2024-01-02 バージニア工科大学(VirginiaTech)
◆特にニューヨーク市、ロングアイランド、ボルチモア、バージニアビーチ、ノーフォークなどは急激な沈降が見られ、道路、滑走路、建物基礎、鉄道、パイプラインなどのインフラに影響を与え、海面上昇と組み合わさることで洪水のリスクが高まる可能性がある。研究者は、宇宙からのレーダーサテライトデータを用いて、高精度の地形マップを作成し、東海岸の広範な地域で沈降が進行中であることを明らかにした。
＜関連情報＞
- https://news.vt.edu/articles/2024/01/COS-PNAS-subsidence.html
- https://academic.oup.com/pnasnexus/article/3/1/pgad426/7504900?login=false
ゆっくりと、しかし確実に： 米国東海岸における地盤沈下への地域社会とインフラの暴露 Slowly but surely: Exposure of communities and infrastructure to subsidence on the US east coast
Leonard O Ohenhen, Manoochehr Shirzaei, Patrick L Barnard
PNAS Nexus Published:02 January 2024
DOI:https://doi.org/10.1093/pnasnexus/pgad426
Abstract
Coastal communities are vulnerable to multihazards, which are exacerbated by land subsidence. On the US east coast, the high density of population and assets amplifies the region’s exposure to coastal hazards. We utilized measurements of vertical land motion rates obtained from analysis of radar datasets to evaluate the subsidence-hazard exposure to population, assets, and infrastructure systems/facilities along the US east coast. Here, we show that 2,000 to 74,000 km2 land area, 1.2 to 14 million people, 476,000 to 6.3 million properties, and >50% of infrastructures in major cities such as New York, Baltimore, and Norfolk are exposed to subsidence rates between 1 and 2 mm per year. Additionally, our analysis indicates a notable trend: as subsidence rates increase, the extent of area exposed to these hazards correspondingly decreases. Our analysis has far-reaching implications for community and infrastructure resilience planning, emphasizing the need for a targeted approach in transitioning from reactive to proactive hazard mitigation strategies in the era of climate change.
