PPRMT Grisy-les-Plâtres (Area 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 multi-random PPRNs, each zone is usually identified on the hazard map by a code for each hazard to which it is exposed. All hazard areas shown 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. However, in the case of natural RPPs, regulatory zoning may classify certain areas not exposed to hazard as prescribing areas (see definition of the PPR class).本数据集对应用于RPP风险分析的灾害地图中所标注的、受一种或多种灾害影响的区域。本灾害地图为灾害研究的成果，其研究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，可在研究区域范围内划定一系列按灾害等级分级的区域。对辖区内特定点位赋予灾害等级时，需综合考量该危险现象的发生概率及其强度等级。针对多随机PPRNs，各区域通常会在灾害地图上通过其所受灾害对应的编码进行标识。灾害地图上标注的所有灾害影响区域均纳入本数据集范畴。受防护结构保护的区域也必须予以标注（可采用特定方式），因为即便设有防护结构，仍存在结构破损或失效而引发灾害影响的可能。灾害区域可归类为经整合的数据范畴，前提是其基于计算、建模或观测得到的多源灾害数据综合生成。此类源数据不属于本对象类别的范畴，而是由另一项针对灾害认知的标准进行规范。研究区域范围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。此类区域不属于本对象类别的范畴，也无需作为灾害区域进行标注。但针对天然RPPs，监管分区可能将未受灾害影响的特定区域划定为规定区域（详见PPR类别的定义）。