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

fluvioglacial and glacial variations

Extracts from this document...

Introduction

a)Distinguish between the terms net accumulation and net ablation Net accumulation and net ablation together make up the glacial budget. Net accumulation occurs at higher altitudes and therefore lower temperatures, meaning less melting of ice and a larger build up of snow. This area is called the zone of net accumulation. In the winter snow builds up to become nev(, compacted deeply frozen ice which over time becomes part of the glacier, therefore making the glacier bigger Net ablation is essentially the melting of glacier ice, which takes place in the zone of net ablation. This may take place through meltwater running down fluvio-glacial rivers, the calving of icebergs on coastal glaciers, which is happening to the greenland glacier at the moment, and sublimation where the ice directly evaporates without going through the transitional water stage. The zone of net ablation is usually at lower altitudes where the temperature is higher. ...read more.

Middle

They occur when a glacier begins to retreat, meaning the velocity of the ice drops and so material begins to be dragged along rather than moving with the glacier. Drumlins are mounds of glacial moraine which the glacier deposits whilst it is still moving. The glacier shapes the moraine leaving a steep sloping stoss end and a steeper sloping leeward end. This leaves a hill which is similar in shape to an upturned spoon. Kames look like circular mounds which are missing the tapered end of a drumlin. They are 10-20m high and can be up to 50m long. They occur at the edge of ice sheets where the glacier has melted away to leave the kame. Kames are not usually found close to each other. Drumlins however are usually found in clusters or 'baskets of eggs'. They are found at the base of glacial valleys as they are usually formed by valley glaciers. ...read more.

Conclusion

Outwash plains and ground moraine are another two features which can be hard to distinguish between in the field. Both are similar since both are features often not recognisable to the untrained eye due to their scale. Outwash plains are usually many square kilometres in area. They are formed when streams of melt water from a glacier deposit the material they are carrying onto the ground on a flat area. This moraine and till builds up making the area very fertile. Outwash plains are found in the Svalbard area of Norway. Ground moraine is very similar but is formed by moraine deposited by ice sheets rather than melt water streams. Areas of ground moraine are usually made of till and also create fertile land which is now popular for farming. Ground moraine is deposited over regions of land, such as East Anglia. In the field outwash plains may have streams crossing them and are generally flat. Ground moraines however create a gently rolling topography and may have features such as drumlins on the surface. ?? ?? ?? ?? ...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. Changes in the Cairngorms

    There is also a swimming pool and sauna alongside a golf course. Loch Morlich is also used to its full capacity. Many water sports take place here, these include, jet skiing, canoeing, and water skiing. There is also a sandbank which people use and call a 'beach'.

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

    This is because there is friction where the water hits the bank on the outside of the bend. Therefore in a meandering river the energy requirements of pools and rivers are much more in balance than in a straight river.

  1. Free essay

    Movement of Ice Sheets during the last glacial advance in the UK

    This combined with any weathered rock collected in the Bergschrund will lead way to abrasion which will further deepen the hollow.

  2. To what extent are fluvio-glacial deposits and landforms distinctive?

    As well as the ice itself eroding the bedrock, the debris within the basal layer of the glacier also erodes. Evidence for this process includes the polished appearance and texture of the rock in post-glacial regions. These processes are dependent upon various factors.

  1. Geography Coursework How Does Farming Change Between Bredon Hill and Birlingham? ...

    Introduction My aim is to find out why farming changes between Bredon Hill and Birlingham. The order of my workings is: * Identify my aim's * Choose my hypothesis or a key question I want to test * Do some research into the area + topic + write up my

  2. Main features and landforms of glacial erosion.

    Plucking could occur because as the ice moved up the stoss slope there was a reduction in pressure, allowing liquid water to re-freeze and attach the ice to the underlying rocks.

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

    First though, is important to understand the wider fluvial processes within a river. These are, as already mentioned erosion and transportation, but also, not mentioned is deposition. These fluvial processes are all linked into one another, especially through factors like velocity and efficiency.

  2. Do the Characteristics of a river change downstream?

    This was also the case on the opposite bank. The metre ruler was held side on to the river flow so that the water was disturbed as little as possible warranting fair results. Diagram Logic Metres and centimetres are an obvious choice for this type of experiment as they are both metric units and enable me to create a clear cross-section of the river channel.

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