# Unit information: Geophysical Fluid Dynamics in 2021/22

Unit name Geophysical Fluid Dynamics EASC30074 10 H/6 Teaching Block 2C (weeks 13 - 18) Professor. Mader Not open Mandatory units in Years 1 and 2 of BSc or MSci Geophysics or Environmental Geoscience. The material in the unit ranges from the descriptive to the theoretical. To cope with the theory, students also need to have a good understanding of basic physics concepts and be confident with algebra and basic calculus. Environmental Geoscience students with a limited background in physics and maths who are considering this unit as an option need to be aware that successful completion will involve additional effort. In order to help such students, 3 tutorials are provided before the start of the unit to introduce the ideas of vector calculus that will be used in the unit. N/A School of Earth Sciences Faculty of Science

## Description including Unit Aims

This unit is aimed at developing a quantitative description and understanding of natural flows. This will involve a consideration of the flow of natural, multiphase materials in viscous, inviscid and turbulent flow. The fluid mechanical principles of heat and mass transfer in fluid flows will be applied to understanding geophysical phenomena. The impact of the Earth's rotation on large-scale fluid motions will also be discussed.

Specific geophysical flows of interest will be: the flow of ice and magma; plate motions and the viscosity of the mantle; convective flows; flows in the Earth's atmosphere and oceans.

## Intended Learning Outcomes

On successful completion of the unit students will be able to

• Explain and apply some of the basic laws governing geophysical fluid flows.
• Understand the principles that govern different types of flow and the importance of flow regime.
• Be able to explain the origin of turbulence and be able to distinguish in detail between viscous, inviscid and turbulent flow behaviours.
• Understand the principles of dimensional analysis and be able apply these to constrain the dynamics of geological flows.
• Be able to explain the behaviours of Earth materials (e.g. air, water, magma, mud and various multiphase mixtures).
• Understand the principles that govern natural convection including thermal, compositional and phase change effects, and apply this understanding to magma chambers and convection in the Sun's interior.
• Understand the effect of the Earth's rotation on large scale fluid motions in the atmosphere and oceans and be able to explain the nature and origin of the Coriolis force.
• Explain and apply standard measurement techniques for determining the viscosity of various fluids including multiphase mixtures and be able to interpret flow-curves.
• Understand the principles of buoyancy-driven flows and be able to apply these to the dynamics of volcanic eruption columns, pyroclastic flows, and turbidity currents.

## Teaching Information

The unit will be taught through a combination of asynchronous and synchronous online materials and events and, if possible, synchronous face-to-face contact (depending on the circumstances).

• lectures
• office hours
• directed individual formative activities and exercises
• practical work in the laboratory

Students who either begin or pursue their studies in an online mode may be required to complete laboratory work, or alternative activities, in person in order to meet the intended learning outcomes for the unit, prepare them for subsequent units or to satisfy accreditation requirements.

## Assessment Information

Assessment for learning/formative assessment:

• Two practicals (examples classes) and homework exercises with worked solutions provided online.

Assessment of learning/summative assessment:

• Laboratory notebooks for two laboratory practicals (30%)
• End-of-unit 2-hour examination on lectured material and guided reading (70%)

## Resources

If this unit has a Resource List, you will normally find a link to it in the Blackboard area for the unit. Sometimes there will be a separate link for each weekly topic.

If you are unable to access a list through Blackboard, you can also find it via the Resource Lists homepage. Search for the list by the unit name or code (e.g. EASC30074).

How much time the unit requires
Each credit equates to 10 hours of total student input. For example a 20 credit unit will take you 200 hours of study to complete. Your total learning time is made up of contact time, directed learning tasks, independent learning and assessment activity.