Modified SWAT Model for Modified SWAT Model for Cold Climate of CanadaCold Climate of Canada

Application: Rouge RiverRouge River Watershed

Masoud AsadzadehMasoud AsadzadehWanhong Yang & Yongbo LiuLuis Leon & William BootyRam Yerubandi , Craig McCrimmon, Issac Wong, and Phil Fong

Simulate the Current State of the Rouge River Watershed (Base Case)

• Soil Type

• Land-Use

• Management Operations

• Observed Climate Data

• Observed Flow and Water Quality Data

Estimate the Impact of Increasing the Forest Land-Use (Reforestation)

Increase the Forest Land-Use

Compare Base Case and Reforestation Scenarios: Simulated Flow, Water Quality

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Rouge River WatershedRouge River Watershed

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TRCA watershed maps: http://trca.on.ca/the-living-city/watersheds/ Scholars GeoPortal website: http://geo2.scholarsportal.info/

Little Rouge at Reesor Road

Main Rouge near 14th Avenue

Main Rouge at Twyn Rivers Drive

Rouge River WatershedRouge River Watershed

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Data from Canadian Soil Information Service (CanSIS) Version 3

Rouge River WatershedRouge River Watershed

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Data and map is provided by TRCA and represents 2005 conditions

Hay 38

Corn 30

Soybean 22

Winter Wheat 10

CanSWATCanSWATSnow Redistribution:Snow Redistribution:Snow can redistribute between land-use classes based on:

•Wind direction

•Slope and curvature along the wind direction

•Elevation

Snowmelt under Frozen Soil Condition:Snowmelt under Frozen Soil Condition:•Modified CNfrz based on SW of each layer of the soil

•Added soil erodibility factor for snowmelt events

•Added user defined nutrient enrichment ratios, nitrate percolation coefficient, and P soil partitioning coefficient for snowmelt events.

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Calibration ObjectivesCalibration Objectives

Sum of Absolute ErrorSum of Absolute Error

Percent Bias in Percent Bias in HighHigh Flow Flow

Percent Bias in Percent Bias in LowLow Flow Flow

Percent Bias in Percent Bias in Mid-RangeMid-Range Flow Flow

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PA-DDSPA-DDS

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Perturb current ND solution

Update ND solutions

Continue?STOP

New solution is ND?

Pick the New solution

Pick a ND solution

Initialize starting solutions

YYNN

Create ND-solution set

YYNN

Base CaseBase Case

Water Balance Components Annual Average

Estimated by Water Balance Studies in the Past

CanSWAT

Precipitation (mm) 840 - 870 837

Snowfall (mm) 126 - 130 102

Evapotranspiration (mm) 520 - 540 477

Runoff (mm) 320 - 330 351

Surface Flow (mm) 189 - 196 209

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ReforestationReforestation

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ReforestationReforestation

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ReforestationReforestation

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ReforestationReforestation

Rouge River Watershed Outlet

Base Case Reforestation % differenceTSS (mg/l) 218 185 15.1↓↓TP (mg/l) 0.287 0.280 2.5 ↓↓TN (mg/l) 1.267 1.223 3.5 ↓↓High Flow (cms) 38.5 35.4 8.0 ↓↓Low Flow (cms) 1.00 1.01 1.0 ↑↑

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Rouge River watershed is modelled with detailed information about the soil type, land-

use, and land management operations.

CanSWAT is calibrated to adequately simulate flow and water quality constituents.

The calibrated model is a good representation of the rainfall-runoff relationship in the

Rouge River watershed.

Reforestation can reduce sediments and nutrients delivered into the Lake Ontario from

the watershed.

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Thank YouThank You

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