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


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SBC-LTER Objective… Term Ecological Research Project

  • 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.


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Gaviota Term Ecological Research Project

Arroyo Hondo

Arroyo Burro

Mission

Refugio

El Capitan

Santa Monica

Franklin

Carpinteria

Rincon

SBC – LTER Study Region...

Santa Barbara Channel


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Hydrologic Modeling… Term Ecological Research Project

  • 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


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Spatial Data... Term Ecological Research Project

Mission Creek Watershed at Montecito St.

SBC-LTER ID: MC00


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Spatial Data... Term Ecological Research Project

Santa Barbara City

Parcel Boundaries and Zoning Information

Low Density Residential

“IMPERVIOUS AREA”

Medium Density Residential


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Gaviota Term Ecological Research Project

Arroyo Hondo

Arroyo Burro

Mission

Refugio

El Capitan

Santa Monica

Franklin

Carpinteria

Rincon

SBC – LTER Rain Gauge Network...


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Gauge EL Term Ecological Research Project

1000 m

Gauge EL 30 m

Orographic Enhancement…

Water Year 2001


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Orographic Enhancement… Term Ecological Research Project

  • 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).


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Hydrologic Model… Term Ecological Research Project

  • 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


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HEC-HMS Model... Term Ecological Research Project

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


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Surface Response… Term Ecological Research Project

  • 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


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Subsurface Response… Term Ecological Research Project

  • 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


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Subsurface Response… Term Ecological Research Project

Threshold Flow, QT


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Flow Routing… Term Ecological Research Project

  • 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


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HEC-HMS Model Results... Term Ecological Research Project

Mission Creek at Mission St. USGS Gauge No. 11119745

March 4-7, 2001

HEC-HMS Simulation

USGS Gauge Data


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