Akademik Veri Yönetim Sistemi
IAH 2024 World Groundwater Congress, Zürich, İsviçre, 8 - 13 Eylül 2024, ss.1, (Özet Bildiri)
This study investigates the effectiveness of sustainable groundwater management strategies for an over-exploited alluvial aquifer using a modeling approach. The study site is the Fetrek Creek hydrogeological basin (714 km2), which is located in an environmentally stressed semi-urban region. The basin is characterized by complete dependency on groundwater, which is shared by the municipality for domestic use, and the agricultural and industrial sectors. A MODFLOW, 3-D transient groundwater flow model was constructed to simulate current groundwater storage fluctuations and to forecast groundwater flow conditions under future conditions. The conceptual model considers the hydrogeological properties of the site and lithological information obtained from borehole log analysis. Groundwater sinks and sources calculated for the last 10 years were used as inputs for the present condition flow model. Groundwater recharge estimations from a SWAT hydrological modeling study were used as transient source inputs. The flow model was calibrated with the optimization code PEST against piezometric level time series from 17 monitoring wells. The calibrated flow model yielded a groundwater storage decrease of an average of 67 Mm3 per year for the period 2013-2021. Three future scenarios were evaluated: 1) the baseline scenario, in which the changing climate affects groundwater recharge and domestic water use increases; 2) Scenario-1, in which advanced treated urban and industrial wastewater streams are reused for irrigation, thereby reducing groundwater pumping; 3) Scenario-2: advanced treated urban and industrial wastewater streams are used to artificially recharge the aquifer through infiltration ponds. In all scenarios, groundwater recharge was simulated using the SWAT model for representative concentration pathways (RCP) 4.5 and 8.5 climate change scenarios for the period 2022 – 2050. These scenarios predict a 23% and 26% decrease in mean annual rainfall, respectively.