使用R语言中SPEI包计算标准化降雨指数和标准化降雨蒸散指数,得到的指数值格式无法直接数据,例如:使用spei(),时间间隔为一个月,分别得到了每年十二个月的指数值,使用write.csv()函数导出数据是出现错误,请问应该如何将得到的值保存到CSV文件中?程序如下: library(lmomco) library(SPEI) banan <-read.csv("F:\\...
关键词:干旱指数;SPEI;SPI;适用性;陕北地区中图分类号:P463.1 文献标识码:A文章编号:0439-8114(2020)21-0042-09DOI:10.14088/j.cnki.issn0439-8114.2020.21.010 开放科学(资源服务)标识码(OSID):Adaptability research on the common meteorological drought indexes ofSPEI and SPI in the northern Shaanxi ...
SPEI 中位数表现出了明显的月季变 化(图 2a),冬季月份 SPEI 干旱指数收敛性较强, 变化幅度较小,中位数总体上位亍-1.0±0.1 之间, 春季和秋季 SPEI 干旱指数较为离散,变化幅度较 大,5 和 9 月份 SPEI 中位数处亍 0.8±0.1 之间,而 表1 SPEI 和 SPI 干旱等级划 分 Table 1 SPEI and SPI ...
Drought is a complex threat where its propagation is not yet controllable, causing more environmental, social, and economic damage. This research assesses the effects of incessant warming and decrescent precipitation by calculating SPI and SPEI from 1985 to 2021 in the Amman 鈥揨arqa Basin based ...
[基金申请] 国家社科后期资助结项 25+3 mailhby1971 2025-02-21 5/250 2025-02-25 12:42 by 青岛阿京 [论文投稿] Colloids and Surfaces A: Physicochemical and Engineering Aspects 10+4 xiao沐 2025-02-21 5/250 2025-02-23 19:45 by babero 切换...
R中的SPEI和SPI指数计算您可能正在使用SPI的最新版本（SPEI 1.8.0）。在此版本中，plot.spi（）已...
权威网站SPI和SPEI程序及操作手册，以及其他版本的此类程序，如matlab、R版，另附上几篇相关文献！
in the Chinese real estate sector,” said Stephen Innes, managing partner atSPIAsset Management 财新周刊|西北暖湿化信号 发布时间:2022-12-17 (12) 变化,必须引入考虑降水和蒸发的干旱指数。科学研究上常用的干旱指数包括标准化降水指数(SPI)、标准化降水蒸散发指数(SPEI)、地表湿润指数(SWI)、自适应帕默尔...
The Mann-Kendall test was applied to assess trends in climatic conditions and drought characteristics.The results showed that although both the SPI and SPEI can be used to assess droughts, the SPEI is more effective at capturing changes in air temperature increases. The intensity and frequency of...
This study aims to analyze the performances and correlation of the standardized precipitation index (SPI) and standardized precipitation evaporation index (SPEI) from the perspective of supplying effective indicators for drought risk management prevention. Indices have been evaluated using long time series ...