PPRL hazard zone in the Bourret area Boudigau

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 allocation 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 subject to hazard (case of breakage or inadequacy of the structure). Hazard zones can be described as developed data to the extent that they result from a synthesis using multiple sources of calculated, modelled or observed hazard data. These source data are not concerned by this class of objects but by another standard dealing with the knowledge of hazards. Some areas within the study area are considered “no 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).本数据集涵盖的区域，为适用于RPP风险分析的灾害地图（hazard map）所标注的、暴露于一种或多种灾害的区域。 灾害地图是灾害研究的成果，其研究目标为评估研究区域（study area）内任意点位的各类灾害强度。评估方法因灾害类型（hazard type）而异，最终会在研究范围内划定若干区域，形成按灾害等级分级的分区（zoning）体系。在研究区域内的指定点位赋予灾害等级时，需综合考量危险现象（dangerous phenomenon）的发生概率及其强度等级。 对于多随机PPRNs（multi-random PPRNs），灾害地图上的每个分区通常会通过其暴露的各类灾害对应的编码进行标识。 灾害地图上标注的所有灾害区域均需纳入本数据集。受防护结构（protective structures）保护的区域也必须（可采用特定方式）标注出来，因为即便有防护结构，该区域仍可能因结构破损或失效而面临灾害风险。 灾害分区（hazard zones）可被视为衍生数据，其源于对多源计算、建模或观测得到的灾害数据的综合整合。此类源数据不属于该对象类别的涵盖范畴，而是由另一项针对灾害认知的标准进行规范。 研究区域内的部分区域被视为“无灾害或灾害可忽略区域”，即经研究确认无灾害的区域。此类区域不属于该对象类别的涵盖范畴，也无需作为灾害分区进行标注。但对于天然RPP而言，监管分区可能会将部分未暴露于灾害的区域划定为规定区域（详见PPR类别的定义）。