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Analysis of rainfall trends of two complex mountain river basins on the southern slopes of the Central Himalayas
Shrestha, S (Shrestha, Suraj)1,2; Yao, TD (Yao, Tandong)1,3; Adhikari, TR (Adhikari, Tirtha Raj)4
Source PublicationATMOSPHERIC RESEARCH
2019
Volume215Issue:0Pages:99-115
DOI10.1016/j.atmosres.2018.08.027
Abstract

Understanding rainfall characteristics plays a vital role in sustainable watershed development and management, but at the same time it is challenging in mountainous regions, due to its topography complexities. This study investigates the seasonal along its associated months and annual rainfall characteristics and their variations over two distinct river basins; Kaligandaki in central west and Koshi in eastern Nepal, located on the southern slopes of the central Himalayas, which is crucial to the research of the climate change in these regions. The rainfall data series over the period of 34-year (1981-2015) of 43 stations between the elevation range of 143 m asl to 3870 m asl was used for this study. The analysis was carried out to assess the significance of rainfall trend along with its magnitude followed by its abrupt shift by using the Mann-Kendall test, Sen's test and Sequential Mann-Kendall test respectively. Furthermore, multitaper method was used to confirm the influence of large-scale circulation indices over the study area. An increasing pattern of rainfall from south to north was observed throughout all season in Koshi basin which was not seen in the Kaligandaki basin, indicating the effects of orography along with monsoon. Both basins share a similar pattern of rainfall between annual and monsoonal rainfall, supporting that both basins are dominated by the monsoon. The transition months between the seasons showed almost similar spatial distribution but different from other months of respective seasons. The results showed that the seasonal and annual rainfall declined in most of the stations of both the basins, except during pre-monsoon where it showed increased rainfall. But only a few stations showing such changes were statistically significant. In fact, these noticeable significant decreases were observed especially in the southern and northern region of Koshi basin while in Kaligandaki basin, it was found either in central or in the southern region. Furthermore, the trend shift analysis identified change points during 1980s or early 1990s, but most significant shifts were observed in recent years with some exceptions. Spectral analysis showed significant peaks at periodicity ranging 2-5 years, suggesting a potential association with Quasi-Biennial Oscillations (QBO) and El Nifio-Southern Oscillation (ENSO).

Subject AreaAtmospheric Sciences
WOS IDWOS:000447575100008
Language英语
Indexed BySCI
KeywordLong-term Trends Extreme Precipitation Climate-change Temporal Variability Western Disturbances Monsoon Rainfall Summer Monsoon Nepal Himalaya Temperature Northern
WOS Research AreaMeteorology & Atmospheric Sciences
WOS SubjectMeteorology & Atmospheric Sciences
Cooperation Status国际
ISSN0169-8095
Department环境变化与地表过程
URL查看原文
PublisherELSEVIER SCIENCE INC
SubtypeArticle
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/9462
Collection图书馆
Corresponding AuthorShrestha, S (Shrestha, Suraj)
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, 16 Lincui Rd, Beijing 100101, Peoples R China;
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China;
3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China;
4.Tribhuvan Univ, Cent Dept Hydrol & Meteorol, Kathmandu, Nepal.
Recommended Citation
GB/T 7714
Shrestha, S ,Yao, TD ,Adhikari, TR . Analysis of rainfall trends of two complex mountain river basins on the southern slopes of the Central Himalayas[J]. ATMOSPHERIC RESEARCH,2019,215(0):99-115.
APA Shrestha, S ,Yao, TD ,&Adhikari, TR .(2019).Analysis of rainfall trends of two complex mountain river basins on the southern slopes of the Central Himalayas.ATMOSPHERIC RESEARCH,215(0),99-115.
MLA Shrestha, S ,et al."Analysis of rainfall trends of two complex mountain river basins on the southern slopes of the Central Himalayas".ATMOSPHERIC RESEARCH 215.0(2019):99-115.
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