PPRT North Amiens Hazard Area

Area exposed to one or more hazards represented on the hazard map used for risk analysis of the RPP. The hazard map is the result of the study of hazards, the objective of which is to assess the intensity of each hazard at any point in the study area. The evaluation method is specific to each hazard type. It leads to the delimitation of a set of areas on the study perimeter constituting a zoning graduated according to the level of the hazard. The assignment of a hazard level at a given point in the territory takes into account the probability of occurrence of the dangerous phenomenon and its degree of intensity.For PPRTs the hazard levels are determined by effect effect on maps by type of effect and overall on an aggregated level on a synthesis map.All hazard areas represented on the hazard map are included. Areas protected by protective structures must be represented (possibly in a specific way) as they are always considered to be subject to hazard (cases of breakage or inadequacy of the structure).The hazard zones may be classified as data compiled in so far as they result from a synthesis using several sources of calculated, modelled or observed hazard data. These source data are not covered by this class of objects but by another standard dealing with the knowledge of hazards.Some areas of the study perimeter are considered “zero or insignificant hazard zones”. These are the areas where the hazard has been studied and is nil. These areas are not included in the object class and do not have to be represented as hazard zones.本类对象指用于RPP风险分析的灾害地图（hazard map）上标注的、受一种或多种灾害影响的区域。该灾害地图源于灾害研究，其核心目标为评估研究区域内任意点位处各类灾害的强度。评估方法因灾害类型而异，可基于灾害等级对研究范围边界内的多个区域进行划分，形成分级分区。针对辖区内指定点位的灾害等级赋值时，需综合考量该危险现象的发生概率及其强度等级。针对PPRTs，灾害等级需按效应类型在地图上标注，并在综合地图（synthesis map）上以聚合层级完成整体判定。灾害地图上标注的所有灾害区域均纳入本类对象范畴。受防护结构保护的区域也必须标注（可采用特定标注方式）——即便设置了防护结构，仍存在结构破损或防护失效的可能，此类区域始终被视为处于灾害影响范围内。若灾害分区数据源于对多源计算、建模或实测灾害数据的综合整合，则可对其进行分类。上述源数据不属于本类对象范畴，而是由另一项针对灾害认知的标准进行规范。研究范围边界内的部分区域被视为“零灾害或微灾害区域”，即经研究确认无灾害影响的区域。此类区域不属于本类对象范畴，无需作为灾害区域进行标注。