Groundwater recharge estımatıon ın the Alaşehir sub-basın usıng hydro-geochemical data; Alaşehir case study

Abstract

The issue of groundwater recharge has gained importance in countries where there is not enough water supply to the aquifer. However, groundwater recharge is a difficult parameter to determine. This difficulty stems from factors such as the location of the area to be studied, time, cost, and hydrological data. Numerical, isotope, and chemical approaches are used in groundwater recharge investigations. Numerical and chemical approaches are more costly and time-consuming than chemical approaches. This study aims to ascertain alluvial aquifer recharge in Alaşehir (Manisa) sub-basin using chemical approaches (Chloride Mass Balance Method) and its applicability. For this purpose, research wells were drilled at 25 different points in the alluvial aquifer, water sampling was done in wet and dry periods, and rainwater water samples were collected. Groundwater recharge was calculated by using chemical approaches from the chloride concentrations of the water samples collected. An annual average of 74.84 mm of recharge was found in the Alaşehir sub-basin. This value corresponds to 16.38% of annual rainfall. At the same time, it was examined the groundwater and geothermal mixing mechanism to demonstrate the applicability of the Chloride Mass Balance Method. It was concluded that geothermal fluid in Alaşehir sub-basin mixed with groundwater at a rate of 17%. Keywords Groundwater recharge • Alaşehir sub-basin • Gediz basin • Chloride mass balance method (CMB)This article is a part of the Topical collection in Environmental Earth Sciences on "Water Problems in E. Mediterranean Countries" guest edited by H. Gökçeku, D. Orhon, V. Nourania, and S. Sozen.

Effect of Model Structure and Calibration Algorithm on Discharge Simulation

“…Acısu Basin has an important location at the upstream of Gediz Basin which is one of the largest basins in Türkiye. Hydrologic model studies in this region have priority for irrigation because of its agricultural potential [38][39][40]. For this reason, it is thought that alternative modeling approaches will guide researchers for studies to be carried out in the basin.…”

Effect of Model Structure and Calibration Algorithm on Discharge Simulation in the Acısu Basin, Turkey

“…The Acısu Basin has an important location at the upstream of the Gediz Basin, which is one of the largest basins in Turkey. Hydrological model studies in this region have priority for irrigation because of its agricultural potential [38][39][40]. For this reason, it is thought that alternative modeling approaches will guide researchers for studies to be carried out in the basin.…”