Analysis of rainfall data of some West African countries using wavelet transform and nonlinear time series techniques

IF 1 4区地球科学 Q4 GEOGRAPHY, PHYSICAL

Journal of Spatial Science Pub Date : 2022-01-12 DOI:10.1080/14498596.2021.2008539

E. Falayi, J. Adepitan, A. Adewole, T. Roy-Layinde

引用次数: 3

Abstract

ABSTRACT The chaotic behaviour of monthly rainfall data of Benin, Cote d’Ivoire, Cameroon, Ghana, Niger, Nigeria, Senegal and Togo between January 1901 and December 2015 were investigated using wavelet transformation analysis and time series techniques. Wavelet power spectrum was used to split the time series into different scales. Power concentrations between 8 and 16 months were observed for the selected locations. The embedding dimension, delay and largest Lyapunov exponent (LE) were calculated. We observed positive LE ranging from 0.13 to 0.36, indicating the rainfall was chaotic. Ghana had the highest values of LE, while the lowest LE was observed at Niger..

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用小波变换和非线性时间序列技术分析西非一些国家的降雨资料

利用小波变换分析和时间序列技术研究了1901年1月至2015年12月期间贝宁、科特迪瓦、喀麦隆、加纳、尼日尔、尼日利亚、塞内加尔和多哥的逐月降雨数据的混沌行为。利用小波功率谱将时间序列分割成不同的尺度。在选定地点观察到8至16个月的能量集中。计算了嵌入维数、时延和最大李雅普诺夫指数(LE)。我们观察到正LE在0.13 ~ 0.36之间，表明降雨是混乱的。加纳的效率最高，尼日尔的效率最低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Spatial Science 地学-地质学

CiteScore

5.00

自引率

5.30%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of Spatial Science publishes papers broadly across the spatial sciences including such areas as cartography, geodesy, geographic information science, hydrography, digital image analysis and photogrammetry, remote sensing, surveying and related areas. Two types of papers are published by he journal: Research Papers and Professional Papers. Research Papers (including reviews) are peer-reviewed and must meet a minimum standard of making a contribution to the knowledge base of an area of the spatial sciences. This can be achieved through the empirical or theoretical contribution to knowledge that produces significant new outcomes. It is anticipated that Professional Papers will be written by industry practitioners. Professional Papers describe innovative aspects of professional practise and applications that advance the development of the spatial industry.