Integrating knowledge-based multi-criteria evaluation techniques with GIS for landfill site selection: A case study using AHP

Abstract

A major challenge in most growing urban areas of developing countries, without a pre-existing land use plan is the sustainable and efficient management of solid wastes. Siting a landfill is a complicated task because of several environmental regulations. This challenge gives birth to the need to develop efficient strategies for the selection of proper waste disposal sites in accordance with all existing environmental regulations. This paper presents a knowledge-based multi-criteria decision analysis using GIS for the selection of suitable landfill site in Ado-Ekiti, Nigeria. In order to identify suitable sites for landfill, seven factors -land use/cover, geology, river, soil, slope, lineament and roads -were taken into consideration. Each factor was classified and ranked based on prior knowledge about the area and existing guidelines. Weights for each factor were determined through pair-wise comparison using Saaty's 9 point scale and AHP. The integration of factors according to their weights using weighted index overlay analysis revealed that 39.23 km 2 within the area was suitable to site a landfill. The resulting suitable area was classified as high suitability covering 6.47 km 2 (16.49%), moderate suitability 25.48 km 2 (64.95%) and low suitability 7.28 km 2 (18.56%) based on their overall weights.Key words: landfill, GIS, AHP, environmental management, spatial planning IzvlečekPomembna naloga v mnogih hitro rastočih mestnih naselbinah v deželah v razvoju, ki nimajo izdelanega plana rabe prostora, je zagotoviti trajnostno in učinko-vito ravnanje s trdnimi odpadki. Izbira lokacije ni lahka spričo zapletene okoljske zakonodaje. Odtod izvira potreba po izdelavi učinkovitih scenarijev izbiranja primernih odlagališč v skladu z vso obstoječo okoljsko regulativo. V tem članku poročamo o na znanju utemeljeni mnogokriterijski analizi, opravljeni v povezavi z geografskim informacijskim sistemom (GIS) za izbiro primerne lokacije odlagališča v nigerijskem mestu Ado--Ekiti. Pri izbiri so upoštevali sedem faktorjev -uporabnost, geološko sestavo, rečno mrežo, vrsto tal, nagib zemljišča, razpokanost kamnine in cestno omrežje. Vsak faktor so razdelili na razrede in ga rangirali glede na poprejšnje poznavanje ozemlja in obstoječe smernice. Posameznim faktorjem so pripisovali uteži s po-parnim primerjanjem ob uporabi Saatyjeve 9 stopenjske lestvice in hierarhične analizne metode (AHP). Z integracijo faktorjev glede na njihove uteži ob uporabi utežne indeksne analize podatkovnih slojev so ugotovili, da je 39,23 km 2 preiskovane površine primerno za lociranje odlagališča. Na tej površini so opredelili z ozirom na vse faktorje za zelo primerno 6,47 km 2 (16,49 %), zmerno primerno 25,48 km 2 (64,95 %) in malo primerno 7,28 km 2 (18,56 %) zemljišča.Ključne besede: odlagališče odpadkov, geografski informacijski sistem, hierarična analizna metoda, okoljska analiza, prostorsko načrtovanje

The Effect of Spatial Differences on the Quality of Urban Life a Comparative Analytical Study of Three Cities in the High Plateaux Region of Algeria

“…After the hierarchy is established, the relative importance of all precision components will be captured and detected by binary comparisons, which in turn are used to construct the ratio matrix. Binary comparisons are then made between the six major criteria and the sub criteria within the same hierarchical level, working to use the numerical scale as suggested by (Saaty), which ranges from 1 to 9, (Table 1) (Fagbohun and Aladejana, 2016); (Ouma and Tateishi, 2014).…”

Application of GIS-based multi-criteria decision making analysis (GIS-MCDA) in selecting locations most suitable for siting engineered landfills – the case of Ashanti Region, Ghana

“…One of the key challenges confronting both less and developed countries is solid waste management (Fagbohun and Aladejana, 2016;Chamchali and Ghazifard, 2021;Makonyo and Msabi, 2021;Callas et al, 1996). The rapidly evolving nature of urban space, coupled with poor governance and spatial planning have resulted to indiscriminate waste disposal behaviors (Mwaguni et al, 2015).…”

“…In fact, these problems associated with improper waste management have been burdening the human race for centuries and still growingwith ever increasing human population (Jankowska et al, 2011;Kinobe et al, 2015). Even though different forms of solid waste management approaches have been developed over the past decades to manage solid waste, including recycling, landfill siting still remains central in many countries (Fagbohun and Aladejana, 2016) and has remained an integral part of European waste management system (Elhag and Bahrawi, 2017).…”

“…One of the key challenges confronting both less and developed countries is solid waste management (Fagbohun and Aladejana, 2016; Chamchali and Ghazifard, 2021; Makonyo and Msabi, 2021; Callas et al. , 1996).…”

“…, 2015). Even though different forms of solid waste management approaches have been developed over the past decades to manage solid waste, including recycling, landfill siting still remains central in many countries (Fagbohun and Aladejana, 2016) and has remained an integral part of European waste management system (Elhag and Bahrawi, 2017).…”