2024-08-13 オークリッジ国立研究所(ORNL)
＜関連情報＞
- https://www.ornl.gov/news/hurricane-season-has-anyone-checked-beach
- https://www.mdpi.com/2072-4292/16/9/1557
ハリケーン「イアン」と「ニコル」の影響に関するデータ主導の評価：フロリダ州東海岸中央部におけるハリケーンの余波を受けた自然砂丘と護岸砂丘 Data-Driven Assessment of the Impact of Hurricanes Ian and Nicole: Natural and Armored Dunes in the Aftermath of Hurricanes on Florida’s Central East Coast
Kelly M. San Antonio,Daniel Burow,Hyun Jung Cho,Matthew J. McCarthy,Stephen C. Medeiros,Yao Zhou and Hannah V. Herrero
Remote Sensing Published: 27 April 2024
DOI:https://doi.org/10.3390/rs16091557
Graphical Abstract
Abstract
Hurricanes Ian and Nicole caused devastating destruction across Florida in September and November 2022, leaving widespread damage in their wakes. This study focuses on the assessment of barrier islands’ shorelines, encompassing natural sand dunes and dune vegetation as well as armored dunes with man-made infrastructure such as seawalls. High-resolution satellite imagery from Planet was used to assess the impacts of these hurricanes on the beach shorelines of Volusia, Flagler, and St. Johns Counties on the Florida Central East Coast. Shorefront vegetation was classified into two classes. Normalized Difference Vegetation Index (NDVI) values were calculated before the hurricanes, one month after Hurricane Ian, one month after Hurricane Nicole, and one-year post landfall. LiDAR (Light Detection and Ranging) was incorporated to calculate vertical changes in the shorelines before and after the hurricanes. The results suggest that natural sand dunes were more resilient as they experienced less impact to vegetation and elevation and more substantial recovery than armored dunes. Moreover, the close timeframe of the storm events suggests a compound effect on the weakened dune systems. This study highlights the importance of understanding natural dune resilience to facilitate future adaptive management efforts because armored dunes may have long-term detrimental effects on hurricane-prone barrier islands.
