Salt marshes are at risk globally if they cannot keep pace with sea level rise. Along the United States Mid-Atlantic coast, high marsh has already declined, and is particularly vulnerable to future loss due to greater regional rates of relative sea level rise and limited capacity for both vertical accretion and landward migration. To support climate adaptation efforts in the region, we conducted a spatial overlay analysis to (1) assess interior ponding in the high tidal marsh zone caused by waterlogging, and (2) identify restoration opportunities where poor drainage is limiting natural recovery. Surface inundation has increased across over 14,000 ha of high marsh in the region, mostly along the eastern Chesapeake Bay and New Jersey coast. Within this waterlogged area, we identified 239 potential restoration sites (275 ha). Validation data indicate our analysis had relatively high accuracy in identifying potential restoration sites, with a true positive rate of 76% and a true negative rate of 96%. Widespread waterlogging emphasizes the need for climate adaptation efforts to restore and protect high marsh in the face of future change. Our recommended restoration strategy of connecting waterlogged sites to tidal creeks aligns with best practices by enabling drainage of high marsh to halt or even reverse ponding, improve recovery from future flooding events, and ultimately facilitate marsh migration with sea level rise.

中文翻译：

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绘制海平面上升影响图，以确定美国切萨皮克和特拉华湾的气候变化适应机会

如果盐沼无法跟上海平面上升的步伐，那么它们将在全球范围内处于危险之中。在美国中大西洋沿岸，高沼泽地已经下降，并且由于地区相对海平面上升率增加以及垂直增生和陆运能力有限，特别容易遭受未来的损失。为了支持该地区的气候适应工作，我们进行了空间覆盖分析，以（1）评估因涝灾造成的高潮沼泽地带的内部积水，以及（2）确定排水不畅限制自然恢复的恢复机会。在该地区超过14,000公顷的高沼泽地带，大多数沿切萨皮克湾东部和新泽西州海岸，地表洪水泛滥。在这个水灾地区，我们确定了239个潜在的恢复地点（275公顷）。验证数据表明，我们的分析在识别潜在修复位点方面具有相对较高的准确性，真实阳性率为76％，真实阴性率为96％。广泛的洪涝灾害强调了应对未来变化而应对气候变化的努力，以恢复和保护高沼地。我们建议的将淹水地点连接到潮汐小溪的恢复策略与最佳实践相吻合，可以使高沼泽地的排水系统停止甚至颠覆池塘，提高未来洪水事件的恢复能力，并最终促进沼泽随海平面上升而迁移。广泛的洪涝灾害强调了应对未来变化而应对气候变化的努力，以恢复和保护高沼地。我们建议的将淹水地点连接到潮汐小溪的恢复策略与最佳实践相吻合，可以使高沼泽地的排水系统停止甚至颠覆池塘，提高未来洪水事件的恢复能力，并最终促进沼泽随海平面上升而迁移。广泛的洪涝灾害强调了应对未来变化而应对气候变化的努力，以恢复和保护高沼地。我们建议的将淹水地点连接到潮汐小溪的恢复策略与最佳实践相吻合，可以使高沼泽地的排水系统停止甚至颠覆池塘，提高未来洪水事件的恢复能力，并最终促进沼泽随海平面上升而迁移。