A water quality loading model for tillamook bay
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A Water Quality Loading Model for Tillamook Bay. Patrice A. Melancon Thanks to: Dr. David Maidment Dr. Michael Barrett Dr. Francisco Olivera Dr. Maidment’s Research Group. Outline . Introduction Problem and Objective Why use GIS? Developing the Model Using the Model

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A water quality loading model for tillamook bay

A Water Quality Loading Model for Tillamook Bay

Patrice A. Melancon

Thanks to:

Dr. David Maidment

Dr. Michael Barrett

Dr. Francisco Olivera

Dr. Maidment’s Research Group


Outline
Outline

  • Introduction

  • Problem and Objective

  • Why use GIS?

  • Developing the Model

  • Using the Model

  • Conclusions and Future Work


Introduction
Introduction

  • National Estuary Program

  • Tillamook Bay


Problem and objective
Problem and Objective

  • My work is focusing on two issues:

    • High Coliform loads

    • High Sediment loads

  • Developing a model that can serve as a Management Tool


Problem history
Problem History

  • Coliform contamination:

    • Animals confined in winter; manure storage

    • Liquid and solid manure applied as fertilizer

    • Cow access to streams

  • Sediment contamination:

    • Largely linked to logging practices

    • Roads linked to frequent landslides


Why use gis
Why Use GIS?

  • Basic precept of Water Quality Modeling

    • Load = Flow x Concentration

  • Spatial Variability

  • ArcView’s Hydrology Function

  • Grids and Coverages


Gis grid representation
GIS Grid Representation

  • Surface divided into equal-sized cells

  • Each cell has a value

  • Value represents only one specific characteristic

Bay Depth Below MSL


Gis coverage representation
GIS Coverage Representation

  • Surface represented as polygons, lines, or points

  • Each record contains information on multiple characteristics


Developing the model
Developing the Model

  • ArcView Hydrology Functions

Flow Direction

Flow Accumulation

DEM

Accumulation in Streams


Hydrology model
Hydrology Model

Runoff

+

Baseflow

Streamflow =

Baseflow,B

B

Precip

Flow

Runoff,R

R

Precip



Hydrology model1
Hydrology Model

RO

P

Runoff Grid

BF

Precip Grid

P

Baseflow Grid


Event mean concentrations
Event Mean Concentrations

Runoff Concentrations

0

11- 19

21 - 24

31 - 33

41 - 43

51 - 54

61 - 63

71 - 75


Pollutant loadings
Pollutant Loadings

  • EMC grid x Flow grid = Load grid

  • Flow accumulations of flow and load grids

  • Predicted pollutant concentrations =

Accumulated Load

Accumulated Flow


Using the model
Using the Model

  • Incorporate Effects of BMPs

    • Current focus is on CAFOs

    • 3 BMPs to model

  • Representing spatial distribution

    • Farm location vs land affected

    • Use spatial average

  • Analysis by subwatershed or land use


Model analysis
Model Analysis

  • Clip out subwatershed of interest

  • Export data to analyze BMP effects or contribution

Trask River Land Use

Trask River Coliform Runoff Load


Conclusions
Conclusions

  • Can build effective management tool

  • Effects of BMPs and relative contributions can be examined


Future work
Future Work

  • More work on sediment

  • Incorporate BMP effects

  • Model calibration


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