气候变化领域集成服务门户(CCPortal): Precipitation characteristics of two complex mountain river basins on the southern slopes of the central Himalayas

CCPortal

DOI	10.1007/s00704-019-02897-7
	Precipitation characteristics of two complex mountain river basins on the southern slopes of the central Himalayas
	Shrestha, Suraj; Yao, Tandong; Kattel, Dambaru Ballab; Devkota, Lochan Prasad
通讯作者	Kattel, DB (通讯作者)
发表日期	2019
ISSN	0177-798X
EISSN	1434-4483
起始页码	1159
结束页码	1178
卷号	138 期号:1-2
英文摘要	This study investigates the daily, monthly, and seasonal characteristics of precipitation and associated forcing processes for their spatial-temporal variations over two geographically distinct river basins (Kaligandaki and Koshi) in Nepal, located on the southern slopes of the central Himalayas. A 34-year (1981-2015) daily precipitation data set of 49 stations between the elevation ranges of 143 to 3870 m asl was used for this investigation. The Gini coefficient, and index, degree and period of precipitation concentrations, and rainfall gradients were derived to examine precipitation distribution characteristics and causes for their variation. A rapid decrease of rainfall with elevation was observed in the Kaligandaki basin throughout the period of record, while this pattern was reversed in the Koshi basin, due to the rain shadow and orographic effects, which is pronounced in the monsoon season. Mountain effects are likely responsible for the distinct differences in daily and monthly precipitation distribution, with irregular patterns observed in the northern region of Kaligandaki basin and southern region in Koshi basin, with uniform patterns in the southern region of Kaligandaki basin and the northern region of Koshi basin. There is also a distinct variation in seasonality, which is higher (concentrated over several months) in the central northern region in Kaligandaki basin and less concentrated in the northern region of Koshi basin. But monthly precipitation characteristics in the western portion of Koshi and the southern region of Kaligandaki basins show high variability and short concentration duration. However, the months when precipitation is concentrated differed between the basins: from late July to August in Kaligandaki and June to September in Koshi basin. This is because the monsoon arrives later in the west than in the eastern part of the country. Variation in number of rainy days is higher in Koshi, but rainfall amount is greatest in Kaligandaki basin due to its proximity to the ocean and the intense effect of the monsoon. In addition to its value for rainfall-induced disaster mitigation strategies and management planning, this study will be useful for hydrological modeling in these areas in the future.
关键词	EXTREME PRECIPITATION WESTERN DISTURBANCES CLIMATE-CHANGE CENTRAL NEPAL TRENDS RAINFALL MONSOON TEMPERATURE VARIABILITY HOMOGENEITY
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000491945900080
来源期刊	THEORETICAL AND APPLIED CLIMATOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259424
推荐引用方式 GB/T 7714	Shrestha, Suraj,Yao, Tandong,Kattel, Dambaru Ballab,et al. Precipitation characteristics of two complex mountain river basins on the southern slopes of the central Himalayas[J]. 中国科学院青藏高原研究所,2019,138(1-2).
APA	Shrestha, Suraj,Yao, Tandong,Kattel, Dambaru Ballab,&Devkota, Lochan Prasad.(2019).Precipitation characteristics of two complex mountain river basins on the southern slopes of the central Himalayas.THEORETICAL AND APPLIED CLIMATOLOGY,138(1-2).
MLA	Shrestha, Suraj,et al."Precipitation characteristics of two complex mountain river basins on the southern slopes of the central Himalayas".THEORETICAL AND APPLIED CLIMATOLOGY 138.1-2(2019).