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Spatial and temporal variability of rainfall distribution in hilly region of Nepal

Author Affiliations

  • 1Forest Research Institute (deemed to be) University, Dehradun, India
  • 2Forest Ecology and Climate Change Division, Forest Research Institute, Dehradun, India

Int. Res. J. Environment Sci., Volume 7, Issue (11), Pages 15-21, November,22 (2018)

Abstract

The study provides information about the nature of rainfall regimes across hilly regions of Nepal. Hilly areas of Nepal are always vulnerable to frequent and more climate induced hazards, i.e., erratic rainfall, landslide erosion, flashflood, drought etc. In this study, 30 years rainfall data (from 1987 to 2016) from 17 field stations were analyzed using statistical parameters like Mean, Median, Standard Deviation, Coefficient of Skewness and Coefficient of Variation). Statistical parameters were used to check the rainfall variability. The study parameters indicated that rainfall varied significantly at all the stations. The total annual average rainfall in all station was 1818.093mm. The average maximum and minimum annual rainfall varied from 2233.13mm (during 1999) to 1543.47 mm (during 1992) respectively. Similarly, the highest and lowest average rainfall varied from 3015.04mm to 832.78mm respectively in Pansayakhola and Nepalthok station. The study area of Hill region receives 80.87% highest annual average in the monsoon rainfall and lowest in the winter rainfall (3.29%). Thus analysis of rainfall data helps in exploring problems related to rainfall that may be high intensity, low intensity, erratic or no rainfall. At the same time analysis of such historical rainfall data in hilly areas helps in understanding issues related to drought, landslides and floods. These estimates predict possible pathways and help policy makers in understanding the variability of rainfall distribution across hilly region which is important for future planning and management strategies.

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