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Long-term trend and variability of precipitation in Chhattisgarh State, India

机译:印度恰蒂斯加尔邦的长期趋势和降水变化

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摘要

Spatial and temporal precipitation variability in Chhattisgarh State in India was examined by using monthly precipitation data for 102 years (1901-2002) from 16 stations. The homogeneity of precipitation data was evaluated by the double-mass curve approach and the presence of serial correlation by lag-1 autocorrelation coefficient. Linear regression analysis, the conventional Mann-Kendall (MK) test, and Spearman's rho were employed to identify trends and Sen's slope to estimate the slope of trend line. The coefficient of variation (CV) was used to analyze precipitation variability. Spatial interpolation was done by a Kriging process using ArcGIS 9.3. Results of both parametric and non-parametric tests and trend tests showed that at 5 % significance level, annual precipitation exhibited a decreasing trend at all stations except Bilaspur and Dantewada. For both annual and monsoon precipitation, Sen's test showed a decreasing trend for all stations, except Bilaspur and Dantewada. The highest percentage of variability was observed in winter precipitation (88.75 %) and minimum percentage variability in annual series (14.01 %) over the 102-year periods.
机译:通过使用16个站的102年(1901-2002年)月度降水数据,对印度恰蒂斯加尔邦的时空降水变化进行了研究。通过双质量曲线法评估降水资料的均匀性,并通过lag-1自相关系数评估序列相关性的存在。使用线性回归分析,常规的Mann-Kendall(MK)检验和Spearman的rho来识别趋势,并使用Sen的斜率来估计趋势线的斜率。变异系数(CV)用于分析降水的变异性。空间插值是使用ArcGIS 9.3通过Kriging过程完成的。参数和非参数测试以及趋势测试的结果均表明,在显着性水平为5%时,除Bilaspur和Dantewada以外的所有站点的年降水量都呈现下降趋势。对于年降水量和季风降水,Sen的检验表明,除了比拉斯布尔和丹塔瓦达以外,所有站点的下降趋势都很大。在102年的时间里,冬季降水的变化率最高(88.75%),年度序列的变化率最低(14.01%)。

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  • 来源
    《Theoretical and applied climatology》 |2017年第4期|729-744|共16页
  • 作者单位

    Indian Inst Technol, Dept Water Resources Dev & Management, Roorkee, Uttar Pradesh, India;

    Texas A&M Univ, Dept Biol & Agr Engn, College Stn, TX 77843 USA|Texas A&M Univ, Zachry Dept Civil Engn, College Stn, TX 77843 USA;

    Rani Durgavati Univ, Dept Math & Comp Sci, Jabalpur, MP, India|RTM Nagpur Univ, Dept Math, Nagpur, Maharashtra, India;

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