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USING GIS TO MAP COASTAL WATER QUALITY AT IMPERIAL BEACH

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USING GIS TO MAP COASTAL WATER QUALITY AT IMPERIAL BEACH Andrew Judd GIS in Water Resources University of Texas TIJUANA, MEXICO Important part of Mexico s growing ... – PowerPoint PPT presentation

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Title: USING GIS TO MAP COASTAL WATER QUALITY AT IMPERIAL BEACH


1
USING GIS TO MAP COASTAL WATER QUALITY AT
IMPERIAL BEACH
  • Andrew Judd
  • GIS in Water Resources
  • University of Texas

2
TIJUANA, MEXICO
  • Important part of Mexicos growing economy
  • Growth has not come without a price
  • Infrastructure not kept pace with industrial
    development and population growth
  • Overtaxed sewer systems spill into Tijuanas
    waterways
  • Most of which ultimately drains to the Tijuana
    River

3
IMPERIAL BEACH, CALIFORNIA
  • Coastal community south of San Diego
  • Located at estuary of Tijuana River
  • Continual coastal water quality issues from
    untreated wastewater flow in Tijuana River
  • Contaminated water dispersed along the coastline
    through ocean currents

California
Pacific Ocean
Imperial Beach
4
GIS PROJECT
  • Create GIS format for assessment of Imperial
    Beach water quality as it relates to Tijuana
    River Flow
  • Several water quality testing stations on
    Imperial Beach coastline
  • River flow gage at the South Bay International
    Wastewater Treatment Plant
  • Use data to create temporal map of water quality
    and river flow

5
DEFINITIONS
  • In general, level of water quality dependant on
    what is in the water and what the water is used
    for
  • With untreated wastewater issues, coliform
    bacteria used to test for contamination
  • Bacteria generally not harmful, but indicate
    presence of disease-causing pathogens
  • This project using enterococci bacteria subgroup
    for water quality data
  • Enterococci recommended by EPA for ocean water
    because the bacteria most closely mimic
    pathogens salt water life cycle

6
PROJECT DATA
  • Water quality testing data from SDCOOS website
    (MPN/100mL)
  • Testing at Imperial Beach stations somewhat
    sporadic (daily to weekly)
  • Flow data for Tijuana River from IBWC website
    (MGD)
  • Flow gage at upstream end of river estuary, used
    as general indicator of flow level
  • Averaged river flow and water quality data over
    weekly basis to allow for comparison

7
MAP CREATION
  • Testing station locations (latitude, longitude)
    from SDCOOS website
  • Tijuana River reach from NHD website
  • Weekly averaged bacteria and flow data converted
    to dbf format
  • Linked data to stations using tracking analyst
    tools
  • Using playback manager, can view time series of
    bacteria and flow data

Map of Imperial Beach Water Quality Testing
Stations created with ArcGIS
8
ANIMATION OF TIME SERIES DATA
  • For February to May 2000
  • Displays weekly averaged Imperial Beach bacteria
    levels and Tijuana River flow
  • Levels of bacteria and flow symbolized according
    to magnitude
  • SHOW MOVIE

9
ANALYSIS OF TIME SERIES DATA
  • Week of 2/14/2000, Tijuana River flow and
    bacteria at low levels
  • During following two weeks, river flow above 100
    MGD
  • Bacteria testing at high levels throughout 3.5
    miles of coastline
  • Beaches are closed when enterococci levels exceed
    104/100mL
  • During week of 2/28/2000 bacteria levels exceed
    1000/100mL

10
ANALYSIS OF TIME SERIES DATA (cont.)
  • Although flow levels decrease, bacteria levels
    remain high at all IB Stations until week of
    3/27/2000
  • Flow and bacteria levels fluctuate until May of
    2000
  • Flow levels begin to decrease and during week of
    5/1/2000 high bacteria localized to estuary
  • By 5/8/2000, sustained low flow and bacteria
    levels

11
CONCLUSIONS
  • Strong relationship between Tijuana River flow
    and Imperial Beach bacteria levels
  • Contaminated flow in Tijuana River carries
    effects throughout Imperial Beach coastline
  • ArcGIS is an effective tool for displaying groups
    of time series data

12
ADDITIONAL INFORMATION
  • San Diego Coastal Ocean Observing System (SDCOOS)
    through University of California San Diego
  • Has water quality data as well as ocean current,
    water temperature, weather data and more

Bacteria Levels on 11/29/04 from SDCOOS website
(www.sdcoos.ucsd.edu)
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