Comparison of regression relations of bankfull discharge and channel geometry for the glaciated and nonglaciated settings of Pennsylvania and southern New York

Clune, John W.; Chaplin, Jeffrey J.; White, Kirk E.

doi:10.3133/sir20185066

Cited by 2 publications

(3 citation statements)

References 14 publications

(24 reference statements)

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“…Peak flows with 100-yr return period are used as the inflow boundary condition. Channel bathymetry is estimated using regional, hydraulic-geometry scaling relationships from previous studies (Cinotto 2003;Chaplin 2005;Clune et al 2018;Roland and Hoffman 2011). We use a constant Manning's roughness value of 0.045 for both the channel and floodplain.…”

Section: E Flood Inundation Mappingmentioning

confidence: 99%

Regional Flood Risk Projections under Climate Change

Sharma

Gomez

Keller

et al. 2021

Journal of Hydrometeorology

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Flood-related risks to people and property are expected to increase in the future due to environmental and demographic changes. It is important to quantify and effectively communicate flood hazards and exposure to inform the design and implementation of flood risk management strategies. Here we develop an integrated modeling framework to assess projected changes in regional riverine flood inundation risks. The framework samples climate model outputs to force a hydrologic model and generate streamflow projections. Together with a statistical and hydraulic model, we use the projected streamflow to map the uncertainty of flood inundation projections for extreme flood events. We implement the framework for rivers across the state of Pennsylvania, United States. Our projections suggest that flood hazards and exposure across Pennsylvania are overall increasing with future climate change. Specific regions, including the main stem Susquehanna River, lower portion of the Allegheny basin and central portion of Delaware River basin, demonstrate higher flood inundation risks. In our analysis, the climate uncertainty dominates the overall uncertainty surrounding the flood inundation projection chain. The combined hydrologic and hydraulic uncertainties can account for as much as 37% of the total uncertainty. We discuss how this framework can provide regional and dynamic flood-risk assessments and help to inform the design of risk-management strategies.

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Section: E Flood Inundation Mappingmentioning

confidence: 99%

Regional Flood Risk Projections under Climate Change

Sharma

Gomez

Keller

et al. 2021

Journal of Hydrometeorology

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“…We ran the model using different DEM resolutions (3, 10, and 30 m), with a sub-grid-scale representation of stream channels 65 at the HUC-12 catchment level. To estimate the channel geometry, we used bankfull channel dimensions from regional hydraulic-geometry scaling relationships 66 . This approach is reasonable when channel bathymetry data are not available 67,68 .…”

Section: Configuration Of the Hydrodynamic Flood Inundation Modelmentioning

confidence: 99%

“…This approach is reasonable when channel bathymetry data are not available 67,68 . The hydraulic-geometry relationships accounted for the difference in channel dimensions between streams underlain by carbonate and noncarbonate rocks 66 . Using the DEM "burning" approach as well as data (crest level and geometric attributes) from the NLD 30 , levees were incorporated into the hydrodynamic model 29,69 .…”

Section: Configuration Of the Hydrodynamic Flood Inundation Modelmentioning

confidence: 99%

Flood teleconnections from levees undermine disaster resilience

Ansari,

Mejia,

Cibin

2024

npj Nat. Hazards

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Inland levees can amplify flood risk in unprotected communities by altering floodwater levels away from their location. While these nonlocal effects of levees, which we term flood teleconnections, have been studied for specific river segments, their impact on flood risks along a river network remains underexplored. By combining data-driven, hydrodynamic, and economic models, we quantify the magnitude, spatial distribution, and economic damages associated with flood teleconnections for a large river network system with extensive levees. We find that due to levees, the 100-year flood inundation extent grows by 25% of the total levee-protected area regionally, and the flood inundation depth increases by up to 2 m at specific locations. Levees also increase the vulnerability of unprotected, marginalized communities to flooding. Our results demonstrate that flood teleconnections are spatially widespread, involve unaccounted costs, and can lead to flood inequities. These findings will be critical to climate adaptation efforts in flood-prone regions.

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Comparison of regression relations of bankfull discharge and channel geometry for the glaciated and nonglaciated settings of Pennsylvania and southern New York

Cited by 2 publications

References 14 publications

Regional Flood Risk Projections under Climate Change

Regional Flood Risk Projections under Climate Change

Flood teleconnections from levees undermine disaster resilience

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