Model Simulations of the Hengill Area,Southwestern Iceland |
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Authors: | Gunnar Gunnarsson Andri Arnaldsson Anna Lilja Oddsdóttir |
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Institution: | (1) National Environmental Research Institute, Aarhus University, Aarhus, Denmark;(2) Department of Biological Sciences, Aarhus University, Aarhus, Denmark;(3) Macaulay Land Use Research Institute, Catchment Management Group, Craigebuckler, Aberdeen, UK |
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Abstract: | The Hengill Area is an important energy source for Reykjavík and surrounding area, both for electricity and district space
heating. Two production fields are located in the area: Nesjavellir and Hellisheiei. Two other potential production fields
are believed to be in the area. We present a new conceptual model supported by numerical calculations for the entire Hengill
Area. Calculations were performed using the TOUGH2{{\tt TOUGH2}} software suite. The model contains nine layers consisting of 966 elements each (total of 8,964). Geological survey data,
down-hole measurements, and production histories from the fields have been used to calibrate the model. The model has been
used to predict how production will affect the geothermal fields. Information gathered throughout the production history,
such as drawdown and changes in enthalpy, have been used to re-evaluate the size and the production capacity of the production
fields. Different production scenarios, such as different energy throughput, have been simulated. The model simulations have
also been used to estimate the capacity of potential future production fields. |
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