WEAP-MODFLOW Decision Support System Decision Support ... · Management, Protection and Sustainable Use of Water and Soil Resources. WEAP-MODFLOW Decision Support System Decision

Dresden12.-13. 10. 2011

1Arab-German Cooperation Project: (www.acsad-bgr.org):Management, Protection and Sustainable Use of Water and Soil Resources

WEAPWEAP--MODFLOW MODFLOW Decision Support SystemDecision Support System for IWRM for IWRM

-- Optimization of Groundwater Abstraction Rates Optimization of Groundwater Abstraction Rates --

Jobst Maßmann(1), Issam Nouiri(2), Klaus Schelkes(1), Abdallah Droubi(3)

The Federal Institute for Geosciences and Natural Resources (BGR), Hannover, GERMANY

National Institute of Agronomy of Tunisia (INAT), Tunis, TUNISIA

The Arab Centre for the Studies of Arid Zones and Dry Lands (ACSAD), Damascus, SYRIA

(1)

(2)

(3)

Dresden12.-13. 10. 2011


Technical Cooperation Project:

Aim:

“Management, Protection and Sustainable Management, Protection and Sustainable Use of Groundwater and Soil Resources in the Arab RegionUse of Groundwater and Soil Resources in the Arab Region”

www.acsad.org, www.bgr.de, www.acsad-bgr.org, www.bmz.de

The Federal Institute for Geosciences and Natural Resources (BGR),

Hannover, GERMANY

The Arab Centre for the Studies of Arid Zones and Dry Lands (ACSAD),

Damascus, SYRIA

Development, application and dissemination of a Decision Support System (DSS) for

Integrated Water Resources Management (IWRM) in the Arab Region

Dresden12.-13. 10. 2011


Decision Support System (DSS) Decision Support System (DSS) for Integrated Water Resources Management (IWRM)for Integrated Water Resources Management (IWRM)

Tasks of a DSS for IWRM• Analysis of the present water management in a

complex interacting system

• Evaluation of future scenarios, taking into account

- change of water demand and resources (climate change, socio-economic development, …)

- different water management options[Koudstaal et al. 1991]

Dresden12.-13. 10. 2011


WATER EVALUATION & PLANNING SYSTEM - www.weap21.org

All processes are modeled by nodes and links

The base is the water balance in a catchment

Dresden12.-13. 10. 2011


WEAPWEAP--MODFLOW LinkageMODFLOW LinkageGroundwater is the main water

resource in the Arab Region

Detailed information about groundwater drawdowns and flows

are of special interest

Groundwater flow model is needed!

Groundwater is the main water resource in the Arab Region




Dresden12.-13. 10. 2011


WEAPWEAP--MODFLOW LinkageMODFLOW LinkageGroundwater is the main water

resource in the Arab Region




Groundwater is the main water resource in the Arab Region




Dresden12.-13. 10. 2011


WEAP WEAP –– MODFLOW Applications in the Region MODFLOW Applications in the Region Induced Through Training ActivitiesInduced Through Training Activities

WEAP-MODFLOW DSS applications support local water institutions

Dresden12.-13. 10. 2011


WEAP WEAP -- DSS DSS -- EnhancementsEnhancements

MODFLOWIntegration of a 3d groundwater flow model

MABIAEnhanced soil water balance model

MODPATH3d particle tracking model

All_WATER_gw OptimizationOptimization of abstraction rates and pumping allocation

(developed by Issam Nouiri, INAT, Tunisia)

Initiated by the ACSAD-BGR project

Dresden12.-13. 10. 2011


MotivationMotivation

How much water has to be taken from each well?

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MotivationMotivationAbstraction rates and pumping allocation – WEAP solution

WEAPsolutions:

ANo priorities

Quality: 1.1 g/LCosts: 1.3 $/m³

BPriority on well 3

Quality: 0.9 g/LCosts: 1.6 $/m³Unmet demand!

Dresden12.-13. 10. 2011


WEAPWEAP-- OptimizationOptimizationOptimization of abstraction rates and pumping allocation

Optimization:Find the best configuration of a system considering single or multiple objectives and constraints.

