Surface-Groundwater interactions on the Eastern Snake River, ID - PowerPoint PPT Presentation

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Surface-Groundwater interactions on the Eastern Snake River, ID

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Unsteady flow simulation(10 non-raining days) Compare the outflow hydrograph with the actual hydrograph ... 2D plan view (DOP) Calculate location of the thalweg ... – PowerPoint PPT presentation

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Title: Surface-Groundwater interactions on the Eastern Snake River, ID


1
Surface-Groundwater interactions on the Eastern
Snake River, ID
2
Outline
  • Objective Estimate of seepage loss along a
    segment of the Eastern Snake river
  • River Channel Generation (RCMM)
  • Unsteady flow simulation(10 non-raining days)
  • Compare the outflow hydrograph with the actual
    hydrograph
  • Calculate volume of water lost to the aquifer

3
Misc. Facts about Idaho
  • 3,100 miles of river, more than any other state
  • 85 of all commercial trouts
  • Number one producer of potatoes
  • Paris and Montpellier 30 miles apart

4
Study area
Unconfined aquifer Highly fractured basalt Water
Supply from snowmelt Precipitation 8 in/yr
5
Human impact on the Eastern Snake system
(source IDWR)
Less surface water irrigation More efficient
irrigation Increased pumping
6
Water Budget
7
Increased stress on the aquifer
(source IDWR)
8
Eastern Snake aquifer Model
9
Eastern Snake aquifer
10
River Channel generation
11
3D Representation of river reaches
  • Bathymetric data
  • (Expensive, unavailable)
  • 2D 3D representation
  • 2D plan view (DOP)
  • Calculate location of the thalweg
  • Approximate cross-sections with analytical
    functions

12
2D representation of the river segment
  • Calculate Depth/Width for a 2 yr flow
  • Offset the NHD flow line by W/2 to obtain the
    channel boundary

Depth
Width
2D Plan view
13
River Channel generation (RCMM)
  • REQUIRES 2D representation of the river segment
  • GENERATES 3D representation
  • Thalweg Calculates the radius of curvature
  • Locates the thalweg using the
    radius of curvature/thalweg
  • relationship
  • Cross-sections Analytical (Beta functions) from
    the thalweg location

14
Generated cross-sections
15
Exporting river channel into HEC-RAS
16
Unsteady simulation
  • 10 day simulation
  • Upstream boundary condition USGS flow hydrograph
    (_at_Minidoka)
  • Downstream boundary condition stage hydrograph
    (_at_Kimberley)
  • Compare the calculated/observed
  • hydrograph

17
Acknowledgments
  • Dr Merwade (CRWR)
  • Allan Willie (Hydrologist, IDWR)

18
  • Any questions?
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