Groundwater Quality Degradation in the Buyuk Menderes River Coastal Wetland

• Published in: Water, air, and soil pollution air, and soil pollution, 2012, Vol.223 (1), p.15-27
• Main Authors: Somay, Melis A., Gemici, Unsal
• Format: Article
• Language: English
• Subjects: Atmospheric Protection/Air Quality Control/Air Pollution; Climate Change/Climate Change Impacts; Coastal; Coastal aquifers; Coastal zone; Dissolution; Drinking water; Earth and Environmental Science; Environment; Environmental monitoring; Evaporation; Groundwater; Hydrogeology; Leaching; Paleozoic; Phosphates; Phosphatic fertilizers; Polyethylene; Protection and preservation; Quartz; Rivers; Saline water intrusion; Salinity; Salinization; Sea water; Seawater; Sediments; Silica; Soil pollution; Soil Science & Conservation; Soils, Salts in; Water quality; Water Quality/Water Pollution; Wetland agriculture; Wetlands
• ISSN: 0049-6979; 1573-2932
• DOI: 10.1007/s11270-011-0834-5

A baseline hydrogeochemical investigation was carried out as a contribution to the inventory of wetlands in Büyük Menderes River (BMR) coastal wetland which is the most important wetland in Turkey that is protected as “Natural Park” by government. In addition to the wetland values, agricultural activities are also important at this delta. From inland to coastal zone, the groundwater type is changed from Ca–HCO 3 to Na–Cl. Perfect correlation of Cl with Na and SO 4 indicated the mixing process between saline and fresh water. The seawater intrusion and “winter-leaching” is the main causes of salinization. Minor ions as B, Br, and Li versus Cl relationship also showed the marine influence at the BMR coastal wetland. The δ 18 O and δD composition of the waters are range between −8.11‰ and −1.65‰ and −49.2‰ and 8.1‰, respectively. Isotope values show the seawater mixing line and also dissolution of salts in the BMR coastal wetland. Weathering of aluminosilicates in the Paleozoic schist and clays resulted in the release of silica to the water. Due to the organic activity, iron concentrations reached to the tolerance limits. On the other hand, the use of phosphate fertilizers increases the phosphorus content in the water. The high value of As (from 0.6 to 134 μg/l) can be resulted as an evaporation process in the study area.