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Watershed Modeling Approaches

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Watershed Modeling Approaches Distributed: CASC-2D (CSU, U Conn, WMS) overland flow: 2-D diffusion wave with explicit FD channel flow: 1-D diffusion wave with ... – PowerPoint PPT presentation

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Title: Watershed Modeling Approaches


1
Watershed Modeling Approaches
Distributed CASC-2D (CSU, U Conn, WMS)
  • overland flow 2-D diffusion wave with explicit
    FD
  • channel flow 1-D diffusion wave with explicit
    FD, or 1-D dynamic wave with implicit Preissmann
    scheme
  • infiltration Green-Ampt equation with
    redistribution
  • evapotranspiration, interception, erosion
    (overland and channel)

2
Watershed Modeling Approaches CASC-2D
3
Watershed Modeling Approaches CASC-2D
4
Watershed Modeling Approaches
Soil Moisture Routing Model (Cornell)
  • subsurface 2-D Darcys Law / water balance,
    topography driven
  • evapotranspiration
  • deep percolation

5
Watershed Modeling Approaches
DHSVM
  • Grid-based subsurface routing, hydraulic
    gradient ground slope
  • Power law subsurface hydraulic conductivity
    (transmissivity) function
  • Unit hydrograph distribution of excess runoff
    (travel time for each pixel)
  • Muskingum-Cunge network/channel routing

6
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7
Watershed Modeling Approaches
KINEROS2 (USDA-ARS)
  • overland flow 1-D kinematic wave, 4-pt
    implicit FD wetted area factor in recession
  • channel flow 1-D kinematic wave, 4-pt
    implicit FD
  • infiltration Smith-Parlange, layered soils,
    redistribution, interactive (plane to plane),
    sub-grid effective parameters
  • erosion and sedimentation 4-pt implicit FD
  • interception

8
Watershed Modeling Approaches KINEROS2
9
Watershed Modeling Approaches KINEROS2
10
Watershed Modeling Approaches KINEROS2
11
Watershed Modeling Approaches
TOPMODEL
  • Topographically Driven slope, contributing
    area, convergence
  • Saturated zone hydraulic gradient assumed to be
    equal to slope
  • Exponential decrease of hydraulic conductivity
    with depth
  • Watershed outflow related to mean depth to
    water table
  • Saturation and infiltration excess runoff
    generation
  • Evapotranspiration
  • Channel routing kinematic wave

K0 surface conductivity, f decay coef., b
ground slope
12
Watershed Modeling Approaches Topmodel
13
Watershed Modeling Approaches
SAC-SMA (part of NWSRFS)
  • Physically-based conceptual model
  • based on physical concepts that describe water
    movement trough a watershed
  • Lumped
  • Continuous
  • Two-layer soil model (upper and lower zones)

14
Watershed Modeling Approaches SAC-SMA
Components
  • Tension water (unsaturated)
  • Free water (saturated)
  • Surface flow
  • Lateral drainage
  • Evapotranspiration
  • Vertical drainage (percolation)

15
Watershed Modeling Approaches SAC-SMA
16
Watershed Modeling Approaches SAC-SMA
17
Watershed Modeling Approaches
  • SAC-SMA is a component of NWSRFS
  • Snow models available
  • Runoff over a time step distributed to
    watershed outlet using UH
  • Channel routing lumped methods, distributed
    methods
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