ABSTRACT In this study, annual and seasonal precipitation trend analysis was performed in the Euphrates-Tigris basin, Turkey, using innovative trend analysis (ITA) and discrete wavelet transformation. In this context, it was seen that there is a downward trend in winter, spring and annual precipitation, whereas precipitation has an increasing tendency in summer and autumn seasons, in the greater part of the basin. When annual and seasonal data were decomposed into wavelet components, the most significant trends were observed for high-periodic wavelet components, such as D3 (8-year), D4 (16-year) and D5 (32-year), where these components represent the periods of the precipitation data. Then, the relationship between North Atlantic Oscillation (NAO) and trend in precipitation was investigated. In this regard, it was found that there could be a significant relationship between the NAO and precipitation trends of the Euphrates-Tigris basin, especially in winter, based on the wavelet ITA.

中文翻译：

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小波结合创新趋势分析土耳其幼发拉底河-底格里斯河流域降水数据

摘要 在这项研究中，使用创新趋势分析 (ITA) 和离散小波变换在土耳其幼发拉底河-底格里斯河流域进行了年度和季节性降水趋势分析。在此背景下，流域大部分地区冬季、春季和年降水量呈下降趋势，而夏秋季节降水量呈增加趋势。当将年度和季节性数据分解为小波分量时，观察到高周期小波分量的最显着趋势，例如 D3（8 年）、D4（16 年）和 D5（32 年），其中这些分量代表降水数据的周期。然后，研究了北大西洋涛动 (NAO) 与降水趋势之间的关系。在这方面，