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2 cards from this section. Quick, good the night before a test.
What is the basic assumption of a box model?
Think about how mixing affects concentration.
What does steady-state mean in environmental systems?
Consider balance in flows.
What is a primary assumption of the box model?
Consider what simplifications the model offers.
Steady-state implies:
Relate this to balance concepts.
Consider a river system with three pollutants entering from different sources. Source A introduces 50 kg/day, Source B introduces 30 kg/day, and Source C introduces 10 kg/day. If the river flows at a steady rate, how much pollution will be present downstream if all pollutants are uniformly mixed and the total daily outflow is 80 kg?
Combine inputs and compare with outflows to determine equilibrium.
A scientist is studying the oxygen balance within a lake modeled as a box. If 100 kg/day of oxygen enters the lake while 60 kg/day is consumed by biological processes and evaporation loses 20 kg/day, calculate the total change in oxygen concentration over a day in a lake with a volume of 500 m³.
Use the net balance approach to compute the concentration change.
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