Detecting peatland drains with Object Based Image Analysis and Geoeye-1 imagery

Table 1 Emission Factors for six scenarios (t CO₂ eq. ha⁻¹ year⁻¹) and study area fluxes (t CO₂ eq.) with estimated costs of re-wetting vs business as usual

	Intact Blanket bogA^c	Intact Blanket bogB^d	DBAU^{a, e}	MDBAU^{b, f}	Re-wetA^g	Re-wetB^h
CO₂	−0.48	−2.12	1.40	1.14	0.04	−1.04
CH₄	0.04	1.73	2.00	2.00	1.73	0.09
DOC	0.14	0.14	1.00	1.00	0.14	0.14
Emission factor	−0.30	−0.25	4.40	4.14	1.91	−0.81
Study area (t CO₂ eq.)	−357	−301	5294	4984	2298	−975
EU ETS rate: €5.48ⁱ
Drain blocking^j	€0	€0	€0	€0	€486,100	€486,100
Annual emission costs	−€1,958^k	−€1648	€29,010	€27,312	€12,593	−€5340
Initial cost (€) year 1	−€1958	−€1648	€29,010	€27,312	€498,693	€480,759
Total costs (year 30)^l	−€58,744	−€49,448	€870,288	€819,356	€863,884	€325,888

^aDrained/business as usual
^bMapped drains/ business as usual
^cCO₂, CH₄ and DOC derived from Koehler et al. [65]
^dCO₂ derived from Bonn et al. [69] and CH₄ IPCC Tier 1 [70] and DOC from Koehler et al. [65]
^eCO₂ and CH₄ derived from Reed et al. [66] and DOC from Evans et al. [26]
^fCO₂ derived in this study using figures from Wilson et al. [67, 68], CH₄ Reed et al. [66] and DOC Evans et al. [26]
^gCO₂ and CH₄ from Bonn et al. [69] and IPCC Tier 1. [70] and DOC from Koehler [65]
^hCO₂ and CH₄ from Wilson et al. [71] and DOC from Koehler et al. [65]
ⁱ€5.48 per tonne CO₂ (21/11/2016—https://carbon-pulse.com/category/eu-ets/)
^jIncludes the cost of OBIA (€4852) and cost of blocking drains (€481,247) at €400/ha*1203 ha
^kThe minus value indicates the amount that is saved by not draining peatlands
^lThe total costs equals the initial year 1 cost plus the annual emission cost multiplied by 29

ISSN: 1750-0680