Analytic Hierarchy Process (AHP) for a Landfill Site Selection in Chachapoyas and Huancas (NW Peru): Modeling in a GIS-RS Environment

Table 1

Suitability thresholds of the subcriteria to model the suitability of areas in the territory of Chachapoyas and Huancas (NW Peru) for landfills.

Criteria/subcriteria	Unsuitable (S1)	Marginally suitable (S2)	Moderately suitable (S3)	Highly suitable (S4)	Adapted from
Physical
Elevation (m.a.s.l)	750–1000; >3200	2800–3200	1000–2000	2000–2800	[35]
Slope (%)	>35	25–35	15–25	0–15	[49, 59, 60]
Soil texture^1	L, SaL, SiL, Sa, SaC	CL, CSiL	CSi, Si	C	[9]
Proximity to geological fault (km)	<0.3	0.3–1	1–2	>2	[18, 33, 49]
Mean annual rainfall (mm)	>2450	1200–2450	400–1200	<400	[36]
Average annual temperature (°C)	<11	11–14	14–17	17–21	[49]
Geology type^2	Ci-a, Q-d	Chi-a, Tr-ch, Js-s, N-i, Chi-c, Q-al, Jms-c, Ps-m	Ki-g, Q-co	Ki-ch, Ks-p	[17]
Environmental
Proximity to a water source (km)	<0.3	0.3–0.5	0.5–1	>1	[51]
Proximity to PNA (km)	—	0–0.5	0.5–2	>2	[7, 60]
LULC	Forest; water bodies	Scrublands	Pastures and crops	Bare soil	[16, 18, 60]
Socioeconomic
Proximity to access to roads (km)	<0.2 > 2	1–2	0.5–1	0.2–0.5	[59, 61]
Proximity to urban areas (km)	<0.5	0.5–1	1–2	>2	[51]
Proximity to tourist centers (km)	<0.5	0.5–1	1–2	>2	[50]
Proximity to the airport (km)	<3	3–3.5	3.5–4.5	>4.5	[51, 60]

¹ L: loam; SaL: sandy loam; SiL: silty loam; CL: clay loam; CSiL: clay-silt loam; SaC: sand clay; Sa: sand; C: clay; CSi: clay silt; LSa: loam sand; Si: silt. ² ki-g: Gollanquizga; Ji-a: Aramachasy; Tr-ch: Cahmbara; Js-s: Forma. Sayaraquillo; Ki-ch: Chulec; N-i: Form. Inguilpata; Ji-c: Condorsinga; Q-al: Deposito aluvial; Jms-c: Form. Corontacocha; Q-co: Deposicos coluviales; Q-d: Depósitos de deslizaminetos; Ps-m: Grupo Mito; Ks-p: Gpto Pulluicana; Ci-a: Grupo Ambo.