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February 17, 2002 R. Ed Beighley Marine Science Institute University of California, Santa Barbara

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Hydrologic Modeling for the Santa Barbara Channel – Long Term Ecological Research Project. February 17, 2002 R. Ed Beighley Marine Science Institute University of California, Santa Barbara. http://sbc.lternet.edu/. SBC-LTER Objective….

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slide1

Hydrologic Modeling for the Santa Barbara Channel – Long Term Ecological Research Project

February 17, 2002

R. Ed Beighley

Marine Science Institute

University of California, Santa Barbara

http://sbc.lternet.edu/

slide2

SBC-LTER Objective…

  • The primary research objective of the SBC LTER is to investigate the relative importance of land vs. ocean processes in structuring giant kelp forest ecosystems for different conditions of land use and climate.
slide3

Gaviota

Arroyo Hondo

Arroyo Burro

Mission

Refugio

El Capitan

Santa Monica

Franklin

Carpinteria

Rincon

SBC – LTER Study Region...

Santa Barbara Channel

slide4

Hydrologic Modeling…

  • Compile/Develop Spatial Data
    • Topography (DEM)
    • Drainage Network (Stream and Drains)
    • Land Use (Digital Images and Parcels)
    • Soils (SSURGO)
  • Estimate Rainfall Coverages
    • Rain Gauge Network
    • Orographic Enhancement
  • Setup HEC-HMS Model
    • Sub-divide watersheds
    • Determine spatially averaged parameters
slide5

Spatial Data...

Mission Creek Watershed at Montecito St.

SBC-LTER ID: MC00

slide6

Spatial Data...

Santa Barbara City

Parcel Boundaries and Zoning Information

Low Density Residential

“IMPERVIOUS AREA”

Medium Density Residential

slide7

Gaviota

Arroyo Hondo

Arroyo Burro

Mission

Refugio

El Capitan

Santa Monica

Franklin

Carpinteria

Rincon

SBC – LTER Rain Gauge Network...

slide8

Gauge EL

1000 m

Gauge EL 30 m

Orographic Enhancement…

Water Year 2001

slide9

Orographic Enhancement…

  • Precipitation distributed to each pixel, Pi, by:

where a, b and c are storm specific regression coefficients; Ei and Ai are elevation and aspect, respectively; ei is the regression residual at gauge k; wi is the inverse-distance-squared weight for gauge k; and m is the number of gauges used in the weighting procedure (Taschner et al, 2001).

slide10

Hydrologic Model…

  • HEC-HMS Model
    • Spatially averaged parameters
    • Event based
  • Surface Response
    • Impervious surfaces
    • Infiltration excess
  • Subsurface Response
    • Rapid shallow soil flow (interflow)
    • Slower groundwater discharge (baseflow)
  • Flow Routing
    • Overland
    • Channel
slide11

HEC-HMS Model...

Junctions:

Flow Connections

  • Sub-Basin Properties:
    • Drainage Area
    • Flow Length
    • Roughness
    • Slope
  • Channel Properties:
    • Cross-Sect. Shape
    • Length
    • Roughness
    • Slope

SBC-LTER Sample Site, MC00, Mission Cr. @ Montecito St.

Outlet

HEC-HMS Model Schematic

slide12

Surface Response…

  • Impervious Surfaces
    • All rainfall runoffs off
  • Infiltration Excess
    • No runoff until initial losses satisfied:
      • Interception, ground cover, etc.
      • Initial soil moisture deficit (ex., 30%)
      • Maximum soil storage (ex., 35 cm)
    • When above satisfied, runoff occurs when:
      • rainfall rate > infiltration rate
slide13

Subsurface Response…

  • Exponential recession model
    • where Qt is the recession flow starting at time T; QT is the threshold flow; k is an exponential decay constant
    • QT is a flow specified as a ratio-to-peak surface flow (ex., 20%)
    • Rate of recession, k, changes depending upon subsurface source: interflow or deep groundwater
slide14

Subsurface Response…

Threshold Flow, QT

slide15

Flow Routing…

  • Kinematic-Wave Model
    • Overland and channel flow
    • Based on momentum and continuity
    • Assumptions:
      • 1-dimensional flow
      • No acceleration effects
      • No backwater effects
      • Overland plane is a shallow wide rectangular channel
      •  and m are functions of channel geometry, slope and roughness
slide16

HEC-HMS Model Results...

Mission Creek at Mission St. USGS Gauge No. 11119745

March 4-7, 2001

HEC-HMS Simulation

USGS Gauge Data

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