Understanding and Applying the Exner Equation
Department of Geology & Geophysics/University of Minnesota
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This page first made public: Jul 14, 2006
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The Exner equation lends itself readily to visualization and physical examples; it is far more important in quantitative sedimentary geology than the usual topics from fluid mechanics that are included in undergraduate sedimentary geology texts. We will look 'under the hood' of the Exner equation and discuss what its terms mean and how to present it to undergraduates with emphasis on building intuition rather than mathematical solution methods.
undergraduate required course in sedimentary geology
Skills and concepts that students must have mastered
How the activity is situated in the course
topic presented early in the course, just after sediment properties
Content/concepts goals for this activity
Higher order thinking skills goals for this activity
ability to understand physical meaning of terms in a simple but crucial differential equation; relation of mathematics to nature; estimation and simplification
Other skills goals for this activity
Description of the activity/assignment
The Exner equation describes the mass balance for sediment deposition and erosion. The original version embodies the main short-term processes of deposition and creation of the stratigraphic record is created. It can easily be modified to include additional processes like subsidence, compaction, and carbonate or evaporite formation. The Exner equation is far more important in quantitative sedimentary geology than the usual topics from fluid mechanics that are included in undergraduate sedimentary geology texts.
The goal is to take the equation apart to help undergraduates develop a physical intuition for what they mean and how they can be estimated using simple measures like length and time scales. The emphasis is on building intuition rather than mathematical solution methods.
Determining whether students have met the goals
5-minute example estimation problems, in class; somewhat longer homework problems
More information about assessment tools and techniques.
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