institute of Nuclear Agriculture, BAU Campus, Mymensingh-2202, Bangladesh.  

M. A. Islam
Agricultural Engineering Division, Bangladesh Institute of Nuclear Agriculture, BAU Campus, Mymensingh-2202, Bangladesh.

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