4.1 - Lakes
Enroll to start learning
You’ve not yet enrolled in this course. Please enroll for free to listen to audio lessons, classroom podcasts and take practice test.
Practice Questions
Test your understanding with targeted questions
Define molecular diffusion.
💡 Hint: Think about how smell spreads in a room.
What is bulk flow?
💡 Hint: Consider how a river carries debris downstream.
4 more questions available
Interactive Quizzes
Quick quizzes to reinforce your learning
What is the primary mechanism of mass transfer in a deep lake with low flow?
💡 Hint: Consider what happens when water isn’t flowing.
True or False: Advection is always present in lakes.
💡 Hint: Think about conditions where water remains still.
1 more question available
Challenge Problems
Push your limits with advanced challenges
A chemical spills on the surface of a stratified lake in winter. Predict the timeline for how the chemical will reach the bottom of the lake considering diffusion and thermal convection.
💡 Hint: Consider how long it takes for diffusion depending on the concentration gradient and water’s temperature.
Evaluate the effectiveness of removing pollutants from a lake through a pumping system versus natural diffusion. Analyze potential impacts of bulk flow and stratification.
💡 Hint: Think about how mixing can enhance pollutant removal compared to simple diffusion.
Get performance evaluation
Reference links
Supplementary resources to enhance your learning experience.