recordSubsurface_Basic

basic subsurface parameters with default values

Extends from TransiEnt.Basics.Icons.Record (Icon for records).

Information

1. Purpose of model

Base record defining thermophysical and hydrological properties of the aquifer, confining layers, and pore fluid. Provides default values representative of water at 50°C in a sandstone aquifer.

2. Level of detail, physical effects considered, and physical insight

(Purely technical component without physical modeling.)

3. Limits of validity

- All properties are constant (temperature and pressure independent).

- Effective properties of aquifer and aquitard are computed as linear porosity-weighted averages.

4. Interfaces

(no elements)

5. Nomenclature

$\rho_l$	`rho_l`	fluid density [kg/m³]
$\eta$	`eta`	dynamic viscosity of fluid [Pa·s]
	`Cp_l`	specific heat capacity of fluid [J/(kg·K)]
$\lambda_l$	`lambda_l`	thermal conductivity of fluid [W/(m·K)]
$\rho_s$	`rho_s`	density of aquifer solid matrix [kg/m³]
$c_{p,s}$	`Cp_s`	specific heat capacity of aquifer solid [J/(kg·K)]
$\lambda_s$	`lambda_s`	thermal conductivity of aquifer solid [W/(m·K)]
	`n`	porosity of the aquifer [-]
	`k`	radial permeability of aquifer [m²]
	`k_v`	vertical permeability of aquifer [m²]
$T_\mathrm{init}$	`T_initial`	initial temperature of aquifer [K]
$p_\mathrm{init}$	`p_initial`	initial pressure of aquifer [Pa]
	`C_w`	volumetric heat capacity of fluid [J/(m³·K)]
	`C_a`	volumetric heat capacity of aquifer matrix [J/(m³·K)]
	`n_c`	porosity of confining layers [-]
$\rho_{sc}$	`rho_sc`	density of solid in confining layers [kg/m³]
$c_{p,sc}$	`Cp_sc`	specific heat capacity of solid in confining layers [J/(kg·K)]
$\lambda_{sc}$	`lambda_sc`	thermal conductivity of solid in confining layers [W/(m·K)]
$\rho_\mathrm{aq}$	`rho`	effective density of aquifer (porosity-weighted) [kg/m³]
$\rho_c$	`rho_c`	effective density of aquitard (porosity-weighted) [kg/m³]
$c_{p,\mathrm{aq}}$	`Cp`	effective specific heat capacity of aquifer (porosity-weighted) [J/(kg·K)]
$c_{p,c}$	`Cp_c`	effective specific heat capacity of aquitard (porosity-weighted) [J/(kg·K)]
$\lambda_\mathrm{aq}$	`lambda_a`	effective thermal conductivity of aquifer (porosity-weighted) [W/(m·K)]
$\lambda_c$	`lambda_c`	effective thermal conductivity of aquitard (porosity-weighted) [W/(m·K)]
	`d_h`	horizontal dispersion coefficient [m]
	`d_v`	vertical dispersion coefficient [m]

6. Governing Equations

(no equations)

7. Remarks for Usage

Extend this record and override parameters to define site-specific aquifer properties. See Molz1983 for an example with literature-validated values.

8. Validation

(no validation or testing necessary)

9. References

(no remarks)

10. Version History

Model created by Markus Gillner (markus.gillner@tuhh.de), May 2026

Model revised by Markus Gillner (markus.gillner@tuhh.de), June 2026

- Removed a duplicate declaration of the parameter C (volumetric heat capacity of aquifer).

Parameters

Type	Name	Default	Description
Property values › fluid properties
SI.Density	rho_l	988.04	Density of fluid, default: density of water at 50°C
SI.DynamicViscosity	eta	0.466*10^(-3)	Dynamic Viscosity of fluid, default: dynamic viscosity of water at 50°C
SI.SpecificHeatCapacity	Cp_l	4181.5	Specific Heat Capacity of fluid, default: capacity of water at 50 °C
SI.ThermalConductivity	lambda_l	0.64	Heat Conductivity of the fluid, default: conductivity of water at 50°C
Real	C_w	4.03*10^6	volumetric Heat Capacity of fluid, default: capacity of water at 50°C
Property values › matrix properties in aquifer
SI.Density	rho_s	2000	Density of solid
SI.SpecificHeatCapacity	Cp_s	900	Specific Heat Capacity of solid
SI.ThermalConductivity	lambda_s	2.56	Heat Conductivity of the solid
Real	n	0.25	Porosity of the aquifer
Real	C_a	1.81*10^6	volumetric Heat Capacity of aquifermatrix
SI.Area	k_v	0.5*10^(-12)	Vertical permeability of aquifer, mostly kv=0.1*k
SI.Area	k	25*10^(-12)	Radial permeability of aquifer
Property values › property values of solid in confining layers
Real	n_c	0.35	Porosity of the confining layers
SI.Density	rho_sc	2000	Density of solid in confing layers
SI.SpecificHeatCapacity	Cp_sc	900	Specific Heat Capacity of solid in confining layers
SI.ThermalConductivity	lambda_sc	2.56	Heat Conductivity of the solid in confining layers
Property values › property values of whole aquifer and confining layers
SI.Density	rho	nrho_l + (1 - n)rho_s	Density of aquifer
SI.Density	rho_c	n_crho_l + (1 - n_c)rho_sc	Density of aquitard
SI.SpecificHeatCapacity	Cp	nCp_l + (1 - n)Cp_s	Specific Heat Capacity of aquifer
SI.SpecificHeatCapacity	Cp_c	n_cCp_l + (1 - n_c)Cp_sc	Specific Heat Capacity of aquitard
Real	C	nC_w + (1 - n)C_a	Volumetric heat capacity of aquifer
SI.ThermalConductivity	lambda_c	n_clambda_l + (1 - n_c)lambda_sc	Heat Conductivity of the aquitard
SI.ThermalConductivity	lambda_a	nlambda_l + (1 - n)lambda_s	Heat Conductivity of the aquifer
SI.Length	d_h	0.7	horizontal dispersion coefficient
SI.Length	d_v	0.05	vertical dispersion coefficient
Property values › Initial values
SI.Pressure	p_initial	1000000	inital pressure in aquifer at example 100 bar at the lowest point of the well
SI.Temperature	T_initial	311.15	initial temperature in aquifer at t=0s