Coastal Erosion Decision Problems Using Interval Type-2 Fuzzy Analytic Hierarchy Process (it2-fahp)

Development of coastal area for various economic activities such as agriculture, tourism and industrial facilities and recreational areas is inevitable. These activities may indirectly contribute to accelerated coastal erosion. Economic activities imply a pressure on natural environment for the case of coastal zones. In addition, environmental changes such as climate change, tidal wave, wind and sea level rise also may affect the erosion. There are many other intangible risks that contributed to coastal erosion. It seems that these multiple risks act simultaneously to deteriorate the situation. Thus, this paper aims to investigate thirteen selected alternatives related to coastal erosion hazards using Interval Type-2 Fuzzy Analytic Hierarchy Process (IT2-FAHP) method. The IT2-FAHP procedure includes the rank normalization steps, decision makers averaging weights and an application of trapezoidal interval type-2 fuzzy numbers. The decision makers were asked to judge the comparison matrices with respect to both criterion and alternatives involved. As a conclusion, the risk factor selected for the erosion problems is shoreline evolution with the highest percentage (8.21%) compared to the others alternatives.