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Sustainability 2017, 9(11), 1919;

Remote Sensing for Wetland Mapping and Historical Change Detection at the Nisqually River Delta

U.S. Geological Survey, Western Geographic Science Center, 345 Middlefield Rd, Menlo Park, CA 94025, USA
U.S. Geological Survey, Western Ecological Research Center, 505 Azuar Drive, Vallejo, CA 94592, USA
Nisqually Indian Tribe, 4820 She-Nah-Num Dr SE, Olympia, WA 98513, USA
Author to whom correspondence should be addressed.
Received: 3 August 2017 / Revised: 11 October 2017 / Accepted: 18 October 2017 / Published: 26 October 2017
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Coastal wetlands are important ecosystems for carbon storage and coastal resilience to climate change and sea-level rise. As such, changes in wetland habitat types can also impact ecosystem functions. Our goal was to quantify historical vegetation change within the Nisqually River watershed relevant to carbon storage, wildlife habitat, and wetland sustainability, and identify watershed-scale anthropogenic and hydrodynamic drivers of these changes. To achieve this, we produced time-series classifications of habitat, photosynthetic pathway functional types and species in the Nisqually River Delta for the years 1957, 1980, and 2015. Using an object-oriented approach, we performed a hierarchical classification on historical and current imagery to identify change within the watershed and wetland ecosystems. We found a 188.4 ha (79%) increase in emergent marsh wetland within the Nisqually River Delta between 1957 and 2015 as a result of restoration efforts that occurred in several phases through 2009. Despite these wetland gains, a total of 83.1 ha (35%) of marsh was lost between 1957 and 2015, particularly in areas near the Nisqually River mouth due to erosion and shifting river channels, resulting in a net wetland gain of 105.4 ha (44%). We found the trajectory of wetland recovery coincided with previous studies, demonstrating the role of remote sensing for historical wetland change detection as well as future coastal wetland monitoring. View Full-Text
Keywords: coastal wetlands; wetland mapping and monitoring; remote sensing coastal wetlands; wetland mapping and monitoring; remote sensing

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Ballanti, L.; Byrd, K.B.; Woo, I.; Ellings, C. Remote Sensing for Wetland Mapping and Historical Change Detection at the Nisqually River Delta. Sustainability 2017, 9, 1919.

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