Trend Analysis Methods for Hydro-Meteorological Parameters

Abstract

Precipitation, temperature and streamflow parameters are the most important hydro-meteorological variables that reveal climate change/climate variability in the planning and management of water resources. Parametric and non-parametric trend tests are used to analyze long-term gradual changes or trends on hydro-meteorological variables. The Mann-Kendall test and Sen's slope estimation method are used as widely as from past to present and have shown very good performance in determining the trend for hydro-meteorological variables. The trend analysis for hydro-meteorological parameters will provide many benefits to water managers in better management and planning of water resources. In this study; informations on the most commonly used trend tests on hydro-meteorological variables was compiled, examples of trend analysis for different regions of the world were put forward, and a general evaluation was made on the importance of trend analysis in the direction of these examples.