Investigations numériques d’une circulation d’eau de mer induite par des failles dans le système géothermique de Seferihisar-Balçova Turquie occidentale Investigaciones numéricas de la circulación de agua de mar inducida por una falla en el sistema geotermal de Seferihisar-Balçova, Turquía occidental 土耳其西部Seferihisar-Balçova地热系统断裂诱导海水循环的数值模拟 Simulazioni numeriche di circolazione marina indotta dalle faglie del sistema geotermico del Seferihisar-Balçova, Turchia occidentale Estudos numéricos sobre circulação de água salgada induzida por falhas no sistema geotérmico Seferihisar-Balçova, oeste da Turquia Türkiye’nin batısındaki Seferihisar-Balçova Jeotermal Sisteminde, Fay Kontrollü Deniz Suyu Dolaşımının Sayısal İncelemesi | Numerical investigations of fault-induced seawater circulation in the Seferihisar-Balçova Geothermal system, western Turkey
2012
Magri, F. | Akar, T. | Gemici, U. | Pekdeger, A.
The Seferihisar-Balçova Geothermal system (SBG), Turkey, is characterized by temperature and hydrochemical anomalies along the faults: thermal waters in northern Balçova are heated meteoric freshwater, whereas the hot springs of the southern Seferihisar region have a strong seawater contribution. Previous numerical simulations of fluid flow and heat transport indicated that focused upsurge of hot water in faults induces a convective-like flow motion in surrounding units. Salt transport is fully coupled to thermally driven flow to study whether fault-induced convection cells could be responsible for seawater encroachment in the SBG. Isotope data are presented to support the numerical findings. The results show that fault-induced convection cells generate seawater plumes that extend from the seafloor toward the faults. At fault intersections, seawater mixes with rising hot thermal waters. The resulting saline fluids ascend to the surface along the fault, driven by buoyant forces. In Balçova, thick alluvium, minor faults and regional flow prevent ascending salty water from spreading at the surface, whereas the weak recharge flow in the thin alluvium of the southern SBG is not sufficient to flush the ascending hot salty waters. These mechanisms could develop in any faulted geothermal system, with implications for minerals and energy migration in sedimentary basins.
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