Plan to prevent the natural risks of landslide — Commune de Reyniès — Zone d’alas — Department of Tarn-et-Garonne.

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 type of hazard. 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. Award

from a hazard level to 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

specific) because they are always considered to be subject to hazard (case of breakage or inadequacy of the work).
Hazard zones may be described as data compiled to the extent that they result from a synthesis using multiple calculated hazard data sources,

modelled or observed. 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 in a prescribing zone (see definition of Class PPR).

本类数据集对应RPP风险分析所用灾害地图中标注的、受一种或多种灾害影响的区域。
灾害地图源于灾害专项研究，其核心目标为评估研究区域内任意点位的各类灾害强度。不同灾害类型的评估方法具有特异性，据此可在研究范围内划定若干区域，形成按灾害等级分级的分区方案。为区域内任意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，灾害地图上的每个分区通常会通过其受影响的各类灾害对应的专属编码进行标识。
本类数据集涵盖灾害地图上标注的全部灾害影响区域。受防护结构保护的区域也需纳入标注（可采用专属标识），因为即便设置了防护结构，此类区域仍可能因结构破损或功能失效而面临灾害风险。
灾害影响区域的数据可通过整合多源灾害计算、建模或实测数据综合生成。本类对象仅涵盖整合后的成果数据，原始源数据的管理需遵循其他灾害认知相关标准。
研究区域内部分区域被划为“无灾害或灾害影响可忽略区域”，即经专项研究确认无灾害风险的区域。此类区域不属于本类对象范畴，无需作为灾害影响区域进行标注。
但针对天然RPP，监管分区可能会将部分未受灾害影响的区域划入规定管控区域（详见PPR类别的定义）。