Abstract
It is well known that any kind of ordinary hydrometeorological parameter trend may have increasing or decreasing tendency systematically. Various methodologies are developed for possible trend identification such as the well-known Mann-Kendall test and recently Şen innovative trend analysis (ITA) approaches. The former has a set of assumptions, whereas the latter is almost without any restrictive assumption. The main purpose of this paper is to present precipitation and temperature trend behaviors by applying ITA in Yesilirmak drainage basin. Selected observation stations are mainly located at the Black Sea confluence region of Yesilirmak while few others at the middle and upper drainage basins. ITA provided visual inspection with quantitative trend slopes distinctively for low, medium, and high sub-levels with physical interpretations. Based on categorization, precipitation records have significant decreasing trends in low, medium, and high levels as an average − 3.4%, − 3.8%, and − 2.4%, respectively. In contrary to precipitation trend, and consistent to global expectation in climate change, temperature records have significantly strong increasing tendency along the basin. In sub-level of temperature, this strong trend tendencies are detected + 4.6%, + 4.8%, and + 7.2% from low to high ranges, respectively.
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The authors are grateful to The State Water Works (DSI) of Turkey for supplying precipitation and flow data.
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Responsible Editor: Abdullah M. Al-Amri
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Serencam, U. Innovative trend analysis of total annual rainfall and temperature variability case study: Yesilirmak region, Turkey. Arab J Geosci 12, 704 (2019). https://doi.org/10.1007/s12517-019-4903-1
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DOI: https://doi.org/10.1007/s12517-019-4903-1