Long Jordan, Giri Chandra, Primavera Jurgenne, Trivedi Mandar
InuTeq(1), Sioux Falls, SD 57198, USA.
U.S. Geological Survey EROS Center, Sioux Falls, SD 57198, USA.
Mar Pollut Bull. 2016 Aug 30;109(2):734-43. doi: 10.1016/j.marpolbul.2016.06.080. Epub 2016 Jul 7.
We quantified mangrove disturbance resulting from Super Typhoon Haiyan using a remote sensing approach. Mangrove areas were mapped prior to Haiyan using 30m Landsat imagery and a supervised decision-tree classification. A time sequence of 250m eMODIS data was used to monitor mangrove condition prior to, and following, Haiyan. Based on differences in eMODIS NDVI observations before and after the storm, we classified mangrove into three damage level categories: minimal, moderate, or severe. Mangrove damage in terms of extent and severity was greatest where Haiyan first made landfall on Eastern Samar and Western Samar provinces and lessened westward corresponding with decreasing storm intensity as Haiyan tracked from east to west across the Visayas region of the Philippines. However, within 18months following Haiyan, mangrove areas classified as severely, moderately, and minimally damaged decreased by 90%, 81%, and 57%, respectively, indicating mangroves resilience to powerful typhoons.
我们采用遥感方法对超级台风海燕造成的红树林干扰进行了量化。在海燕来袭之前，利用30米分辨率的陆地卫星图像和监督决策树分类法绘制了红树林区域图。利用一系列250米分辨率的增强型中分辨率成像光谱仪（eMODIS）数据监测海燕来袭前后的红树林状况。根据风暴前后eMODIS归一化植被指数（NDVI）观测值的差异，我们将红树林分为三个受损等级类别：轻微、中度或严重。就范围和严重程度而言，海燕首次登陆的东萨马省和西萨马省的红树林受损最为严重，随着海燕从东向西穿越菲律宾米沙鄢群岛地区，风暴强度减弱，红树林受损程度向西逐渐减轻。然而，在海燕过后的18个月内，被归类为严重、中度和轻微受损的红树林面积分别减少了90%、81%和57%，这表明红树林对强台风具有恢复能力。
