Landslides and Debris Flows
Landslides and Debris Flows
Often related to our geomorphology and sediment studies, we assess how sediment delivered to streams by landslides and debris flows can cause exacerbate downstream flood hazards. And usually in partnership with USGS landslide and debris flow specialists from other Centers, we assess landslide and debris flow hazards downstream from volcanos, in intensively burned mountainous areas, and in urban areas along the steep bluffs abutting Puget Sound and many lowland river valleys.
Filter Total Items: 6
Hoh geomorphology
The Issue: Glaciers in the Hoh River watershed are expected to largely disappear by 2050, while flooding is expected to become more intense. Understanding if or how this will impact sediment transport and channel change in the watershed is relevant for salmon habitat, restoration efforts, and flood hazard management. However, there is relatively little information about historical channel...
Post-wildfire sedimentation and release of metals to Conconully Reservoir, Washington
Wildfires can negatively impact reservoirs and water supply. In 2021, a wildfire in Okanagan County, Washington, engulfed a large area around Conconully Reservoir. USGS scientists are assessing sediment and water quality in the reservoir and surrounding streams.
SR 530 Slide
In the immediate aftermath of the SR530 Landslide, the USGS supported first responders and decision-makers as a key member of the collaborative effort to monitor the stability of the landslide deposit and the associated impoundment of the North Fork Stillaguamish River during rescue operations. With the initial disaster response now over, longer-term questions have arisen regarding the stability...
Pasco Groundwater Storage
The Issue: Since 1952 water diverted from the Columbia River has been used to irrigate parts of the Pasco basin in eastern Washington. As a result of the surface-water irrigation, groundwater levels generally have risen in the area. The increases in groundwater fluxes and groundwater in storage have created a need to better understand the flow system before and after the start of irrigation to...
Nooksack River Ground-Water Bacteria
The lower Nooksack River Basin is located in Whatcom County, in the northwestern part of Washington. Within areas of the basin, the ground-water aquifer is shallow. Knowledge of how the surface water and the aquifer interact, and how this interaction affects the transport of bacteria and nitrates from agricultural fields to the ground-water system, is important to residents of the basin. This is...
Puget Hazards
Nationally, the USGS monitors and assesses geologic and hydrologic natural hazards. In the Puget Sound Basin, common hazards that also can cause damage include earthquakes and floods. Other hazards in the region that cause less damage or happen less frequently include landslides, debris flows, tsunamis, and volcanic eruptions. Although much is known about these natural hazards, mitigation and...