İnşaat Mühendisliği

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http://hdl.handle.net/11527/16711

Gözat

Yazar "Aksoy, Hafzullah" ile İnşaat Mühendisliği'a göz atma
  • Öge
    Filling the ponds of Hattuşa - a geohydrological approach to determine inflows by time and volume
    (Springer, 2024) Wittenberg, Hartmut ; Aksoy, Hafzullah ; 0000-0001-6467-1194 ; 0000-0001-5807-5660 ; İnşaat Mühendisliği
    In the ruins of Hattuşa, the capital of the Hittite Empire more than 3,000 years ago, large, sedimented water storage ponds have been uncovered since 1998. An investigation based on time series of measured groundwater levels, showed that the ponds were supplied from layered aquifers which were opened at their source horizons directly at the uphill edge of the pond. When the groundwater level at the pond exceeds a threshold given by the geology at that edge, water pours into the pond. The principles and the path of filling become clear, but not the volumes and time distribution of the transfers. These results of the previous studies were amply published and are shortly summarized. The present investigation is also based on the time series of groundwater levels and of the discharge of a modern fountain as well as the local hydrogeological properties. The approach is simple but shows the effect of storage in the aquifer which delays the outflow into the pond, so that water from the rainy season was available in the dry season. Also, the annual outflow values are determined. Besides gaining knowledge it is an aim of the article to encourage interdisciplinary and process-oriented thinking.
  • Öge
    Formative drought rate to quantify propagation from meteorological to hydrological drought
    (Wiley, 2024) Yıldırım, Işılsu ; Aksoy, Hafzullah ; Hrachowitz, Markus ; orcid.org/0000-0002-4064-624X ; orcid.org/0000-0001-5807-5660 ; orcid.org/0000-0003-0508-1017 ; İnşaat Mühendisliği
    In this study, we propose a probabilistic metric, the formative drought rate (FDR), to quantify drought propagation. It is the probability that a meteorological drought in precipitation forms a hydrological drought in streamflow. Drought events were identified based on the standardized precipitation index and streamflow drought index, respectively, at 1-, 3-, 6- and 12-month timescales. The method was tested in three river basins in Turkey (Kucuk Menderes, Gediz and Ergene). In each river basin, meteorological stations were coupled with streamflow gauging stations to form pairs of stations depending on their distance from each other and the length of their common record periods. The FDR was calculated across all timescales for each pair of stations. It was found capable to describe the river basin-specific spatial and temporal variability of drought propagation. As the FDR is defined in the form of probability, it is expected to be a useful metric for quantifying propagation from meteorological to hydrological drought. Thus, it carries a potential for scientific research and practice in water resources management.