regional district of nanaimo water budget project ... › wp-content › uploads › 2015 › 01 ›...
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WaterTech 2013
Jamie Wills (Waterline Resources Inc.) Jon Paul ‘JP’ Jones (AITF & U Waterloo)
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What is GW-SW interaction? Why is it important? GW-SW interaction and oil sands How it is typically assessed? Where confusion arises
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A hydraulic connection between subsurface water (groundwater, GW) and surface water (SW)
Water flow can be directed from: GW ’ SW (discharge) SW ’ GW (recharge) Both ways
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Jyrkama (2003)
GW discharge to SW body. The opposite can also occur.
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http://pubs.usgs.gov/circ/circ1139/htdocs/natural_processes_of_ground.htm
On the 3 figures compare the elevations of water table and river to resolve flow direction
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GW-SW interaction a function of: Darcy Law (q = Ki)
Hydraulic head differences (i) Hydraulic conductivity (K)
Topographic lows (commonly GW discharge areas)
Topographic highs (common GW recharge areas)
Main GW-SW controlling factor = K
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GW flow rates (v = Ki/porosity[n]) through typical Alberta clay till.
Assuming K = 1 x 10-8 m/s, n of 30%: GW flow rate (v) to SW body of ~1 cm/yr (assuming 1% hyd. grad.) v increases to ~10 cm/yr (assuming 10% hyd. grad.) Note: the flow rate is directly proportion to K of saturated medium, and
flow rates can be much higher in high K saturated media
GW recharge rate (infiltration of precipitation)
through typical Alta clay till: Commonly reported at ~2 % of precipitation Yields a GW recharge rate of 8 to 12 mm/yr (based on typical Alta.
precipitation range of approx. 400 to 600 mm/yr)
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GW – SW interaction at oil sands projects: Often assumed that GW-SW interaction represents an important
component of the local hydrologic regime Assumption often invalid due to low K of subsurface media There are notable exceptions
Existing/planned mining and in-situ projects must assess it Condition of operating approval of existing oil sands projects Condition of TOR of new oil sands project applications GW-SW assessment reviewed at:
Local and stakeholder level Provincial level Federal level
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How/where is it typically addressed in new oil sands project applications? Hydrogeology Baseline Report of EIA Hydrology Baseline Report of EIA
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How is it (or could it) be addressed in the Hydrogeology Baseline Report? Qualitatively
Discuss based on lithology and expected flow regime Quantitatively
MWs, seepage meters, diffusion membrane samplers, etc Darcy-type calculations Chemistry (dissolved, stable and radioactive isotopes) Numerical modelling (changes in discharge rates to SW bodies)
Both may be used as GW-SW interaction = inexact science
It is crucial that all parties recognize this fact
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How is it typically addressed in the hydrology baseline report? Qualitatively
Use of text consistent with the Hydrogeology Baseline Report Quantitatively (may or may not be completed)
Calculate a water balance for a given watershed or SW body The GW term is assumed to be equal to the difference (either +
or -) between input terms and output terms: Depending on + or -, infer whether GW is discharging into or
out of the SW body Method inaccurate due to uncertainty with accurately
quantifying main terms in water balance equation
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Where confusion arises Lack of commun. between hydrogeologist and hydrologist Where reviewer’s expectation of the accuracy of the GW-SW
interaction predictions are not met Where predictive results are over sold
All of the above promote: Ongoing confusion Increased SIRs from regulatory bodies and stakeholders A prolonged approval process
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All is not lost because smart people have sorted out managing uncertainty… Albert Einstein (1879-1955); Isaac Newton(1642 – 1727); William
of Ockham (1285–1349); Ptolemy (90-168); Aristotle (384-322)
They agreed that when you have competing theories that make exactly the same predictions, the simpler one is typically the better… “Pluralitas non est ponenda sine neccesitate”
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We also have improved numerical modelling tools and approaches to help us resolve GW-SW interaction As detailed in Part 2 of presentation (JP Jones)”
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An Improved Method to Assess Groundwater –
Surface Water Interaction in Oil Sands Projects: Part 2
Jamie Wills (Waterline Resources) Jon Paul ‘JP’ Jones (AITF & U Waterloo)
WaterTech 2013 Conference, Banff, AB, April 10-12
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For all Modelling Work (in the Oil Sands or Anywhere else), One Should Always Strive Towards One Simple Goal…
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Avoiding This Situation
Modeller
Regulators & Clients
SOCIALisBETTER Photostream Flickr.com CC BY 2.0
Bioxid’s Photostream Flickr.com
CC-BY-SA 2.0
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Examples of Traditional Hydrological Modelling Tools
MODFLOW FEFLOW HSPF SWAT
These Are All Fine Tools When Applied
Competently Within Their Respective Domains But Results Can Be Considerably More
Uncertain When These Tools Are Applied To Situations They Were Not Meant For
Groundwater
Surface Water
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The Hydrologic Cycle
Jyrkama 2003
• Many Common Models Treat GW & SW Hydro Regimes as “Nearly” Isolated Systems
• This Approach Has a Number of Severe Limitations
• Often Desirable to
Instead Think of the System as a Single, Interactive Resource
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Possible Issues With Traditional Models Used In The Oil Sands
Key Hydrological Processes May be Missing or Overly Simplified
Discontinuities in Flow and Solute Transport Pathways Between Surface and Subsurface
User-Defined Parameterization of Processes Across
the Land Surface Interface (aka let “Physics” deal with this, not the modeller)
Lack of Dynamic Feedback
Large Number of Problems that Cannot be Addressed
with these Types of Models
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Integrated Models
aka GW-SW Interaction Models aka Conjunctive Models
Able to address the Major Issues Associated with
Traditional Hydrological Models
Starting to be used in the Oil Sands and across Alberta BUT! Integrated Models are not a Panacea Like Traditional Models, they have their own
‘quirks’ Data availability/quality is an issue for all modelling
endeavors (as is predictive uncertainty) Steeper learning curves, user competency becomes
even more important
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Examples of Integrated Models
HydroGeoSphere (AQUANTY)
MIKE SHE (DHI)
GS-FLOW (USGS)
MODHMS (HydroGeologic)
FEFLOW/MIKE 11 (DHI-WASY)
Jones et al (2006)
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Closure
Thank you Questions?