Year 10 Geography Controlled Assessment

OCR B GCSE Geography

“To what extent is geology the main influence on the distinctive coastal landforms at Hengistbury Head

and Mudeford Spit?”

Name ______________________________________________

Teacher ______________________________________________

Tutor group ______________________________________________

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“To what extent is geology the main influence on the distinctive coastal landforms at Hengistbury Head and Mudeford Spit?”

Key questions

1What does distinctive mean and what distinctive features are at Hengistbury Head?

2What are the distinctive coastal landforms at Hengistbury Head and how are they unique?

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Suggested readingTitle Author / Source What information did you find here?

Hengistbury Head – Explore, Learn, Discover

www.visithengistburyhead.co.uk

Hengistbury Head Local Nature Reserve

http://bit.ly/1wdCvD9

Hengistbury Head Geology

www.hengistbury-head.co.uk/hengistbury-head-geology.php

Hengistbury Head Geology Guide

www.hengistbury.ukfossils.co.uk/geology-guide.asp

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MAP 1. Ordnance Survey map (1:25 000) of study areaAnnotate WHERE you do the different field techniques on here.

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Google Earth satellite image of study area

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http://mapapps.bgs.ac.uk/geologyofbritain/home.htmlBritish Geological Survey map of study area 7

Alluvium & clay.Tidal flats. Marsh & river deposits. Formation of islands.

Ironstone quarry & tip.Cliffs with ironstone deposits. Routinely mined in Victorian era. Formation of quarry pond due to excavation & landslips.

So which factor do you think is the main influence? Why?

GEOMORPHIC PROCESSES:e.g. erosion, deposition, transport (longshore drift)

What does it do?

How influential?

COASTAL MANAGEMENT:

What does it do?

How influential?

GEOLOGY:

What does it do?

How influential?

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What factors can influence the

landforms (beach, headland, spit) and

how do they?

Data Method Limitations Solutions Links to key question

Beach profile

Exposed Groyne Height Measurement

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Methodology grids

Data Method Limitations Solutions Links to key question

Sediment Sampling

Land use / coastal

management map

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Data Method Limitations Solutions Links to key question

Local geology map & geology cross-section

Field Sketches

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Data Method Limitations Solutions Links to key question

Photographs

(Add any other technique you do in here, e.g. questionnaire) 12

Sketch Map 1: Land use & Coastal Management

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Sketch Map 2: Geology & Geomorphic Processes

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Sketch Map 3:

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Sketch any other information you feel relevant here. Remember – be independent, have your own ideas.

ANNOTATED Field Sketch A

16Location: Facing direction:

ANNOTATED Field Sketch B

17Location:Facing direction:

ANNOTATED Field Sketch C

18Location:Facing direction:

Geology cross-section

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SAFETY:Stand about 5metres away from the base of the cliff. Be aware of falling rocks and in poor weather stay clear & do not approach the cliff.

METHOD:Observe the different layers of the cliff. Make a sketch to show these layers. Annotate the sketch to show the different material, e.g. ironstone fragments, sandstone, clay, etc.

You can colour code this back at school, for now use labels & symbols.

If you visit the visitor centre or look at the signs you can find much more information to answer this.

1. How often, on average, do you visit this section of coast?

a. Everyday d. Once a year

b. At least once a week e. This is my first time

c. At least once a month

2. Why do you visit this section of coast?

a. Walks along the beach c. Job (e.g. you work in a local café)

b. For some peace and quiet d. Other _________________

3. How important do you feel it is to protect this section of coast from geomorphological processes on a scale of 1-5

(1 = not important at all, 5 = very important)

4. What is your opinion on the following statements on a scale of 1-5 (1=strongly disagree, 5=strongly agree)

a. Existing sea defences are necessary d. More sea defences should be put in place

b. The sea defences are unattractive e. The spit should be left to natural processes

c. The beaches have been improved by the sea defences

5.

6.

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Que

stion

naire

Res

pons

esQ1 Q2 Q3 Q4

A B C D EQ5 Q6

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5

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Methodology

*Identify 3 sampling sites across the width of the beach to measure your beach profiles – Mark these clearly on MAP 1 p5

For each Site:-

• Place a Ranging Pole at A (as close to the low-tide mark as safe)

• Identify the key points where the slope angle seems to change (eg. Diagram A below) – use each of these points to divide your profile into sections

• Measure the distance between point A and B using a measuring tape (Record this in the tables on the next page)

• Measure the slope angle between point A and B using a clinometer (Record this in the tables on the next page)

• Repeat this process for Sections B-C, C-D, etc

Diagram A

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Section Distance (cm) Angle (°)

A-B

B-C

C-D

D-E

E-F

F-G

G-H

Site 1. LOCATION:

Section Distance (cm) Angle (°)

A-B

B-C

C-D

D-E

E-F

F-G

G-H

Site 2. LOCATION:

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Section Distance (cm) Angle (°)

A-B

B-C

C-D

D-E

E-F

F-G

G-H

Site 3. LOCATION:

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ACTION:• Make a note on Map 1 to show where you did the beach profile.• Write down which groynes you are between (e.g. S5 and S6)• Make a note where you are between the groynes for each profile, e.g. Updrift,

Downdrift, centre of beach.

Methodology1. Lay out a tape measure running from close to

the water (but not in the sea) right along the beach

at the bottom of the groyne. Note the distance.

2. As close to the sea as is safe, place a metre

ruler on the surface of the beach and estimate the height up to the top of the groyne

to measure the amount that is exposed (uncovered).

3. Work your way along the groyne taking a measurement again every 3metres

4. Repeat the exercise for both updrift (direction waves are coming from) and downdrift of the groyne – See Diagram B and C – Record this in the table on the next page

5. Make a note on MAP 1 p5 of where you did the measurement & note which groyne number.

Wave Direction

Updrift Downdrift

Height of Exposed Groyne

Diagram C

Diagram B

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Distance from sea

Exposed height of groyne UPDRIFT (cm)

Exposed height of groyne DOWNDRIFT (cm)

0m

3m

6m

9m

12m

15m

18m

21m

24m

27m

30m 26Gro

yne

loca

tion

/ nu

mbe

r:

Pebble measurement:

• The simplest way to measure pebble shape is to classify the stone as a SHAPE:very angular, angular, sub-angular, sub-rounded, rounded or very rounded

1. Decide which shape is the best fit for each pebble. Use the grid & codes below.

2. For an estimate of pebble size, measure the longest point (A axis) of each pebble.

3. You should aim for at least 25 pebble measurements from a site

4. Make a note on MAP 1 p5 of where you did the sample.

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Very Angular

VR

Angular

A

Sub Angular

SA

Sub Rounded

SR

Rounded

R

Very Rounded

VR

Pebble shape code/ longest axis (cm)

Pebble shape code/ longest axis (cm

e.g. VR / 6

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Pebble shape code/ longest axis (cm)

Pebble shape code/ longest axis (cm

Location of sample:e.g. between which groynes, updrift/downdrift/centre beach