{"title":"Temporal Variation of Rainfall in the Bagmati River Basin, Nepal","authors":"R. Shrestha, A. B. Sthapit","doi":"10.3126/NJST.V16I1.14355","DOIUrl":null,"url":null,"abstract":"The main aim of the study was to identify the temporal variation of rainfall in the Bagmati River basin, Nepal using data available at Department of Hydrology and Meteorology, Government of Nepal. The time series data for the period of 1981-2008 were analyzed by using non-parametric Mann-Kendal test, Spearman’s’ Rho and a parametric linear regression. The results showed that there was a significantly increasing upward trend of the annual mean of weighted areal rainfall, with a rate of 2.2 mm per year. Trend analysis of the monthly time series of weighted areal rainfall showed a significant upward trend in the months of summer monsoon season (June and July). However, there were no such significant result in the other season/months. The increasing trend in the summer monsoon might lead to severe flooding in future. Nepal Journal of Science and Technology Vol. 16, No.1 (2015) pp. 31-40","PeriodicalId":129302,"journal":{"name":"Nepal Journal of Science and Technology","volume":"15 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2016-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"14","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nepal Journal of Science and Technology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.3126/NJST.V16I1.14355","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 14
Abstract
The main aim of the study was to identify the temporal variation of rainfall in the Bagmati River basin, Nepal using data available at Department of Hydrology and Meteorology, Government of Nepal. The time series data for the period of 1981-2008 were analyzed by using non-parametric Mann-Kendal test, Spearman’s’ Rho and a parametric linear regression. The results showed that there was a significantly increasing upward trend of the annual mean of weighted areal rainfall, with a rate of 2.2 mm per year. Trend analysis of the monthly time series of weighted areal rainfall showed a significant upward trend in the months of summer monsoon season (June and July). However, there were no such significant result in the other season/months. The increasing trend in the summer monsoon might lead to severe flooding in future. Nepal Journal of Science and Technology Vol. 16, No.1 (2015) pp. 31-40
该研究的主要目的是利用尼泊尔政府水文和气象部提供的数据确定尼泊尔Bagmati河流域降雨的时间变化。采用非参数Mann-Kendal检验、Spearman’s Rho检验和参数线性回归分析1981-2008年的时间序列数据。结果表明:年平均加权面雨量呈显著上升趋势，上升幅度为2.2 mm / a;加权面雨量的逐月时间序列趋势分析显示，夏季风季(6月和7月)有明显的上升趋势。然而，在其他季节/月份没有如此显著的结果。夏季风的增加趋势可能导致未来严重的洪水。《尼泊尔科学技术杂志》2015年第16卷第1期，第31-40页
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