• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

River Investigation

Extracts from this document...


Introduction Aims 1. To find out how channel characteristics such as width, depth, area, efficiency, gradient and bedload change downstream? 2. To find out how flow characteristics, such as velocity and discharge change downstream? Having studied rivers to a great extent at GCSE and A level I have decided to carry out a study on river processes and characteristics. I have chosen the River Brett as the location for my study due to its large drainage basin and varying stream orders, enabling me to carry out a wide ranging investigation. The River Brett is a tributary off the river Stour in Suffolk. The river Brett's total length is 100 km. Hypotheses In this investigation I am going to prove the following Hypotheses: 1) All of the river dimensions will increase downstream e.g. width, depth, area and radius. 2) All of the flow characteristics will increase downstream such as velocity and discharge due to a wider and deeper river. 3) Bedload size and shape will decrease downstream. Background and Theory of river processes 1. ...read more.


This is the slowest and least effective erosion process. Depositional Processes Deposition is where the velocity of a river looses its energy and is no longer able to carry it's load Material is deposited, starting with the largest particals. Deposition occurs when: * Discharge is reduced following a period of low precipitation. * Velocity is lessened on entering the sea or a lake * shallower water occurs on the inside of a meander * the load is suddenly increased (caused by an increase in farming or a landslide) * the river over flows its banks so that the velocity outside the channel is reduced ; resulting in a floodplain. Transportation Processes This is where excess energy is used to transport material down the river. As the velocity and turbulence increases, so does the ability to entrain materials. The load is transported by three main processes. * Bedload- This is where larger particals, which cannot be picked up by the current, are transported along the river bed. they are inturn transported in two ways: Saltation, where pebbles, sand and gravel are temporarily lifted up by the current and bounced along the bed in a hopping motion and Traction where cobbles and boulders are rolled along the bed. ...read more.


* Temperature- Extremes of temperature can restrict infiltration and so increase surface runoff. If evapotranspiration rates are high then there will be less water available to flow to the main river. * Land use- Urbanisation- Has an increased flood risk due to water being unable to infiltrate through the tarmac or concrete. Farming- Over cultivation of the land surronding a river may mean that tyhe soil is more easily eroded causing a build up of silt in the river and an increased risk of flooding. The loss of vegetation may also mean a higher flood rate as water will flow more easily through the soil. . * Vegetation- Large amounts of vegetation inhabiting the river, its banks and bed effects its velocity and therefore the amount of erosion. * Relief- A higher relief will mean that materials will flow faster down the river. * Geology How rivers work Precipitation ( River Basin Characteristics ( River Channel Characteristics -Relief, Shape, vegetation - Depth, width, velocity, relief, land use, Geology and soils, efficiency ( ( River Flow ( Energy Equation = 1/2 mv � ( Erosion River Processes ( Deposition ( Transportation ( ( River Load River Features - Oxbow lakes - Deltas - - - - - ...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

See related essaysSee related essays

Related AS and A Level Hydrology & Fluvial Geomorphology essays

  1. Hydrology and Fluvial geomorphology. (Q&A)

    whereas riffles are shallower sections with a less efficient channel shape (low hydraulic radius). This means that more energy is required to overcome the friction of the riffles than that of the pools, and in a straight river this means there is an energy imbalance between pools and riffles.

  2. An investigation into changes in channel parameters down the river Horner

    decrease in the gradient between the two sites and therefore the water is flowing more slowly. Discharge Decreased The river is discharging less water due to the decrease in velocity. Pebble size Decreased The pebble size has constantly been decreasing due to the factors explained above.

  1. My hypotheses are:The character of the course of the River Bollin will change along ...

    (Though the removal of trees at sight one indicated it was well managed) The final sight was completely different again, and the water was much deeper as it headed off to sea. Hypothesis 2 My final hypothesis was also proved correct, as the bed load became increasingly more rounded later on in the water course.

  2. Geography investigation - The River Skirfare located in the Littondale region in the Yorkshire ...

    Will hopefully support the dog biscuits data. Electronic equipment. Designed to measure the velocity of the river Could be done all across the river rather than just one location. This would give a better average velocity of the river. 'Dog Biscuits'.

  1. How does Loughton Brook change as it moves downstream?

    I believe that this is human error as they might have picked up pebbles that were on the ground than in the river. This of course would mean that they would be less eroded and maybe considered as anomalies. The erosion (Attrition)

  2. Investigating the river Caerfanell

    the surrounding acidic coniferous trees, � Hydraulic action the pure force of the river itself eroding the riverbed All these processes smoothen the riverbed and become more influential and dominant downstream due to the increase of discharge of the water from joining tributaries.

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

    Difficult in seeing the gauge under the water. 11/11/02 21 D90 bedload Ruler/tape measure To help to see if the River Lyn conforms to the Bradshaw model By counting 50 rocks then seeing the size of the 45th. Being random was difficult; preference could have affected the rocks chosen.

  2. Geograpgy glendun river

    The river may also erode away the bottom of the interlocking spurs causing a more flat land which looks more like a valley floor. Transporting materials and erosion should both be happening at this section of the river. The river erodes the outside bank of the river and undercuts it to form a river cliff.

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