watershed management and modeling engineering with nature ... · design of a new mouth for the don...

Watershed Management And Modeling

Engineering With Nature – Proposed Design Tool


1) Gridded Surface Subsurface Hydrologic Analysis (GSSHA)2) Nutrient Simulation Module3) Contaminant Simulation Module4) Mercury (HG) Simulation Module5) Riparian Vegetation Simulation Module

Existing ERDC Tools and Modules

Models and Modules need to be integrated


GSSHA Modeling Capabilities

Evapotranspiration

Stream Network

Overland Flow

Infiltration

Groundwater Reservoirs and Detention Basins

Wetlands

Storm and Tile Drain Networks

Water Quality

ErosionErosionFrozen Ground

and SnowFrozen Ground

and Snow

Water temperature modelling is in progress


Nutrient Simulation Module I (NSMI)

Bed sediment

OrgN NH4

NO3

OrgP TIP

POC DOC DIC

∑CBODPOM

DO

Ap Ab

Alkalinity

Pathogen

N2

Water column Uptake

Oxidation

Decay

Decay

Mortality

Nitrification

Hydrolysis

Release

Respiration Dissolution

Decay

SOD

Denitrification

SettlingAtmospheric reaeration

Reduced State Variable list for N, P,

and C cycles


Nutrient Simulation Module II (NSMII)

RDOCLDOC

RPOCLPOC

Bed sediment

DON NH4

NO3

DOP TIP

DIC

∑CBOD

DO

∑Ap Ab

Alkalinity

Pathogen

RPOPLPOP

RPONLPON

CH4 HxS

DSiBSi

Water column

Nitrification

Uptake

Mortality

SOD

Dissolution

Denitrification

Oxidation

Atmospheric reaeration SettlingRespiration Hydrolysis Mineralization

Release

Expanded State Variable list for N, P,

and C cycles

More Algal groups

Bed Sediment Diagensis


Sediment Diagenesis ModuleWater

Sedimen

t laye

r 1Se

dimen

t laye

r 2

Diagenesis

POCG1,2

CH4, H2S,

NH3, CO2

POCG3,2

POCG2,2

PONG1,2

PONG3,2

PONG2,2

POPG1,2

POPG3,2

POPG2,2

PON

POP

POC Diagenesis

Diagenesis

CH4

NH4 (d)

PO4 (d)

H2S (d)

NO3

Partitioning

Burial

CH4

H2S (d)

NH4 (d)NO3

PO4 (d) Partitioning

Particle mixingDiffusion

Burial

CH4 H2S NH4NO3 DIP

BSi Si (d)

Si (d)

DSi

Dissolution

NH4 (p)

PO4 (p)

H2S (p)

Si (p)

Partitioning

Partitioning

Partitioning

H2S (p)

NH4 (p)

PO4 (p)

Si (p)

Ap, POC, PON, POP, BSi

Dep

osition

Transfer

Detailed Water Quality Analysis of Bed Sediments


Contaminant Simulation Module

DOC Sorbed Phase

Dissolved Phase

Diffusion

Diffusion

Dep

osition

Resuspen

sion

Burial

Volatilization

EquilibriumEquilibrium

Non‐equilibrium

Equilibrium Equilibrium

Non‐equilibrium

Water column

Bed sediment

Sorbed Phases

Algae POM Solids

DegradationTransformations

DegradationHydrolysisPhotolysis

Transformations

Sorbed Phases

POM SolidsDOC

Sorbed PhaseDissolved Phase

Dep

osition

Detailed Analysis of Chemicals and Metals. Water Column and Bed Sediment Interactions.


Hg Simulation Module

Hg0

Photodegradation

Oxida

tion Reduction

Volatilization

MethylationDemethylation

Diffusion

Depo

sitio

n

Resuspen

sion

Depo

sitio

n

Diffusion

Depo

sitio

n

Resuspen

sion

Depo

sitio

n

Burial BurialMethylation

Demethylation

Water column

Bed sediment

HgII

Algae POM SolidsDissolved DOC

MeHg

AlgaePOMSolids DissolvedDOC

HgII

POM SolidsDissolved DOC

MeHg

POMSolids DissolvedDOC

Detailed Analysis of Mercury Dynamics. Water Column and Bed Sediment Interactions.


Vegetation Dynamics

Riparian Vegetation Simulation Module

(RVSM)

Nutrient Simulation Modules (NSMs)Advance time, t, by time step

Advance cross section, i

Advance points, k, within cross section

Establishment Module

Growth Module

Mortality Module

Is k > number of points in cross‐

section

Is i > number of cross‐section

Is t > end time

N

N

N

Y

Y

End

Y


Vegetation and Nutrient Interactions

Building upon current riparian vegetation and nutrient simulation

modules while developing new riparian vegetation/nutrient interaction

capabilities.

VegetationNutrient pools

Literature Review done but not

implemented within RVSM yet.

Will support BMP for load reductions. Need to expand to include Chemicals and Metals.


Dynamic Vegetation Roughness

As Vegetation grows and

dies, Hydraulic Roughness is allowed to change.


The Toronto Lower Don Landsproject combined:

Design of a new mouth for the Don River,

Design of engineered control structures,

Detailed hydraulic and hydrodynamic flood

modeling, Permitting, and

Urban design/ landscape architecture for a new district

of the City of Toronto.

Example EWN Projects to be Supported


DALLAS, TX TRINITY RIVER

Dallas, TX – Trinity River Project Includes:

River Channel modification / stream geomorphology

Wetlands creation Park and trail planning Flood management Sediment management Corps permitting and levee

management

Example EWN Projects to be Supported


Provides a physically based modeling system that computes flows, sedimentation, water quality, and vegetation growth and mortality

Supports man‐made and nature based features in urban settings

Allows for fine scale project features Supports USACE mission in flood control while

incorporating nature based features in support of planning and engineering design projects

Summary

watershed management and modeling engineering with nature ... · design of a new mouth for the don...

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