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© 2014 HDR, Inc., all rights reserved.

Lake Symposium

October 9, 2014

Contract No. 58100001Project Code No. 5810

New England Clean Power Link Preliminary Water Quality Modeling

- Mike3 Model

- Model Inputs

- Results

- Summary

- Questions

N

UTM Coords (m)

PRELIMINARY MODELING – SUBJECT TO CHANGE

Mike3 Model

Danish Hydraulics Institute (DHI)• Widely Used• Well Tested

Features:• Three-dimensional• Time-variable• Flexible Mesh• HD – Hydrodynamic Module• MT – Mud Transport Module


North grid: 2,425 cellsSouth grid: 3,300 cells20 sigma layers


Finer Model Segmentation

15 m resolution at selected cross-sections


Hydrodynamic Model Input

• Bathymetry - Vermont Center for Geographic Information

• Flows – 30 Rivers - USGS, Environment Canada, Quebec Ministry of Sustainable Development Environment and Parks

• Meteorology – Northeast Regional Climate Center


Water Quality Model Input

• Loading rates– Total Suspended Solids (TSS)– Heavy Metals– Phosphorus

• Settling rate– Medium silt– Stokes Law

• Loading added to bottom layer


Loading Information

• Sediment (Marine Research Corp., 2014; HDR, 2010)

• Metals (HDR, 2010)– 46 sites– As, Cd, Cu, Pb, Ni, Zn, Ag, and Hg

• Phosphorus (Cornwell and Owens, 1999)– 19 sites

• Partition coefficients (EPA/600/R-05/074)– Median valuesPRELIMINARY MODELING – SUBJECT TO CHANGE

Sediment Characteristics

Sediment type Saturated Bulk Density(g/cm3)

Porosity(%)

Lake Champlainsediments

1.2-1.4 87-92

Champlain Sea sediments

1.49-1.69 60-70

Lake Vermont sediments 1.7 -2.2 40-60

The majority of sediment was found to be Lake Champlain sediments

Marine Research Corp., 2014


Loading Calculation

Q = A x V x RQ – FlowA – Cross Sectional AreaV – Plow VelocityR – Release Fraction

North Lake (MP 0-73)o Jet Plowo A = 1.1 m2

o V = 1.5 mi/d (0.028 m/s)o R = 0.30

South Lake (MP 73-97)o Shear Plowo A = 0.25 m2

o V = 1.5 mi/d (0.028 m/s)o R = 0.02

W = Q x CW – LoadC - ConcentrationPRELIMINARY MODELING – SUBJECT TO CHANGE

TSS MP 06

Cable Route

400 ft. Corridor (approximate)



Solid Phosphorus MP 06

Cable Route




Dissolved Phosphorus MP 06

Cable Route




Dissolved Copper MP 06

Cable Route




Constituent Time Series MP 6 (maximum)

050

100150200250300350400450500

0:00 4:00 8:00 12:00 16:00 20:00 0:00

TSS

(mg/

L)

Elapsed Time

TSS

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

0:00 4:00 8:00 12:00 16:00 20:00 0:00

P (m

g/L)

Elapsed Time

Solid Phosphorus

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0:00 4:00 8:00 12:00 16:00 20:00 0:00

P (m

g/L)

Elapsed Time

Dissolved Phosphorus

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

0:00 4:00 8:00 12:00 16:00 20:00 0:00

Cu

(ug/

L)

Elapsed Time

Dissolved Copper


TSS MP 50

Cable Route




Solid Phosphorus MP 50

Cable Route




Dissolved Phosphorus MP 50

Cable Route




Dissolved Copper MP 50

Cable Route




Constituent Time Series – MP 50 (maximum)

020406080

100120140160180200

0:00 4:00 8:00 12:00 16:00 20:00 0:00

TSS

(mg/

L)

Elapsed Time

TSS

0.000.050.100.150.200.250.300.350.400.450.50

0:00 4:00 8:00 12:00 16:00 20:00 0:00

P (m

g/L)

Elapsed Time

Solid Phosphorus

0.00

0.02

0.04

0.06

0.08

0.10

0:00 4:00 8:00 12:00 16:00 20:00 0:00

P (m

g/L)

Elapsed Time

Dissolved Phosphorus

0

1

2

3

4

5

6

7

0:00 4:00 8:00 12:00 16:00 20:00 0:00

Cu

(ug/

L)

Elapsed Time

Dissolved Copper


Summary

• TSS and Phosphorus concentrations are temporally elevated within 200 ft. of the installation, but quickly return to background levels (TSS <2 hours, P <1 day).

• For all metals, the concentrations will be below the new acute and chronic criteria concentrations within 200 ft. of the installation.


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