Description:
This study examines the vulnerability of the Columbia Wetlands to climate change based on their location using a combination of field investigation and hydrological modelling, with special attention paid to select wetlands that have either experienced or have planned restoration efforts to improve water retention. We found there is regional variation in wetland vulnerability, where the northern portion of the study is likely to be less affected by shifts in climate due to an increase in water supply and less atmospheric sensitivity. The southern portion of the study area is highly vulnerable, with an earlier onset of spring freshet accompanied by an insignificant increase in peak streamflow and substantial water loss under a warmer climate. All wetland groups are likely to be equally vulnerable; however, water retention will be critical to maintain wetland diversity. The Beaver Dam Analogues are an important adaptation measure, particularly in the southern portion of the study area. Without these structures, it is likely that water levels would continue to follow the patterns of the Columbia River. A longer streamflow recession period with hotter and drier summer conditions could lead to a substantial reduction in open water area, already being observed in other studies.

Keywords: wetlands; riparian; hydrology; climate change; assessment

Authors:

Organization: Columbia Wetlands Stewardship Partners

Category: Hydrologically Vulnerable Wetlands

Focal Area: Columbia Wetlands

Resource Type: Report

Year: 2025