Comparison of Four Precipitation Based Meteorological Drought Indices in Yesilirmak Basin, Turkey

Abstract

Drought, which is often defined as not enough precipitation, does not a mean simple lack of precipitation. This condition, which occurs when humidity is less than the average value for many years, is caused by a disrupted balance between precipitation and evaporation in a region. It is very difficult to predict the start and the end time of drought. In the present study, the drought conditions of the stations selected from Yesilirmak Basin between 1970 and 2014 were determined by using Z-Score Index (ZSI), China-Z Index (CZI), Modified China-Z Index (MCZI), and Standard Precipitation Index (SPI), and the compliance of these indices to the SPI was investigated. It was determined that these indices gave parallel results to each other, and SPI detected drought earlier than other indices.

Analysis of temperature and precipitation series of Hirfanli Dam Basin by Mann Kendall, Spearman’s Rho and Innovative Trend Analysis

“…Slope value (s) can be positive or negative. This means that there is an increasing (+) or decreasing (-) trend in the time series [57][58][59][60][61][62].…”

A new framework to spatial and temporal drought analysis for 1990–2020 period with Mann–Kendall and innovative trend analysis methods in Turkey

“…On the other hand,Zeybekoglu et al (2018) evaluated the 24-month SPI values of the Sinop province for different periods between 1930-1981 with the ITA method and found no signi cant drought trend. Additionally, in this study, similar trend results were obtained for Sinop for each trend analysis method.…”