Comparison of Statistical, Graphical, and Wavelet Transform Analyses for Rainfall Trends and Patterns in Badulu Oya Catchment, Sri Lanka
Joint Authors
Rathnayake, Upaka
Perera, Anushka
Ruwangika, Ashika M.
Source
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-13, 13 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-10-21
Country of Publication
Egypt
No. of Pages
13
Main Subjects
Abstract EN
Climate change has adversely influenced many activities.
It has increased the intensified precipitation events in some places and decreased the precipitation in some other places.
In addition, some research studies revealed that the climate change has moved seasons in the temporal scale.
Therefore, the changes can be seen in both spatial and temporal scales.
Thus, analyzing climate change in the localized environments is highly essential.
Rainfall trend analysis in a localized catchment can improve many aspects of water resource management not only to the catchment itself but also to some of the related other catchments.
This research is carried to identify the rainfall trends in Badulu Oya catchment, Sri Lanka.
The catchment is important as it is in the intermediate climate zone and rich in agricultural productions.
Four rain gauges (namely, Badulla, Kandekatiya, Lower Spring Valley, and Ledgerwatte Estate) were used to analyze the rainfalls in the resolutions of monthly, seasonally, and annually.
30-year monthly cumulative rainfall data for the above four gauging stations are analyzed using various standard tests.
Nonparametric tests including Mann–Kendall test and sequential Mann–Kendall test and innovative trend analysis methods are used to identify the potential rainfall trends in Badulu Oya catchment.
In addition, continuous wavelet transforms and discrete wavelet transforms tests are carried out to check the patterns on rainfall to the catchment.
The trend analysis methods are compared against each other to identify the better technique.
The results reveal that the nonparametric Mann–Kendall test is powerful to produce the statistically significant rainfall trends in qualitative and quantitative manner.
Mann–Kendall analysis shows a positive trend to Ledgerwatte Estate in monthly (3.7 mm in February and 7.4 mm in October), seasonal (6.9 mm in the 2ndintermonsoon), and annual (3 mm annually) scales.
However, the analysis records one decreasing rainfall trend to Kandekatiya (8.1 mm in December) only in monthly scale.
Nevertheless, it was found that the graphical method can be easily used in qualitative analysis, while discrete wavelet transformations are efficient in identifying the rainfall patterns effectively.
American Psychological Association (APA)
Ruwangika, Ashika M.& Perera, Anushka& Rathnayake, Upaka. 2020. Comparison of Statistical, Graphical, and Wavelet Transform Analyses for Rainfall Trends and Patterns in Badulu Oya Catchment, Sri Lanka. Complexity،Vol. 2020, no. 2020, pp.1-13.
https://search.emarefa.net/detail/BIM-1143593
Modern Language Association (MLA)
Ruwangika, Ashika M.…[et al.]. Comparison of Statistical, Graphical, and Wavelet Transform Analyses for Rainfall Trends and Patterns in Badulu Oya Catchment, Sri Lanka. Complexity No. 2020 (2020), pp.1-13.
https://search.emarefa.net/detail/BIM-1143593
American Medical Association (AMA)
Ruwangika, Ashika M.& Perera, Anushka& Rathnayake, Upaka. Comparison of Statistical, Graphical, and Wavelet Transform Analyses for Rainfall Trends and Patterns in Badulu Oya Catchment, Sri Lanka. Complexity. 2020. Vol. 2020, no. 2020, pp.1-13.
https://search.emarefa.net/detail/BIM-1143593
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1143593