Rainfall trend analysis
Rainfall trend analysis
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降雨趋势分析
DOI：
10.15740/has/ijas/17.1/121-125
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发表时间：
2021
影响因子：
--
通讯作者：
Rohini M. Kalunge
中科院分区：
文献类型：
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作者：
V. N. Barai;Rohini M. Kalunge
这篇文章的目的是回顾有关印度降雨趋势的研究。非参数检验，如森氏斜率被用来作为估计的趋势幅度，这是支持的Mann-Kendall检验。各种研究的结果表明，降雨率各不相同，导致降雨趋势不确定。在对印度不同地区季风的研究中，有些地方表现出增加的趋势，但在印度各地都有明显的减少趋势。还有人提到，如果使用不同的数据来源或收集类型进行分析，则对一个地点的分析可能各不相同。空间单位从台站结果和细分到用于趋势分析的子流域/河流流域。不同实验的结果各不相同，还没有出现一个简单可靠的降雨趋势图。虽然多个单元（子流域或子分区）可能存在非零斜率值，但很少有值具有统计重要性。在一份流域趋势分析报告中，一些流域的年降雨量呈下降趋势;在95%的置信度阶段，只有一个流域显示出强烈的下降趋势。在六个呈现上升趋势的流域中，有一个流域出现了重大的积极趋势。许多流域在年和季节尺度上的降雨量和雨日具有相同的格局方向。
This article aims to review studies pertaining to trends in rainfall, rainy days over India. Non-parametric tests such as Sen’s Slope were used as estimator of trend magnitude which was supported by Mann-Kendall test. The findings of various studies indicate variance with respect to the rainfall rate, which contributes to an uncertain picture of the rainfall trend. In the study of monsoon of different locations in India some places showed increasing trends however, there is signifying decrease in trend all over India. It was also mentioned that analysis can vary from for a location if done using different source or types of collection of data. Spatial units range from station results and sub-division to sub-basin/river basins for trend analysis. The outcomes of the different experiments vary and a simple and reliable picture of the trend of rainfall has not appeared. While there can be a non-zero slope value for the multiple units (sub-basins or sub-divisions), few values are statistically important. In a basin-wise trend analysis report, some basins had a declining annual rainfall trend; at a 95 per cent confidence stage, only one basin showed a strong decreasing trend. Out of the six basins exhibiting a rising trend saw a major positive trend in one basin. Many of the basins have the same pattern direction on the annual and seasonal scale for rainfall and rainy days.