Hazard Zones of the Seyresse Natural Risk Prevention Plan (PPRN) – Landes (40)

Area exposed to one or more hazards shown on the hazard map used for risk analysis of the Risk Prevention Plan (RCP). The hazard map is the result of the study of hazards whose objective is to assess the intensity of each hazard at any point in the study area. The assessment method is specific to each type of hazard. It leads to the delimitation of a set of zones on the perimeter of study constituting a graduated zoning 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 spotted 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 specifically) because they are always considered to be subject to hazard (case of rupture or insufficiency of the structure).Hazard zones may be classified as compiled data to the extent that they result from a synthesis using several sources of hazard data calculated, modelled or observed. These source data are not concerned by this class of objects but by another standard dealing with 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 zero. 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 PPRs, regulatory zoning may classify certain areas not exposed to hazard as a prescription zone (see definition of ZonePPR class). Area exposed to one or more hazards shown on the hazard map used for risk analysis of the Risk Prevention Plan (RCP). The hazard map is the result of the study of hazards whose objective is to assess the intensity of each hazard at any point in the study area. The assessment method is specific to each type of hazard. It leads to the delimitation of a set of zones on the perimeter of study constituting a graduated zoning 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 spotted 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 specifically) because they are always considered to be subject to hazard (case of rupture or insufficiency of the structure). Hazard zones may be classified as compiled data to the extent that they result from a synthesis using several sources of hazard data calculated, modelled or observed. These source data are not concerned by this class of objects but by another standard dealing with 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 zero. 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 PPRs, regulatory zoning may classify certain areas not exposed to hazard as a prescription zone (see definition of ZonePPR class).本类指代风险预防计划（Risk Prevention Plan, RCP）风险分析所用灾害地图（hazard map）上标注的、受一种或多种灾害影响的区域。灾害地图是灾害研究的成果，其目标是评估研究区域内任意点位的各类灾害强度。针对不同类型的灾害，需采用专属的评估方法，据此在研究范围边界内划定若干区域，形成基于灾害等级的分级分区体系。对某一特定地域点位的灾害等级赋值时，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，通常会在灾害地图上为每个区域标注其所受各类灾害对应的编码。灾害地图上标注的所有灾害影响区域均纳入本类范畴。受防护结构保护的区域亦需标注（可单独标注），因为即便有防护结构，该区域仍存在受灾害影响的可能（如结构发生破损或防护能力不足时）。若灾害区域是通过整合多源灾害数据（包括计算、建模或观测所得的灾害数据）合成得到的，则可将其归类为汇编数据。此类源数据不属于本类对象的范畴，而应归属于另一项涉及灾害认知的标准。 研究范围边界内的部分区域被视为“零灾害或微灾害区域”，即经研究确认灾害影响为零的区域。此类区域不属于本类对象范畴，无需作为灾害区域进行标注。但对于自然PPRs而言，监管分区可将未受灾害影响的部分区域归类为规定区域（详见ZonePPR类的定义）。 本类指代风险预防计划（Risk Prevention Plan, RCP）风险分析所用灾害地图（hazard map）上标注的、受一种或多种灾害影响的区域。灾害地图是灾害研究的成果，其目标是评估研究区域内任意点位的各类灾害强度。针对不同类型的灾害，需采用专属的评估方法，据此在研究范围边界内划定若干区域，形成基于灾害等级的分级分区体系。对某一特定地域点位的灾害等级赋值时，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，通常会在灾害地图上为每个区域标注其所受各类灾害对应的编码。灾害地图上标注的所有灾害影响区域均纳入本类范畴。受防护结构保护的区域亦需标注（可单独标注），因为即便有防护结构，该区域仍存在受灾害影响的可能（如结构发生破损或防护能力不足时）。若灾害区域是通过整合多源灾害数据（包括计算、建模或观测所得的灾害数据）合成得到的，则可将其归类为汇编数据。此类源数据不属于本类对象的范畴，而应归属于另一项涉及灾害认知的标准。 研究范围边界内的部分区域被视为“零灾害或微灾害区域”，即经研究确认灾害影响为零的区域。此类区域不属于本类对象范畴，无需作为灾害区域进行标注。但对于自然PPRs而言，监管分区可将未受灾害影响的部分区域归类为规定区域（详见ZonePPR类的定义）。