**The influence of sedimentation, local and regional hydrothermal circulation, and thermal rebound on measurements of heat flux from young seafloor**

**M. Hutnak ^{1} and A. T. Fisher^{1,2}**

^{1} Earth and Planetary Sciences Department, University of California,
Santa Cruz, CA 95064

^{2} Institute for Geophysics and Planetary Physics, University of California, Santa Cruz, CA 95064

Download complete preprint of the paper here: Hutnak, M., and A.T. Fisher, The influence of sedimentation, local and regional hydrothermal circulation, and thermal rebound on measurements of heat flux from young seafloor, J. Geophys. Res., 112, B12101, doi:10.1029/2007JB005022, 2007. [PDF of complete paper]

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SlugSed is a one-dimensional numerical model of fluid and heat transport coded in Matlab. In its most basic form, the model calculates the temperature distribution within a medium of finite thickness and known thermal conductivity and heat capacity, given appropriate initial and boundary conditions. The initial conditions consist of depth, temperature, rate(s) of radiogenic heat production or loss, and thermal conductivity for discrete points within the medium. The boundary conditions must be specified as temperature at the top of the medium and either temperature or heat flux at the bottom, and both can be time-variant. SlugSed can accommodate multiple distinct basement layers, each having independent property sets. In the case of sedimentation, the depth-variant physical and thermal properties within the accumulating sediment layer are derived from a user-specified porosity versus depth function. The thermal properties of basement layers (when in use) can be specified in bulk (i.e., applied to all points within the layer) or individually. Seepage of fluids within the sediment layer can be driven by compaction and consolidation, fluid overpressures in basement, or imposed explicitly.

**Link to Cookbook:** [PDF of SlugSed Cookbook]

Explanation as to how BuildSlugSed is used to create the main SlugSed program [PDF Using BuildSlugSed]

**Link to SlugSed Source Code (Matlab format)**: [SlugSed.tar]

README.TXT for SlugSed.tar

**Example problems: Analytical Solutions **

Example 1- Linear flow of heat in the solid bounded by two parallel planes. The region 0 <x<L. Ends kept at zero temperature. Initial temperature f(x)=V_{0}, constant. [Example 1, PDF format]

Example 2- Linear flow of heat in a solid bounded by two parallel planes. The region –L<x<L. Initial temperature = 0, ends at constant temperature. [Example 2, PDF format]

Example 3- Linear flow of heat in a solid bounded by two parallel planes. The region -L<x<L. Zero Initial temperature. Heat production constant. [Example 3, PDF format]

Example 4- Comparison to Benfield (1949) analytical solution for sedimentation on a semi-infinite half space. [Example 4, PDF format]

Example 5- Comparison to Bredehoeft and Papadopulos (1965) analytical solution for steady-state fluid flow between two constant-temperature boundaries. [Example 5, PDF format]

**Example problems: Sediment Accumulation **

Example 6- Constant sediment accumulation, variable sediment porosity, uniform basement properties. [Example 6, PDF format]

Example 7- Constant sediment accumulation, variable sediment porosity, highNu(vigorously convecting) basement aquifer, variable conductivity basement. [Example 7, PDF format]

Example 8- Constant sediment accumulation, variable sediment porosity, highNu(vigorously convecting) basement aquifer, variable conductivity basement, and heat sinks that shut down linearly. [Example 8, PDF format]

Data filecontaining time-series of heat sinks to represent linear reduction in advective heat extraction. This input file is called by the file that is linked to Example 8 above. Both files need to be in the same directory when Example 8 is run.