Precipitation Trends over Time Using Mann-Kendall and Spearman’s rho Tests in Swat River Basin, Pakistan
Joint Authors
Wagan, Bakhtawar
Ahmad, Ijaz
Wang, TianFang
Wang, Mei
Tang, Deshan
Source
Issue
Vol. 2015, Issue 2015 (31 Dec. 2015), pp.1-15, 15 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2015-01-12
Country of Publication
Egypt
No. of Pages
15
Main Subjects
Abstract EN
Accurately predicting precipitation trends is vital in the economic development of a country.
This research investigated precipitation variability across 15 stations in the Swat River basin, Pakistan, over a 51-year study period (1961–2011).
Nonparametric Mann-Kendall (MK) and Spearman’s rho (SR) statistical tests were used to detect trends in monthly, seasonal, and annual precipitation, and the trend-free prewhitening approach was applied to eliminate serial correlation in the precipitation time series.
The results highlighted a mix of positive (increasing) and negative (decreasing) trends in monthly, seasonal, and annual precipitation.
One station in particular, the Saidu Sharif station, showed the maximum number of significant monthly precipitation events, followed by Abazai, Khairabad, and Malakand.
On the seasonal time scale, precipitation trends changed from the summer to the autumn season.
The Saidu Sharif station revealed the highest positive trend (7.48 mm/year) in annual precipitation.
In the entire Swat River basin, statistically insignificant trends were found in the subbasins for the annual precipitation series; however, the Lower Swat subbasin showed the maximum quantitative increase in the precipitation at a rate of 2.18 mm/year.
The performance of the MK and SR tests was consistent at the verified significance level.
American Psychological Association (APA)
Ahmad, Ijaz& Tang, Deshan& Wang, TianFang& Wang, Mei& Wagan, Bakhtawar. 2015. Precipitation Trends over Time Using Mann-Kendall and Spearman’s rho Tests in Swat River Basin, Pakistan. Advances in Meteorology،Vol. 2015, no. 2015, pp.1-15.
https://search.emarefa.net/detail/BIM-1052735
Modern Language Association (MLA)
Ahmad, Ijaz…[et al.]. Precipitation Trends over Time Using Mann-Kendall and Spearman’s rho Tests in Swat River Basin, Pakistan. Advances in Meteorology No. 2015 (2015), pp.1-15.
https://search.emarefa.net/detail/BIM-1052735
American Medical Association (AMA)
Ahmad, Ijaz& Tang, Deshan& Wang, TianFang& Wang, Mei& Wagan, Bakhtawar. Precipitation Trends over Time Using Mann-Kendall and Spearman’s rho Tests in Swat River Basin, Pakistan. Advances in Meteorology. 2015. Vol. 2015, no. 2015, pp.1-15.
https://search.emarefa.net/detail/BIM-1052735
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1052735