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Climate 2019, 7(1), 3; https://doi.org/10.3390/cli7010003

Temporal Changes in Precipitation and Temperature and their Implications on the Streamflow of Rosi River, Central Nepal

1
South Asia Institute of Advanced Studies (SIAS), Min Bhawan-34, N.K.Singh Marga 306, Kathmandu 44600, Nepal
2
Institute for Life Sciences and the Environment, University of Southern Queensland, Toowoomba 4350, Australia
3
Central Department of Hydrology and Meteorology, Tribhuvan University, Kathmandu 44618, Nepal
4
Institute for Studies and Development Worldwide (IFSD) and University of Canberra, Sydney 2000, Australia
*
Author to whom correspondence should be addressed.
Received: 23 October 2018 / Revised: 19 December 2018 / Accepted: 21 December 2018 / Published: 28 December 2018
(This article belongs to the Special Issue Impact of Climate-Change on Water Resources)
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Abstract

Nepal has experienced recent changes in two crucial climatic variables: temperature and precipitation. Therefore, climate-induced water security concerns have now become more pronounced in Nepal as changes in temperature and precipitation have already altered some hydrological processes such as the river runoff in some river systems. However, the linkage between precipitation patterns and streamflow characteristics are poorly understood, especially in small rivers. We analysed the temporal trends of temperature, precipitation, and extreme indices of wet and dry spells in the Rosi watershed in Central Nepal, and observed the temporal patterns of the streamflow of the Rosi river. We also examined the linkages between the average and extreme climate indices and streamflow. We found that the area has warmed up by an average of 0.03 °C/year, and has seen a significant decline in precipitation. The dry spell as represented by the maximum length of the dry spell (CDD) and the magnitude of dryness (AII) has become more pronounced, while the wet spell as represented by the number of heavy rainfall days (R5D) and the precipitation intensity on wet days (SDII) has diminished significantly. Our analysis shows that recent changes in precipitation patterns have affected the streamflow of the Rosi river, as manifested in the observed decline in annual and seasonal streamflows. The decrease in the availability of water in the river is likely to have severe consequences for water security in the area. View Full-Text
Keywords: Himalaya; streamflow; extreme rainfall; watershed Himalaya; streamflow; extreme rainfall; watershed
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Dahal, N.; Shrestha, U.B.; Tuitui, A.; Ojha, H.R. Temporal Changes in Precipitation and Temperature and their Implications on the Streamflow of Rosi River, Central Nepal. Climate 2019, 7, 3.

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