• 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
  11. 11
    11
  12. 12
    12
  13. 13
    13
  14. 14
    14
  15. 15
    15

Field investigation around the hypothesis: The River Piddles bed load will become smaller and rounder downstream.

Extracts from this document...

Introduction

Hypothesis: "The River Piddle's bed load will become smaller and rounder downstream." The aim of my study is to investigate the bed load of the River Piddle, in particular the size and texture of the rocks and gravel in the river. I will compose this from various different points along the river, from places near to the source going down to the mouth of the river. I aim to discover: 1. Does the size of the bed load change from upstream to downstream? 2. Does the calibre of the bed load change from upstream to downstream? 3. Does the velocity of the river affect the size of the bed load? 4. Does the cross sectional area affect the calibre of the bed load? 5. Does the cross sectional area affect the size of the bed load? The River Piddle (See fig 1.0) is a small rural river in Dorset. It is roughly 25.8km long, and runs from its source at Alton Pancras church to its mouth in Poole Harbour. I investigated at eight different sites along the river - Athelhampton, Affpuddle A, Affpuddle B, Throop A, Throop B, Warren Road, Wareham A and Wareham B (listed in order from source to mouth). I predict that as the river moves further from the source, the bed load will get smoother, as this has been proved in various other studies before, and has been illustrated in the Bradshaw Model (see fig 1.1). The Bradshaw model states that various factors of the river change as the river flows downstream. It shows that on average, the bed load of the river becomes less rough in relation to the distance downstream. This could be because the further the bed load travels, the more abrasion and erosion it is subjected to, and so it is far more likely to become smooth after a longer period in the river - meaning the bed load closer to the mouth of the river would almost certainly be smoother and more rounded than that found closer to the source. ...read more.

Middle

Water Depth Number cm m cm 0 0 1 53 0 -20 2 166 0 -28 3 159 0 -45 4 212 0 -50 5 265 0 -52 6 318 0 -52 7 361 0 -47 8 424 0 -42 9 477 0 -25 10 530 0 -20 0 Average -38.1 Cross-s-a 2.0193 Wetted P 6.062 H-R 0.333107885 Bed Load Number Size Shape length width A SA R SR 1 29 18.5 1 2 11 10 1 3 10.5 4.5 1 4 8 7.5 1 5 25 15 1 6 10 8 1 7 12.5 10.5 1 8 9 5 1 9 9 8 1 10 12 8 1 11 9.5 6 1 12 9.5 9 1 13 13 10 1 14 8.5 1 15 10 9 1 16 15 12 1 17 10 8 1 18 8 6 1 19 15 9.5 1 20 8 5 1 Average 12.125 8.525 6 5 5 3 Velocity Distance Reading Time 0(s Speed 1 26.6 0.37593985 2 31.6 0.316455696 3 36.2 0.276243094 4 28.5 0.350877193 5 26 0.384615385 Average 0.340826243 Discharge 0.688230433 Throop A: Width m Depth Distance from Bank Water Depth Number cm m cm 0 0 1 60 0 19 2 120 0 28.5 3 180 0 47 4 240 0 58 5 300 0 60 6 360 0 57 7 420 0 50.5 8 480 0 49 9 540 0 35 10 600 0 0 0 Average 40.4 Cross-s-a 2.424 Wetted P 6.808 H-R 0.356051704 Bed Load Number Size Shape length width A SA R SR 1 5 1.5 1 2 4 1 1 3 3.5 2 1 4 3 1.5 1 5 2 2 1 6 2.5 1 1 7 2.5 1.5 1 8 2 1 1 9 2.5 1 1 10 2 1 1 11 2 2 1 12 2 1.5 1 13 2 1 1 14 2 1 1 15 2.5 1.5 1 16 1.5 1 1 17 1.5 1 1 18 2 1 1 19 2.5 1 1 20 ...read more.

Conclusion

2. Does the calibre of the bed load change from upstream to downstream? From these results, it is possible to see that the bed load calibre does change greatly from source to mouth. The number of angular samples is highest at Athelhampton, the site closest to the mouth, and that number then decreases as they move further downstream towards the mouth of the river. The sub-angular samples peak closer to the mouth, at Warren Road and Wareham A, where before they were constantly quite low, not increasing past 30%. The sub-rounded and rounded samples gradually increase as they move closer to the mouth of the river. As the bed load usually found at the source of the river has not been subjected to much erosion, it is suggested on the Bradshaw Model that it will be more angular, and will become smoother and rounder as it moves towards the mouth of the river. This means the Bradshaw Model predicts that there are more angular samples at the source, and more rounded samples at the mouth. This has been roughly proved in my results, and so I come to the conclusion that the calibre of the bed load does change from upstream to downstream. 3. Does the velocity of the river affect the size of the bed load? When comparing the length of the bed load and the river velocity, it is possible to see a rough correlation between the two. The length and velocity remain relatively low until Throop B, where the length peaks at 6cm. The width does not have any correlation with the velocity however, as it peaks at Affpuddle B whereas the velocity peaks at Warren Road. From my results, it is possible to see a very slight correlation between the length and the velocity, but it is doubtful to see whether this is by chance or whether they have affected one another. My conclusion would be that the velocity of the river does not affect the size of the bed load. ?? ?? ?? ?? Edith MacLean ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Physical Geography 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

See related essaysSee related essays

Related GCSE Physical Geography essays

  1. Characteristics of a river

    Accept Gradient decreases downstream Results fluctuate however it remains true Results fluctuate due to human error. However in the end there is an increase between the first site and the ninth even though it is by a few degrees. accept Load particle size decreases downstream Completely opposite This is because

  2. To what extent Rothbury fits a model of tourist honeypot

    Although, a single day survey does not show me the bigger picture of impacts of tourism on Rothbury as we visited on a weekday and outside tourism season. There is a fair possibility that we came across more number of residents than visitors.

  1. Geography Field Study River Investigation Coursework

    What are the Key Geographical Concepts and Processes Underpinning the Investigation? Throughout much of this investigation I will be comparing my results to commonly accepted theories and textbook characteristics; - A commonly accepted theory that I will be using to check my results against is shown in the picture below,

  2. Geography river study coursework - Why do channel characteristics vary downstream at a number ...

    our way and so we could not get an exact reading of the width. Depth (average) 30 metre tape measure, ranging poles, one metre ruler At each site, a 1 metre ruler was used to measure the depth of the stream at 1m intervals along the width.

  1. how brent fits the burgess model

    When industries became bigger they were pushed away towards the low wealth zones. Also the Sub business district is not only airports but could also be universities (with bookshops, cafes nearby) or even business centres like Wembley. Aims of This Investigation In this coursework I hope my coursework answers a

  2. An Investigation Into Kingston Area Shopping Centres and Their Patterns of Use

    A Central Place is a settlement, which provides various goods and services for the population living around it. The order of a Central Place is defined by its function, such as the number, price, and variation of goods and services.

  1. Geography - Ivestigation of the River Colne, Buckinghamshire

    In addition, I have procured a 3D map of the area (next page), so I know that the immediate surroundings of the river are reasonably flat, and that the river's gradient decreases gradually over the 10km I have chosen to study.

  2. The Ashdown Forest - geography,land use and climate. River study field trip

    with Iron working during the Roman Period and Saxon Farming, however the forest took on its role as an area of enjoyment in the 11th century, when it was set up as a hunting ground for the Crown and used for Rabbit farming.

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