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Copy of The Afon Glaslyn - River Factfile
Transcript of Copy of The Afon Glaslyn - River Factfile
Name : Afon Glaslyn
Location: Gwynedd, Snowdonia, north-west Wales, UK
Source location/source: Glaslyn (cirque lake on the flanks of Mt. Snowdon)
(Snowdonia is highlighted)
-There is heavy rainfall on mt. Snowdon (high altitude)
-causing weathering of rocks ;
a) physically (frost shattering) to give large boulders and sands
b)chemically (by acids) to give some sands but mainly clays because of acids in vegetation being leached downwards into rock.
The Source- Glaslyn & Llyn Llydaw
-River descending, passing Cwm Dyll (hanging valley).
-Mainly metamorphic slabs of rock giving turbulence of water.
+Transportation ; large boulder (mainly being bedload) is transported by some suspension and a little solution.
+Erosion; attrition, corrasion, hydraulic action and corrosion all happen at the upper course of the Afon Glaslyn.
Land forms; waterfalls, rapids, potholes, large boulders
As we go further down the main feature that makes this river stand out from the others come to life; lakes & deltas. These two land forms are usually seen nearer the lower course of the river, however on the Afon Glaslyn you can see that at the altitude of about 60m.
Llyn (lake) Gwynant
One of the reasons suggested in order to make sense of this phenomenon is that there once was a glacier the which, when starting to melt, started sliding and moving; in doing so eroding and creating the lakes and deltas.
small boulders, cobbles, pebbles, sand, clay
+Transportation; small amount and size bedload transported by much suspension and little solution. Erosion; attrition, corrasion, a little hydraulic action and corrosion goes on here.
Landform; rapids created.
Land forms; small meanders and flood plains form
+Deposition; creating/effecting pebbles, gravel, sand, and clay.
The Aberglaslyn Pass/ gorge has a lot of rapids and waterfalls, it is the last part of the upper course of the river, it has a slight slope and height but not so much. The reason for it being a gorge is that there are a lot of waterfalls which creates gorges.
+depostion; causing pebbles and gravel on outside of bends in more turbulent flow, sand on inside of bends = meanders.
Land forms; Flood plain, meanders, braiding
gorge, rapids, and potholes.
The Glaslyn Estuary is basically the end of the river. It has exposed sand and mud flats at low tide. It's tidal.
Glaslyn Estuary (Traeth Bach)
Land forms; extensive flood plains with large meanders, some braiding, pools, and riffles
bedload deposited as sand,
suspended load deposited as mud
Portmadog - END
BIG ANGULAR ROCKS
LOOKS AS IF IT IS FAST FLOWING BUT NOT...
NOT YET MUCH ERODED
MOVES ROCK DOWN COURSE...
CAN'T SEE MUCH
LOTS OF VEGETATION
There are a lot of camp sites and walks. The river is very short but eventful. It's high up lakes and beautiful scenery attract attention. It's also a great place to kayak or canoe because of it's rapids and it's mini waterfalls. People usually visit 'Aberglaslyn Pass', 'Llyn Gwynant', and 'Llyn Dinas'.