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Identifying marsh dieback events from Landsat image series (1998–2018) with an Autoencoder in the NIWB estuary, South Carolina
International Journal of Digital Earth ( IF 5.1 ) Pub Date : 2020-02-20 , DOI: 10.1080/17538947.2020.1729263
Huixuan Li 1 , Cuizhen Wang 1 , Jean T. Ellis 1 , Yuxin Cui 2 , Gwen Miller 3 , James T. Morris 4
Affiliation  

ABSTRACT

This study reports an inventory of marsh dieback events from spatial and temporal perspectives in the North Inlet-Winyah Bay (NIWB) estuary, South Carolina (SC). Past studies in the Gulf/Atlantic coast states have reported acute marsh dieback events in which marsh rapidly browned and thinned, leaving stubble of dead stems or mudflat with damaged ecosystem services. Reported marsh dieback in SC, however, have been limited. This study identified all marsh dieback events in the estuary since 1998. With 20 annually collected Landsat images, the Normalized Difference Vegetation Index (NDVI) series was extracted. A Stacked Denoising Autoencoder neural network was developed to identify the NDVI anomalies on the trajectories. All marsh dieback patches were extracted, and their inter-annual changes were examined. Results showed a continuous, spatially variable multi-year dieback event in 1998–2005, which aligned with the reported dieback in the early 2000s from other states. The identified patches mostly returned to normal within one year while the phenomenon reoccurred in other areas of the estuary during the prolonged dieback period. This study presents the first attempt to explore long-term dieback dynamics in an estuary using satellite time series. It provides valuable information in documenting marsh healthiness and environmental resilience on SC coasts.



中文翻译:

在南卡罗来纳州NIWB河口使用自动编码器识别Landsat图像系列(1998–2018)中的沼泽死亡事件

这项研究报告了从南北卡罗莱纳州南入口-威亚湾(NIWB)入海口的时空分布来看的沼泽死亡事件清单。过去在海湾/大西洋沿岸各州的研究报告说,沼泽发生了严重的枯死事件,其中沼泽迅速变褐变稀,留下了枯死的茎秆或泥泞的土地,破坏了生态系统服务。然而,据报道南卡罗来纳州的沼泽死亡人数有限。这项研究确定了1998年以来河口内的所有沼泽死亡事件。利用每年收集的20张Landsat影像,提取了归一化植被指数(NDVI)系列。开发了堆叠式降噪自动编码器神经网络来识别轨迹上的NDVI异常。提取所有沼泽地死斑块,并检查其年际变化。结果显示,1998年至2005年的空间可变的多年不育事件,与其他州在2000年代初报道的不育事件一致。所发现的斑块大部分在一年之内恢复正常,而在延长的枯萎期期间该现象又在河口其他地区再次发生。这项研究提出了使用卫星时间序列探索河口长期回缩动态的首次尝试。它为记录SC海岸的沼泽健康状况和环境复原力提供了有价值的信息。这项研究提出了使用卫星时间序列探索河口长期回缩动态的首次尝试。它为记录SC海岸的沼泽健康状况和环境复原力提供了有价值的信息。这项研究提出了使用卫星时间序列探索河口长期回缩动态的首次尝试。它为记录SC海岸的沼泽健康状况和环境复原力提供了有价值的信息。

更新日期:2020-02-20
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