Akademik Veri Yönetim Sistemi
6th Asia-Pacific Conference on Luminescence and Electron Spin Resonance Dating, Ankara, Türkiye, 26 - 28 Eylül 2022, cilt.1, sa.31, ss.41
Hydrological extremes and critical events (HEX) are defined as abrupt changes in river’s discharge above (flood) or below (drought) average threshold. HEX studies now extend beyond the instrumental (long term monitoring) data towards compiling historical record and investigation of fluvial record for past hydrological and climatological changes in the river’s basin. We detail the recent floodplain of the Sakarya River at Adapazarı Basin, east of Marmara Sea in NW Türkiye. The unique tectonic position of the basin enabled in deposition of 4.5 meters of fine-medium grained sediment since 1200 CE. This time-period corresponds to the Little Ice Age (LIA) and the ruling period of the Ottoman Empire. Our multi-disciplinary and multi-proxy (grain size, mineralogical, geochemical analysis, magnetism, pollen assemblages) approach enabled us to determine the palaeohydrology of the river and in contrast detection of the HEX events. All the determined events and episodes were put in a high-resolution timescale with the help of luminescence, dendrochronology and radiocarbon dating methods. The focus sedimentary record revealed that the Sakarya River experienced distinct long-duration optimum flow and drought episodes with intermittent flooding events for the last 600 years. These episodes are closely comparable with the published local and regional paleoclimatic record but in contrast not with the historical social disturbances.
This study is funded by TÜBİTAK 121Y110 project.