Here:Objective functions• Demand satisfaction• Minimization of costs• Sufficient water quality• Minimization of drawdown at well 1

Constraints• Maximal pumping rate• Maximal drawdown

How much water has to be taken from each well?

Dresden12.-13. 10. 2011


WEAPWEAP-- OptimizationOptimizationObjective functions to minimize

• Demand satisfaction

• Minimization of maximal drawdown

• Minimization of costs

• Water quality

⎟⎟⎠

⎞⎜⎜⎝

⎛=

DemandSite

DemandSiteDS Demand

dUnmetDemanf max

⎟⎟⎠

⎞⎜⎜⎝

⎛−

=CellCell

CellDD BottomdInitialHea

DrawDownf max

maxstRateVariableCoFlow

FlowstRateVariableCotingCostFixedOperatCapitalCos

fItem

teratingCosVariableOp

ItemItemItemItem

CItem

⋅

⎥⎥

⎦

⎤

⎢⎢

⎣

⎡⋅++

=

∑

∑ 44444 344444 21

⎟⎟⎠

⎞⎜⎜⎝

⎛ −=

DemandSite

DemandSiteDemandSiteQ nncentratioAcceptedCo

nncentratioAcceptedCoionConcentratf max

Dresden12.-13. 10. 2011


OPTIMIZATION TOOLOPTIMIZATION TOOL

All_WATER_gw(genetic algorithm)

WEAPWEAP--MODFLOWMODFLOW

WEAP

MODFLOW

time step loop

Results

Evaluation of Results

Creation of new input parameters

Input parameters

optimization loop

WEAPWEAP-- Optimization ProcedureOptimization ProcedureStart

Dresden12.-13. 10. 2011


WEAPWEAP-- OptimizationOptimizationOptimized solution

Costs: 1.2 $/m³ [1.3]

Quality: 1.1 g/LDrawdown at well 1 is reduced

Dresden12.-13. 10. 2011


WEAPWEAP-- OptimizationOptimizationCase Study: Zeuss Koutine, Tunisia

10 km

Tunisia

Dresden12.-13. 10. 2011


WEAPWEAP-- OptimizationOptimizationYearly Demand / Supply (2013)

Touristic18 MCM

Villages11 MCM

Groundwater

1.5 g/L

Desalinizationmax 32 MCM

0.5 g/L

Energy needed for wells, transmission and desalinization plants

Dresden12.-13. 10. 2011


WEAPWEAP-- OptimizationOptimizationALL_WATER Optimization tool

Demand satisfaction

Drawdown

EnergyQuality satisfaction

Dresden12.-13. 10. 2011


WEAPWEAP-- OptimizationOptimizationResults case study (2013-2015)

Reference Optimized A

Priority on drawdown

minimization

Optimized B

Priority on energy

minimization

Salinity (g/L), touristic areas 1.0 0.8 0.9

Energy consumption (kWh/m³) 1.4 1.6 1.5

Drawdown, Zeuss WF (m/year) 1.3 0.7 1.0

WEAP-Area: ZEUSS_KOUTINE_Tunisia_2011_10_C_all / ZEUSS_KOUTINE_Tunisia_2011_10_E_cost_opt

Dresden12.-13. 10. 2011


Decision support systems help the decision maker to understand the interacting processes in a catchment and to evaluate action plans

The WEAP-MODFLOW DSS has successfully been applied in many areas in the Arab region and is used

The new Optimization tool ALL_WATER_gw has the capacity to optimize pumping/transmission costs, quality and drawdown, considering restrictions

The WEAP-MODFLOW DSS including the optimization tool is free for developing countries

ConclusionsConclusions

Dresden12.-13. 10. 2011

20

More informationMore information-- www.bgr.bund.dewww.bgr.bund.de/IWRM/IWRM--DSSDSS-- www.weap21.orgwww.weap21.org

THANK YOUTHANK YOU!

More informationMore information-- www.bgr.bund.dewww.bgr.bund.de/IWRM/IWRM--DSSDSS-- www.weap21.orgwww.weap21.org

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WEAP-MODFLOW Decision Support System Decision Support ... · Management, Protection and Sustainable Use of Water and Soil Resources. WEAP-MODFLOW Decision Support System Decision