The hydrographic eastern Mediterranean Basin of Turkey is a drought sensitive area. The basin is an important agricultural area and it is necessary to determine the extent of extreme regional climatic changes as they occur in this basin. Pearson’s correlation coefficient was used to show the correlation between standardized precipitation index (SPI) and standardized streamflow index (SSI) values on different time scales. Data from five meteorological stations and seven stream gauging stations in four sub-basins of the eastern Mediterranean Basin were analyzed over the period from 1967 to 2017. The correlation between SSI and SPI indicated that in response to meteorological drought, hydrological drought experiences a one-year delay then occurs in the following year. This is more evident at all stations from the mid-1990s. The main factor causing hydrological drought is prolonged low precipitation or the presence of a particularly dry year. Results showed that over a long period (12 months), hydrological drought is longer and more severe in the upper part than the lower part of the sub-basins. According to SPI-12 values, an uninterrupted drought period is observed from 2002–2003 to 2008–2009. Results indicated that among the drought events, moderate drought is the most common on all timescales in all sub-basins during the past 51 years. Long-term dry periods with moderate and severe droughts are observed for up to 10 years or more since the late 1990s, especially in the upper part of the sub-basins. As precipitation increases in late autumn and early winter, the stream flow also increases and thus the highest and most positive correlation values (0.26–0.54) are found in January. Correlation values (ranging between −0.11 and −0.01) are weaker and negative in summer and autumn due to low rainfall. This is more evident at all stations in September. The relation between hydrological and meteorological droughts is more evident, with the correlation values above 0.50 on longer timescales (12- and 24-months). The results presented in this study allow an understanding of the characteristics of drought events and are instructive for overcoming drought. This will facilitate the development of strategies for the appropriate management of water resources in the eastern Mediterranean Basin, which has a high agricultural potential.

土耳其的地中海东部水文地理区是干旱敏感地区。该流域是重要的农业地区，有必要确定该流域发生的极端区域气候变化的程度。皮尔逊相关系数用于显示不同时间尺度上的标准化降水指数（SPI）和标准流指数（SSI）值之间的相关性。分析了1967年至2017年期间地中海东部盆地四个子流域的五个气象站和七个测流站的数据。SSI和SPI的相关性表明，响应气象干旱，水文干旱经历了一次-然后在下一年发生年份延迟。在1990年代中期以来的所有台站上，这一点都更加明显。造成水文干旱的主要因素是长期降水不足或特别干旱的一年。结果表明，在很长的一段时间（12个月）中，子盆地的上部比下部的干旱更长，更严重。根据SPI-12的值，从2002–2003年到2008–2009年观察到不间断的干旱期。结果表明，在过去的51年中，在所有次流域中，在所有时间尺度上，中度干旱是最普遍的干旱事件。自1990年代后期以来，尤其是在次流域的上部地区，长期干旱和中度和重度干旱被观察到长达10年或更长时间。随着秋末和初冬降水的增加，水流也增加，因此最高和最正相关值（0.26--0）。54）在一月份被发现。由于降雨量少，夏季和秋季的相关值（在-0.11和-0.01之间）较弱且为负。这在9月的所有电台中都更加明显。水文干旱和气象干旱之间的关系更为明显，在更长的时间范围内（12个月和24个月），相关值高于0.50。这项研究中提出的结果有助于了解干旱事件的特征，对克服干旱具有指导意义。这将促进制定具有适当农业潜力的地中海东部盆地水资源适当管理战略的发展。水文干旱和气象干旱之间的关系更为明显，在更长的时间范围内（12个月和24个月），相关值高于0.50。这项研究中提出的结果有助于了解干旱事件的特征，对克服干旱具有指导意义。这将促进制定具有适当农业潜力的东地中海盆地水资源适当管理战略的发展。水文干旱和气象干旱之间的关系更为明显，在更长的时间范围内（12个月和24个月），相关值高于0.50。这项研究中提出的结果有助于了解干旱事件的特征，对克服干旱具有指导意义。这将促进制定具有适当农业潜力的地中海东部盆地水资源适当管理战略的发展。