Stream Solute Dynamics: Non-Conservative Behavior

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Stream Solute DynamicsNon-Conservative Behavior

• Lecture 19

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Outline for the week

• Slug vs constant rate additions
• Estimates of discharge
• Estimates of lateral inflow
• Hyporheic dynamics
• In-stream storage and transport
• Conservative vs Non-Conservative solutes
• Spiraling length and uptake
• Relationships to stream ecology

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What we know so far

• Conservative solute behavior
• Slug vs continuous additions
• ?Concentration as f(time)
• ?Concentration as f(distance)
• Transient vs Hyporheic storage
• OTIS equation and model
• Now, non-conservative solute behavior

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The OTIS Model Equation
Dispersion f(stream area, dispersion
coefficient solute gradient)
Advection f(velocity, solute gradient)
Change in stream concentration over time
Transient storage exchange f(exchange
coefficient, concentration difference,
transient storage fraction) Not necessarily
hyporheic!!
Lateral input f(lateral velocity,
concentration difference) This is groundwater
dilution
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What is non-conservative behavior?
Concentration ( of initial)
Chloride
Nitrate
Phosphate
Distance Downstream (m)
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The nutrient spiraling concept
NOTE SW gtgt SB
Flow
Open-channel Transport
Benthic Transport
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Quantifying SW
Ln(Corrected Concentration)
Chloride
Nitrate
Phosphate
Distance Downstream (m)
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How the S correction works
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Uptake Metrics
Uptake length (m)
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The River Continuum Concept