Geologic perspective for carbon sequestration by woody biomass burial | Science and Technology for Energy Transition (STET)

Open Access

Table 2

Guidance values for UWV durability design.

Variable^A		Units^B	Target value for sequestration durability^C		MRV^D notes
Variable^A		Units^B	100 y	1000 y	MRV^D notes
K_gw	Groundwater hydraulic conductivity	m/s	≤1 × 10⁻⁹	≤1 × 10⁻¹⁰	These variables address the groundwater-incursion suppression requirement.
L_C	Confining layer thickness	m	1 to 3	10 to 30	These target values apply to the sub-surface confining layer which separates the UWV from the nearest aquifer.
K_si	Surface hydraulic conductivity	m/s	≤5 × 10⁻⁹	≤5 × 10⁻¹⁰	These variables address infiltration by surface water.
L_Cl	Cap thickness	m	3 to 3.2	3.5 to 5	These target values apply to the surface cap of sediments or soils covering the top of the UWV.
PGA	Peak ground acceleration	% g(m/s²)	9% (0.88)	9% (0.88)	This variable defines the maximum expected seismic energy input through ground shaking.
PGD	Peak ground displacement	m	0.012	0.012	This variable defines the maximum expected size/shape distortion of the UWV created by seismic energy.
V_WBB	Void space around buried wood	Percentage of total volume	25%	50%	Gas containment is maximized if the void space is at least partially filled by loose, smectite-rich clay.

Refer to Figure 1 for physical context.

Abbreviations: g – gravitational acceleration (1 g = 9.81 m/s²); m = meter; s = second; y = year.

Durability is the length of time that sequestered carbon will be isolated from environmental re-circulation.

Monitoring, verification and reporting (for carbon-accounting audits).

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.