Tools for Wetlands Permit Evaluation: Modeling Groundwater ... · Tools for Wetlands Permit...

US Army Corpsof Engineers Engineer Research & Development Center

Tools for Wetlands PermitEvaluation: ModelingGroundwater and Surface WaterInteraction

Cary TalbotCoastal & Hydraulics Laboratory

Example Wetland PermitProblem� Applicant claimed proper drainage ditch

maintenance would reduce acreage classifiedas wetland in proposed development area

Example Wetland PermitProblem� Applicant used various analytic 1-D

approaches along with a 3-D saturated flow-only groundwater model (MODFLOW) toestimate drainage

� No surface water-groundwater interactioneffects simulated

Typical Wetland System withSurface Water Flow Channels

EM 1110-2-1421 ~Groundwater Hydrology

“Although mathematically exact, analytic models generally canbe applied only to simple one-dimensional problems because ofrigid boundary conditions and simplifying assumptions.However, for many studies, analysis of one-dimensional flow isnot adequate. Complex systems do not lend themselves toanalytical solutions, particularly if the types of stresses acting onthe system change with time. Numerical models allow for theapproximation of more complex equations and can be applied tomore complicated problems without many of the simplifyingassumptions required for analytical solutions…” (emphasisadded)

� Section 6-11, Numerical Modeling of Surface Waterand Groundwater Systems:

“…Ideally, a computer model of the surface-water/groundwaterregime should be able to simulate three-dimensional variably-saturated flow including: fluctuations in the stage of the surface-water body, infiltration, flow in the unsaturated zone, and flow inthe saturated zone. Additionally, simulation of watershed runoff,surface-water flow routing, and evapotranspiration will allow forcompleteness. However, this is often a complex task, and nomatter how powerful the computer or sophisticated the model,simplifying assumptions are necessary.” (emphasis added)

� Section 6-11, Numerical Modeling of Surface Waterand Groundwater Systems (cont.)

System-Wide Water ResourcesProgram (SWWRP)� 7-year USACE R&D initiative designed to

assemble and integrate the diversecomponents of water resources management

� The ultimate goal is to provide to the Corps,its partners, and stakeholders the overalltechnological framework and analytical toolsto restore and manage water resources andbalance human development activities withnatural system requirements

https://swwrp.usace.army.mil

SWWRP Program StructureC

orps Bu

siness Lin

USACE/National Water Resource Needs

Regional SedimentManagement

• River Basin Morphology,Modeling, & Management• Coastal Morphology,

Modeling, & Management• Sediment Management

Methods• Sediment Processes

Studies

Regional WaterManagement

•Watershed HydrologySimulation• Riverine & Estuarine

Simulation• Coastal Simulation•Water Processes &

Assessments

EcosystemAssessment &Management

• LandscapeAssessment• Transport Modeling• Ecological Modeling• Ecosystem ResponseForecasting• Ecosystem Processes

Unifying Technologies• Integrating Frameworks• Data Management• Geospatial Applications Development• Regional Measurement and Monitoring• Model Integration• Decision Support and Knowledge Management

SWWRPWatershed Hydrology Simulation� 5 research areas

� HMS development� GSSHA development� Uncertainty/parameter estimation/stochastic

simulation tools for system-scale models� Regional flood prediction� Coupled, multi-dimensional groundwater-surface

water interaction simulation

USACE Toolbox ofGW-SW Interaction Codes� Coupled, multi-dimensional, SWWRP-

supported GW-SW interaction codes� GSSHA� WASH123D� ADH

� All codes fully integrated and supported inXMS (GMS, SMS, WMS)

GSSHA� Distributed, physically-based Gridded Surface

Subsurface Hydrological Analysis (GSSHA)model

� Simulates 2D overland flow, 1D channelrouting, 2D saturated groundwater flow,canopy retention, microtopography, 1Dinfiltration and ET using finite-difference andfinite-volume methods

WASH123D� Water flow and contaminant and sediment

transport in WAterSHed systems

� First-principle, physics-based finite elementwatershed model simulating 1D canal, 2Doverland and 3D subsurface flow andtransport

WASH123DC-111 SpreaderCanal Mesh

Biscayne BayCoastal Wetland

ADH� ADaptive Hydrology/Hydraulics model that

simulates flow and transport in coupledsurface water - groundwater systems

� Modular, parallel, adaptive finite elementsimulation of 2D and 3D dynamic wavesurface water and 3D Richards’ equationgroundwater flow and transport

ADH GW-SW InteractionCapabilities� Coupled 3D groundwater and 2D surface water

(diffusive wave and full shallow water) equations� Flux-based communication avoids switching flux/head

boundary� Dual-valued (SW/GW) nodes on ground surface� Communication interval is time step� Separate solves maintain reasonable sizes for the

linear systems� Potential for different time advancement for the

hydrologic components

Pool 8 GW-SW ADH ModelSurface Water Depths Groundwater Heads

GSSHA Wetland Example

Coon Creek Watershed

Coon Creek Watershed� Locate 1600 acre wetland in watershed

southwest of Chicago� Remove tile drains� Assess impacts of future use

Wetland Placement

Current Status of GW-SWInteraction Toolbox Codes� GSSHA

� Fully supported in WMS version 7.x� http://chl.erdc.usace.army.mil/software/wms

� WASH123D� Fully supported in GMS version 6.0beta� http://chl.erdc.usace.army.mil/software/gms

� ADH� Supported in GMS version 5 but full support still

under development

SWWRP Deliverables� Improve infiltration modeling speed by finding

physically-based alternatives to Richards’equation

� Addition of 3D unsaturated flow to GSSHA� Completion of ADH interface development� Guidance on selection of appropriate physical

processes in GW-SW interaction models� Incorporation of ecological and sediment

modeling tools developed in other SWWRPefforts

� Merging of ADH and WASH123D capabilitiesinto single model

Conclusions� Coupled, multi-dimensional GW-SW

interaction codes are needed in complexwetland studies (EM 1110-2-1421)

� Currently, several tools exist for performingsuch studies

� SWWRP is continuing the development ofthese tools

Questions? Comments?� https://swwrp.usace.army.mil� Cary.A.Talbot@erdc.usace.army.mil

Tools for Wetlands Permit Evaluation: Modeling Groundwater ... · Tools for Wetlands Permit...

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