Simple download service (Atom) of the dataset: Risks of the PPRi of the Loing Valley, Montargoe and farther downstream

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).

本数据集对应用于RPP风险分析的灾害地图上标注的、遭受一种或多种灾害影响的区域。该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的各类灾害强度。不同灾害类型对应专属评估方法，据此可在研究范围内划定一系列区域，形成按灾害等级分级的分区体系。在研究区域内的任意给定点位分配灾害等级时，需综合考量危险现象的发生概率及其强度等级。
针对多随机PPRNs，灾害地图上的每个分区通常会通过代码标记其暴露的各类灾害类型。灾害地图上标注的所有灾害区域均需纳入本数据集范畴。受防护结构保护的区域同样必须予以标注（可采用特定标注方式），因为即便防护结构发生破损或性能不足，该区域仍会被认定处于灾害威胁之中。
灾害分区可作为派生数据进行描述，其生成基础为整合多源经计算、建模或观测得到的灾害数据。本数据集的对象类不涉及上述源数据，相关内容由另一项专注于灾害认知的标准规范予以定义。研究区域内部分区域被划定为“无灾害或灾害影响可忽略区域”，即经全面研究确认无灾害影响的区域，此类区域不属于本对象类的范畴，也无需作为灾害分区进行标注。但在天然RPP场景下，监管分区可能将未受灾害影响的区域划定为规定执行区域（详见PPR类别的定义）。