Thresholds in Road Network Functioning on US Atlantic and Gulf Barrier Islands
Thresholds in Road Network Functioning on US Atlantic and Gulf Barrier Islands
复制标题
DOI：
10.1029/2021ef002581
复制
发表时间：
2021-12
期刊：
影响因子：
--
通讯作者：
Sofia Aldabet;E. Goldstein;E. Lazarus
中科院分区：
文献类型：
--
作者：
Sofia Aldabet;E. Goldstein;E. Lazarus
障壁岛在美国大西洋和墨西哥湾海岸线上占主导地位，那里的人口和基础设施增长超过了全国趋势。障壁岛动态的前瞻性模型通常包括房地产市场的反馈和旨在减轻自然灾害对建筑物造成损害的管理实践。然而，迄今为止，此类模型并未考虑道路等基础设施网络，以及基础设施网络的运作如何影响管理策略。了解障壁岛上的基础设施网络是深入了解人类改变障碍的未来动态的重要一步。在这里，我们研究了 72 个美国大西洋和墨西哥湾沿岸障壁岛的功能阈值。我们使用数字高程模型为每个道路网络中的每个交叉口分配高程。从每个道路网络中，我们从最低海拔开始依次删除交叉路口。我们使用第二个巨型连通分量的最大值来识别网络功能失败的特定交叉点和相应的海拔，并将每个关键交叉点的海拔与极端高水位的当地年度超标概率相匹配。我们找到了障壁岛道路网运行的一系列故障阈值，并且还发现没有任何单一指标（绝对高程、年度超越概率或鲁棒性的定量指标）足以对障壁岛道路网故障的敏感性进行排序。未来的工作可以将道路网络的阈值纳入障壁岛动态的前瞻性模型中，其中包括保护基础设施的减灾实践。
Barrier islands predominate the Atlantic and Gulf coastlines of the USA, where population and infrastructure growth exceed national trends. Forward‐looking models of barrier island dynamics often include feedbacks with real estate markets and management practices aimed at mitigating damage to buildings from natural hazards. However, such models thus far do not account for networks of infrastructure, such as roads, and how the functioning of infrastructure networks might influence management strategies. Understanding infrastructure networks on barrier islands is an essential step toward improved insight into the future dynamics of human‐altered barriers. Here, we examine thresholds in the functioning of 72 US Atlantic and Gulf Coast barrier islands. We use digital elevation models to assign an elevation to each intersection in each road network. From each road network we sequentially remove intersections, starting from the lowest elevation. We use the maxima of the second giant connected component to identify a specific intersection—and corresponding elevation—at which functioning of the network fails, and we match the elevation of each critical intersection to local annual exceedance probabilities for extreme high‐water levels. We find a range of failure thresholds for barrier island road network functioning, and also find that no single metric—absolute elevation, annual exceedance probability, or a quantitative metric of robustness—sufficiently ranks the susceptibility of barrier road networks to failure. Future work can incorporate thresholds for road network into forward‐looking models of barrier island dynamics that include hazard‐mitigation practices for protecting infrastructure.