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GIS-based Geotechnical Microzonation Mapping using Analytic Hierarchy Process: A case study in Shire-Endasilasie City, Tigray, Northern Ethiopia
Abstract
This study deals with the development of a Geographic Information System (GIS)-based geotechnical microzonation model/map using Analytic Hierarchy Process (AHP) for Shire-Endasilasie, a rapidly growing city in Tigray, northern Ethiopia. The influencing factors considered as inputs for the development of the model are (i) slope gradient, (ii) bed rock and soil type, (iii) swelling potential of soil and (iv) depth to groundwater level. The factors and the classes within each factor are assigned weight and rank values respectively. To avoid subjectivity, the assignment of weight and rank values and the analysis are done by the application of AHP method. From the weight and rank values of the layers, geotechnical suitability indices were calculated using a Weighted Linear Combination (WLC) model in GIS. These continuous numerical index values have been divided into different classes. The classification result implies that the less suitable zone represents the areas that require a detailed geotechnical investigation, the moderately suitable zone represents a provisional settlement area, and the suitable zone represents the areas that are best suitable for settlement.
Keywords: GIS, Analytic Hierarchy Process; Geotechnical microzonation model; Foundation, Shire-Endasilasie,Tigray, Ethiopia.
