• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4
5. 5
5
6. 6
6
7. 7
7
8. 8
8
9. 9
9
10. 10
10

# An Investigation of Channel and Stream Characteristics For Streams on the Isle of Arran

Extracts from this document...

Introduction

Middle

These enable one to compare easily and quickly the number of pebbles of each shape that were collected at each site. I found that this method enables me to clearly appreciate the number of pebbles of each different shape at each site separately but it was not so good when comparing the sites with one another. I then tried to use another graphical method to display this more clearly. I drew eight bar charts next to one another and found that by shading all the discs in one colour, all the rods in another, I was able to see clearly any trends in number over all eight sites. Athough this method was clear I thought that if I drew a line graph, one line for the number of discs at each site, another line for blades, and so on, it may be easier to spot the patterns. RESULTS OF THE VELOCITY OF THE RIVER AT EACH OF THE SITES Site one - 33.76 cm/s Site two - 15.58 cm/s Site three - 159.68 cm/s Site four - 74.08 cm/s Site five - 12.32 cm/s Site six - 31.68 cm/s Site seven - 12.92 cm/s Site eight - 20.25 cm/s RESULTS OF THE WIDTH OF THE RIVER AT EACH OF THE SITES Site one - 1.49m Site two - 4.6m Site three - 4.87m Site four - 5.90m Site five - 7m Site six - 7.6m Site seven - 7.2m Site eight - 8.6m RESULTS OF THE DEPTH OF THE RIVER AT EACH OF THE SITES Site one - 4.52 cm Site two - 12.25 cm Site three - 11.09 cm Site four - 21.73 cm Site five - 6.86 cm Site six - 2.55 cm Site seven - 11.73 cm Site eight - 17.55 cm RESULTS OF THE BEDLOAD SIZE (LENGTH OF B-AXIS) AT EACH OF THE SITES Site one - 10.60 cm Site two - 5.77 cm Site three - 20.59 cm Site four - 12.02 cm Site five - 16.82 cm Site ...read more.

Conclusion

This is quite possible although there is no reason why I should have been more biased at site four than at any of the other sites. Another possible explanation is that bed material is generally better sorted with distance downstream although tributary inflow can disrupt the picture. I have considered various explanations why site four did not follow the pattern of the others. Without further tests I am unable to give any definite reasons. Conclusion My first hypothesis was that as the river progressed downstream the bedload decreased in size. I proved that this hypothesis was in fact correct. I found that the average length of the b-axis decreased downstream.This meant that the pebbles became smaller. This showed clearly that the size of the pebbles decreased downstream. My second hypothesis was that bedload becomes rounder downstream. This was not really proved or disproved because it was found that discs and spheres which are both round shapes (compared with rods and blades which are long and thin) dominated the bedload for all eight sites and did not really increase or decrease dramatically at either end of the river. I found out that there was no relationship between the geology of the land and the results I collected. I also found that on this occasion the velocity of the river did not directly affect the size and shape of the bedload. Criticisms From other research investigated I would have expected my hypothesis to have been proved correct. This was not conclusive. Any number of the following could explain why this is so. * My hypothesis could have been wrong. * My methods or measurements may have been inaccurate. The measuring equipment may have led to inaccuracy. * We may have visited exceptional sites. In addition, I was unable to find sufficient explanations indicating why such results were obtained. I would have liked the opportunity to have returned to Isle of Arran to check these results which were out of line with the other, in particular site four. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Hydrology & Fluvial Geomorphology section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Related AS and A Level Hydrology & Fluvial Geomorphology essays

1. ## Hydrology and Fluvial geomorphology. (Q&amp;amp;A)

The steeper the rise in discharge to peak levels, the shorter the lag time. The reason that there is a delay between the input of precipitation and peak flow is that although some precipitation will fall directly into the channel, most falls elsewhere in the drainage basin system and takes time to reach the channel itself.

2. ## Study the downstream changes of Loughton Brook.

Channel Width The Channel width is measured by adding the water width and the bank to water widths on each side of the bank. A 1m ruler was required. Cross-sectional Area The cross-sectional area is useful in calculating discharge. It is obtained by multiplying the water depth with the water width.

1. ## How does the Efficiency and Cross-Sectional Area of a River Change Down Stream?

Difference squared (d�) 1 15.39 12 0.850276243 10 2 4 2 30.03 11 0.632210526 12 -1 1 3 31.62 10 0.81285347 11 -1 1 4 105.06 5 2.269114471 7 -2 4 5 86.9 8 2.342318059 6 2 4 6 80.73 9 1.782119205 9 0 0 7 110.05 4 2.888451444 3 1 1 8

2. ## I am going to study the characteristics of rivers and how they change as ...

Therefore, there will be less friction because less water is in contact with the bed and the banks. The Gradient affects the velocity in a different manner. The pebble size will decrease as stream order changes because the speed of the river is high, so the pebbles on the riverbed hit against each other, and so they break down.

1. ## 'To what extent does the River Lyn conform to the Bradshaw model of River ...

I did the statistic test to measure the strength of the relationship. The result was 0.7. There were some problems that occurred when trying to work out the Spearman's Rank Correlation Coefficient, including only taking five sets of readings from the River Lyn, and to get a more accurate Spearman's

2. ## This project will study about the way the river Conwy in north Wales changes ...

This might be a poor sampling and not measuring on both axis. Hydraulic radius: I have found that hydraulic radius increases when it travels downstream. It is increased from 0.18m to 0.35m from site 1 to site3.it has a relationship between wetted perimeter and cross sectional area measures of efficiency

1. ## Investigate change in river characteristics down stream.

It is based near a housing area. Site three, is Alluvium but site one and two were both London clay. Alluvium is a very fertile type of soil left behind on flood plains. This is evidence that site three may actually be located on a flood plain.

2. ## The river Gwaun: Investigating how the course of the river changes from the source ...

There was one anomalous result, which was 50cm from Site 2. There were no samples under 6cm, which is quite odd because there should be lots of small pebbles in the lower sites but because Site 4 in particular had large rocks added to the riverbed to stop erosion, I did not find any.

• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to