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Coastal areas are subject to flood hazards because of their topographic\udfeatures, social development and related human activities. The Kujukuri\udPlain, Chiba Prefecture, Japan, is located nearby the Tokyo metropolitan\udarea and it faces to the Pacific Ocean. In the Kujukuri Plain, widespread\udoccurrence of land subsidence has been caused by exploitation of\udgroundwater, extraction of natural gas dissolved in brine, and natural\udconsolidation of the Holocene and landfill deposits. The locations of land\udsubsidence include areas near the coast, and it may increase the flood\udhazard potential. Hence, it is very important to evaluate flood hazard\udpotential by taking into account the temporal change of land elevation\udcaused by land subsidence, and to prepare hazard maps for protecting the\udsurface environment and for developing an appropriate land-use plan. In this\udstudy, flood hazard assessments at three different times, i.e., 1970, 2004,\udand 2013 are implemented by using a flood hazard model based on\udMulticriteria Decision Analysis with Geographical Information System\udtechniques. The model incorporates six factors: elevation, depression area,\udriver system, ratio of impermeable area, detention ponds, and precipitation.\udMain data sources used are 10 m resolution topography data, airborne\udlaser scanning data, leveling data, Landsat-TM data, two 1:30 000 scale\udriver watershed maps, and precipitation data from observation stations\udaround the study area and Radar data. The hazard assessment maps for each\udtime are obtained by using an algorithm that combines factors with weighted\udlinear combinations. The assignment of the weight/rank values and their\udanalysis are realized by the application of the Analytic Hierarchy Process\udmethod. This study is a preliminary work to investigate flood hazards on the\udKujukuri Plain. A flood model will be developed to simulate more detailed\udchange of the flood hazard influenced by land subsidence

Has land subsidence changed the flood hazard potential? A case example from the Kujukuri Plain, Chiba Prefecture, Japan