Surfacial issue of the Montdidier PPRM

Generally speaking, the stakes are people, property, activities, cultural or environmental heritage elements, threatened by a hazard and likely to be affected or damaged by it. The sensitivity of an issue to a hazard is called “vulnerability.”This object class brings together all the issues that have been addressed in the RPP study. An issue is a dated object whose consideration depends on the purpose of the RPP and its vulnerability to the hazards studied. A PPR issue can therefore be considered (or not) depending on the type or types of hazard being addressed. These elements form the basis of knowledge of the land cover necessary for the development of the RPP, in the study area or near it, at the time of the analysis of the issues. The data on the issues represent a photograph (figential and not exhaustive) of the property and of the people exposed to hazards at the time of the development of the risk prevention plan. This data is not updated after approval of the RPP. In practice they are no longer used: the issues are recalculated as necessary with up-to-date data sources.

简言之，承险体指受灾害威胁、并可能因此遭受影响或损毁的人员、资产、活动、文化或环境遗产要素。某一风险要素对灾害的敏感程度即被定义为脆弱性（vulnerability）。本对象类别涵盖了风险预防计划（RPP, Risk Prevention Plan）研究中涉及的全部风险要素。风险要素是一类带有时间标记的对象，其是否被纳入考量取决于风险预防计划的目标，以及其针对所研究灾害的脆弱性水平。因此，风险预防计划相关风险要素是否被纳入评估，取决于当前所针对的灾害类型。在开展风险要素分析阶段，上述要素构成了研究区域及周边区域风险预防计划编制所需的土地覆盖认知基础。该类风险要素数据仅为风险预防计划编制阶段，受灾害威胁的资产与人员的（示意性且非穷尽）快照。该类数据在风险预防计划获批后不再更新。实际应用中该类数据亦不再直接使用，而是根据需求依托最新数据源重新计算得到风险要素相关信息。