forest hydrology n.
Skip this Video
Download Presentation
Forest Hydrology

Loading in 2 Seconds...

play fullscreen
1 / 9

Forest Hydrology - PowerPoint PPT Presentation

  • Uploaded on

Forest Hydrology. Issue: Interaction of forests, fish, and climate One of the dominant pathways by which land cover change affects freshwater fish habitat is via sediment loading associated with forest disturbance

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about 'Forest Hydrology' - lise

Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
forest hydrology
Forest Hydrology

Issue: Interaction of forests, fish, and climate

  • One of the dominant pathways by which land cover change affects freshwater fish habitat is via sediment loading associated with forest disturbance
  • Vegetation management, forest fires, and forest roads affect both the amount of sediment available for transport and the amount of surface water available to transport it.
  • The interaction of climate with these processes has not previously been explored but is likely to have implications for integrated management and conservation efforts, especially recovery of PNW salmon (for which expenditures in the region are several hundred $million annually).
  • An enhanced ability to project the likely effects of climatic change, fire, and vegetation management on sediment transport would improve our understanding of forest-aquatic interactions and the scientific basis for forest management.
research questions
Research questions
  • What are the relative contributions of sediment generation from landslides, road and road cut erosion, and surface erosion over the general landscape, and how do these relative contributions vary over the climate regimes represented by forested areas of the PNW?
  • How do the amounts and proportions of sediment generated from the above sources compare to sediment generated by extreme storms, droughts, and fire regimes, and to sedimentation amounts under forest different management scenarios?
  • How will sediment generation from PNW watersheds respond to the interaction of land cover change with climatic variability and change at decadal to century time scales?
  • Modify existing Distributed Hydrology-Soil-Vegetation Model (DHSVM) to include the capability to represent sediment generation by slope failures, and hillslope and road erosion, as well as sediment routing through channel systems (partially completed, see Doten et al, 2004, in review, WRR)
  • For both “generic” watersheds and specific demonstration applications, conduct evaluations of impacts of alternative forest policy and management scenarios with respect to harvest, thinning, prescribed burning, and road construction or obliteration, and evaluate (via “shuffled deck” experiments), climate risk (and effects of changing climate) associated with these scenarios.
distributed hydrology soil vegetation model dhsvm
Distributed hydrology-soil-vegetation model (DHSVM)
  • Physically based hydrologic model that represents the effects of
    • Topography
    • Soil
    • Vegetation
  • Solves the energy and water balance at each grid cell at each timestep
erosion and sediment transport module



Erosion and Sediment Transport Module


Soil Moisture Content


Channel Flow




Leaf Drip

Infiltration and Saturation Excess Runoff







failure prediction
Failure Prediction
  • Mass wasting algorithm performed at a finer resolution
  • TOPMODEL topographic wetness index used to redistribute soil saturation (Beven and Kirkby, 1979; Burton and Bathurst, 1998)
  • Run for critical times
overroad flow routing
Overroad Flow Routing
  • Routing takes into account crown


road crown

road- side ditch


  • Sediment becomes available for transport by:
    • three mechanisms (hillslopes)
    • two mechanisms (roads)



leaf drip


shearing by overland flow

Mechanisms of Soil Particle Detachment

sediment routing
Sediment Routing


  • If a pixel contains a channel (including road-side ditches), all sediment enters the channel.

Road surface sediment:

  • Routed according to the crown type.
  • Added to the road-sideditch is routed through the network to a culvert.
  • Delivery from culvert to stream based on proximity and particle size:

Hillslope Sediment Routing