Evaluation of the carbon sink potential of wooden foundation piles embedded in oxygen-depleted soils using density profile analysis

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Official Journal of the Japan Wood Research Society

Table 1 Characteristics of the investigated piles

Group name	Piles name	Prefecture	City or Ward	Diameter (cm)	Length (m)	Species	Estimated residence time (years)	Number of piles	Remarks
pine-Fukui	Fukui	Fukui	Obama	23–25	6.5–7.0	Pine	83	4	a
pine-Tokyo	Tokyo-a	Tokyo	Sumida	11	1.0	Pine	80	1	b
pine-Tokyo	Tokyo-b	Tokyo	Koto	15–18	1.9–2.7	Pine	60	2	c
pine-Tokyo	Tokyo-c	Tokyo	Ota	15–17	4.2	Pine	84	3	d
cedar	Saga	Saga	Saga	15–17	4.0	Cedar	11	2	e
cedar	Mie	Mie	Matsusaka	16–20	1.8	Cedar	8	4	f
larch	Chiba	Chiba	Kisarazu	17–18	4.0	Larch	10	3	g

a: The piles were used for a foundation under riverbanks. Two of the four piles were taken from the right bank, and the remaining two were taken from the left bank of the same river
b: The piles were used for the foundation of a building. An undamaged portion of the pile was extracted without ropes. The larger side was regarded as the top
c: The piles were used for the foundation of a building. The soil surrounding the piles had a creosote-like smell. The estimated residence time was determined on the basis of historical aerial photographs
d: The piles were used for the foundation of a building. The regions of three piles, which were residues of another study, were used
e: The piles were used for creek bank stabilization. Because the tops of the piles were exposed to the air and were degraded heavily by termites, the middle and bottom sections were used for investigation
f: The piles were used under an asphalt paving project to prevent liquefaction. Although the top section of one pile was covered with a ceramic resin cap, the presence or absence of the cap was not considered in the statistical analysis
g: The piles were buried in a sandy substrate to counteract the effects of liquefaction