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Invest 2.2.1 Hydropower Production model. Yonas Ghile. Talk Overview. Why care about ecosystem services InVEST Hydropower production Model Hands-on Exercise. Why Care About Ecosystem Services?. InVEST : Science in a Simple Tool.

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Invest 2.2.1

Hydropower Production model

YonasGhile


Talk Overview

  • Why care about ecosystem services

  • InVEST

  • Hydropower production Model

  • Hands-on Exercise



InVEST: Science in a Simple Tool

Integrated Valuation of Ecosystem Services and Tradeoffs


InVEST Attributes

  • Evaluate change

  • Biophysical & monetary

  • Open source

  • Multiple services

  • Spatially explicit

  • Production functions

Models

Simple

Complex

Data

Tier 0

Tier 1

Tier 2

Tier 3


Water Yield for

Hydropower

Irrigation

Drinking Water

Water Yield

Pollution Dilution


Questions you get answers

  • How much water is available?

  • Where does the water used for hydropower production come from?

  • How much energy does it produce?

  • How much is it worth?


Informs Policy Makers to

  • Focus protection on areas that contribute the most.

  • Design management practices that lead to minimal loss.

  • Identify places where other economic activities will conflict with hydropower production.

  • How much hydropower will we gain or lose under future management or conservation plans?

  • Create payment programs to get most return on investment (with Tier 2 model).


Model Architecture

Land Use

Climate

Soils

Water Yield Model

E(t)

P(t)

Evapo-transpiration

Water Yield

Price

Turbine

Eff.

Dam Height

Consumptive Use

Q(t)

Net Volume

Hydropower and Valuation Model

Water Scarcity Model

Energy

Energy Value


Water Yield

Transpiration

Precipitation

Evaporation

Rain

Leaf type

Snow

Plant type

Seasonality

Fog

Yjx

Root depth

Inflow

annual average water yield per pixel

Water Availability


$####.##

Valuation


Model Strengths

  • Uses readily available and minimum data.

  • Simple, applicable and generalizable

  • Spatially explicit

  • Link the biophysical functions to economic values

  • Values each parcel on the landscape


Model Limitations

  • Neglects extremes and seasonal variation of water yield

  • Neglects surface-deep groundwater interactions

  • Assumes hydropower production and pricing remain constant


Calibration and Validation

  • Sensitivity Analysis to identify most sensitive parameters

  • Model Calibration using long term average actual data

    • Find land use parameters within acceptable ranges

    • Model parameter (Zhang constant)

  • Validate Model by conducting comparisons with observed data or other model output


InVESTvs SWAT


InVESTvs SWAT


Hianan Island China

R² = 0.97


And Many Other Sites

West Coast

East Coast

Hawai’i

Belize

China

Colombia

Uganda

Mexico

Ecuador

Amazon Basin

Tanzania

Indonesia


Hands-on Session

  • Run the water yield model


Hands-on Session

  • Run the water scarcity model


Hands-on Session

  • Run the hydropower and valuation model


Hands-on Session

Think how you would use theWater Yield Model in your work?


Coming up in InVEST

  • Regionalizing the Zhang constant

  • Automating calibration technique

  • Monthly model

  • Groundwater recharge index

  • Tier 2 water yield model

I(t)

P(t)

Irr(t)

Sm(t)

Qf(t)

E(t)

If(t)

S(t)

Bf(t)


UPYRB Example


How does it work
How Does it Work?

  • Water Yield is the water depth (volume) that is NOT Evapotranspired: WY = P – AET

  • It is the sum of Surface flow, subsurface flow and groundwater flow: WY = SR + SubSR + GW

  • Model: WY = P * (1 – AET / P )

E(t)

P(t)

Q(t)


Energy calculation
Energy Calculation

outflow rate

head

pd = d.qd.g.hd

gravity constant

water density

outflow

=0.00272


Valuation
Valuation

  • Total Value of the Hydropower:

  • The Sub-basin’s Hydropower production Value:

=


Data requirements
Data Requirements

Inputs

Process

Outputs


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