Geochemical and Isotopic Tracing of Salt Loads into the Ramsar Listed Verlorenvlei Estuarine Lake, South Africa

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• 作者：N.T. Sigidi^a ; J. Miller^a ; ^{jmiller@sun.ac.za} ; A. Watson^a ; C.E. Clarke^b ; M. Butler^c
• 关键词：Wetlands ; Stable isotopes ; Shallow groundwater ; Surface water ; Salinity ; Verlorenvlei catchment ; South Africa
• 刊名：Procedia Earth and Planetary Science
• 出版年：2017
• 出版时间：2017
• 年：2017
• 卷：17
• 期：Complete
• 页码：909-912
• 全文大小：277 K
• 卷排序：17

文摘

δ2H and δ18O ratios, major ions, tritium and EC was used to constrain the sources of salt into the Verlorenvlei River and the Verlorenvlei Ramsar listed estuarine lake and wetlands. Each tributary contributes different quantities of salt into the Verlorenvlei River. The Krom Antonies River is characterised by low EC, >300mS/m, in contrast to the Kruismans and Hol Rivers that have high EC, <1500mS/m. The confluence of the Verlorenvlei River and the Hol River has EC levels in the range of 80.7mS/m to 258mS/m and the Bergvallei has intermediate EC values of between 500 mS/m and 800 mS/m. δ2H and δ18O values range from -18.0‰ to -1.6‰ and -3.6‰ to -0.6‰ respectively. The Kruismans shows a stronger evaporation signature in comparison to the Hol and both rivers have high EC values. The δ2H and δ18O stable isotope shows sources of salt load either as a result of evaporation, mixing water types between rainfall and groundwater while major ions indicate marine (sea aerosol sprays) and dissolution of minerals present in catchment lithologies. Flow rates of the different rivers are being obtained to determine how much salt load each tributary contributes into the Verlorenvlei River.