Moita-Montijo Bay saltmarsh and tidal flat change rates (1958-2018)

Saltmarsh and tidal flat change rates were determined for the period of 1958 to 2018, for the Moita-Montijo Bay (Tagus Estuary, Portugal). Rates were determined only for the exposed saltmarsh. No rates were calculated for sheltered saltmarsh (saltmarsh inside abandoned saltpans and similar structures). Saltmarsh margins were delineated in ArcMap, using, as the carthographic basis, orthorectified aerial photgraphs from 1958 and orthophotomaps from 1995 and 2018 (from Direção Geral do Território (DGT)). Tidal flat change rates were determined for the period of 1977 to 2018, in the north and south banks of the Montijo Channel (Moita-Montijo Bay, Tagus Estuary, Portugal). Rates were determined only for the Montijo Channel margins. The tidal flat margins were delineated in ArcMap, using, as the carthographic basis, orthorectified aerial photgraphs from 1977 and orthophotomaps from 1995 and 2018 (from DGT). The Digital Shoreline Analysis System (DSAS) in ArcMap was used to calculate the End Point Rates (EPR) between the margins (See Himmelstoss et al. (2018) for details on how to the EPR is calculated using DSAS). This dataset was produced in the scope of the Project Planta II*. Further details can be consulted in Martins et al. (2023). Dataset: Saltmarsh change rates in the Moita-Montijo Bay (1958 to 1995) (Tagus Estuary, Portugal) = rates_smarsh_moitamontijobay_1958_1995.shp Saltmarsh change rates in the Moita-Montijo Bay (1995 to 2018) (Tagus Estuary, Portugal) = rates_smarsh_moitamontijobay_1995_2018.shp Tidal flat change rates in the north bank of the Montijo Channel (1977 to 1995) (Moita-Montijo Bay, Tagus Estuary, Portugal) = rates_tf_nb_moitamontijobay_1977_1995.shp Tidal flat change rates in the north bank of the Montijo Channel (1995 to 2018) (Moita-Montijo Bay, Tagus Estuary, Portugal) = rates_tf_nb_moitamontijobay_1995_2018.shp Tidal flat change rates in the south bank of the Montijo Channel (1977 to 1995) (Moita-Montijo Bay, Tagus Estuary, Portugal) = rates_tf_sb_moitamontijobay_1977_1995.shp Tidal flat change rates in the south bank of the Montijo Channel (1995 to 2018) (Moita-Montijo Bay, Tagus Estuary, Portugal) = rates_tf_sb_moitamontijobay_1995_2018.shp Please cite the paper where this dataset is discussed as Martins, D., Alves da Silva, A., Duarte, J., Canário, J., &amp; Vieira, G. (2023). Changes in vessel traffic disrupt tidal flats and saltmarshes in the Tagus Estuary, Portugal. <em>Estuaries and Coasts</em>. DOI: https://doi.org/10.1007/s12237-023-01198-7 *Project Planta II - PTDC/CTA-GQU/31208/2017, co-funded by the European Regional Development Fund (ERDF), through the financing Regional Operational Program of Lisbon, and by the Portuguese Science and Technology Foundation (FCT), through the national funds (PIDDAC).本数据集针对葡萄牙塔霍河口的莫伊塔-蒙蒂茹湾，测算了1958—2018年期间的盐沼与潮滩变化速率。本次测算仅覆盖裸露盐沼，未针对遮蔽型盐沼（即废弃盐田及同类人工结构内部的盐沼）计算变化速率。 盐沼边界通过ArcMap软件进行数字化勾绘，制图基准采用1958年的正射校正航空影像，以及1995年、2018年的正射影像图，数据来源于葡萄牙领土总局（Direção Geral do Território，DGT）。 潮滩变化速率的测算时段为1977—2018年，研究范围为蒙蒂茹水道南北两岸的莫伊塔-蒙蒂茹湾区域，测算仅针对蒙蒂茹水道沿岸的潮滩区域。潮滩边界同样通过ArcMap软件数字化勾绘，制图基准采用1977年的正射校正航空影像，以及1995年、2018年的正射影像图，数据来源于DGT。 本研究采用ArcMap中的数字岸线分析系统（Digital Shoreline Analysis System，DSAS）计算不同时期岸线边界间的端点速率（End Point Rates，EPR）；关于使用DSAS计算EPR的详细方法，请参见Himmelstoss等（2018）的相关研究。 本数据集依托Planta II项目编制完成，更多详细信息可参阅Martins等（2023）的研究成果。 本数据集包含以下矢量数据文件： 1. 葡萄牙塔霍河口莫伊塔-蒙蒂茹湾盐沼变化速率数据集（1958—1995年）：rates_smarsh_moitamontijobay_1958_1995.shp 2. 葡萄牙塔霍河口莫伊塔-蒙蒂茹湾盐沼变化速率数据集（1995—2018年）：rates_smarsh_moitamontijobay_1995_2018.shp 3. 葡萄牙塔霍河口莫伊塔-蒙蒂茹湾蒙蒂茹水道北岸潮滩变化速率数据集（1977—1995年）：rates_tf_nb_moitamontijobay_1977_1995.shp 4. 葡萄牙塔霍河口莫伊塔-蒙蒂茹湾蒙蒂茹水道北岸潮滩变化速率数据集（1995—2018年）：rates_tf_nb_moitamontijobay_1995_2018.shp 5. 葡萄牙塔霍河口莫伊塔-蒙蒂茹湾蒙蒂茹水道南岸潮滩变化速率数据集（1977—1995年）：rates_tf_sb_moitamontijobay_1977_1995.shp 6. 葡萄牙塔霍河口莫伊塔-蒙蒂茹湾蒙蒂茹水道南岸潮滩变化速率数据集（1995—2018年）：rates_tf_sb_moitamontijobay_1995_2018.shp 本数据集的正式引用格式为： Martins, D., Alves da Silva, A., Duarte, J., Canário, J., & Vieira, G. (2023). 船舶交通变化干扰葡萄牙塔霍河口潮滩与盐沼. 《Estuaries and Coasts》. DOI: https://doi.org/10.1007/s12237-023-01198-7 *项目说明：Planta II项目编号为PTDC/CTA-GQU/31208/2017，由欧洲区域发展基金（ERDF）通过里斯本区域运营计划提供资助，并由葡萄牙科学技术基金会（FCT）通过国家资金（PIDDAC）联合资助。