Chapter 1 Introduction
1. ... 5 River Processes . ... To investigate changes in channel form and river processes at different sites downstream on the River Conway. ... To identify landforms associated with river processes. ... To observe changes in the cross profile of the River Conway valley. ... 3 Background Information
The River Conway flows for approximately 60 kilometers from Lyn Conway on Mignonette Moor (Snowwoman National Park) to an estuary at Conway (Irish sea coast). The River Conway is described as a flashy river, this is because it responds quickly to inputs and outputs this makes it rise and fall quickly. Sheep rough grazing and hill farms are among the land uses around the River Conwy. ... 4 Data Collection
Data was to be collected from four sites along the River Conwy. ... At each site, each group chose a ten-metre stretch of river, measurements of width, depth, and velocity were taken from the halfway point of each groups stretch. ... 5 River Processes
To better understand this study on rivers, information on river development and processes is needed. ... Salation - this is when small particles (the size of a grain of sand) bounce along the river bed. ... Traction - this is when larger rocks or boulders are dragged along the river bed. ... Vertical Erosion - this deepens the valley as the force of the water grows, this type of erosion most commonly happens in the upper stages of a river when the gradient is steep. ... Lateral Erosion - this process widens the valley of a river as does weathering on the sides. ...
Erosion also forms river features such as meanders. ... 3 Deposition
Deposition is when a river dumps its load. ... Large material carried as bedload is deposited in the upper stages of a river. ...
In the upper stages of a river the load is normally large and tend to be angular, by the time these rocks reach the lower stages erosion will have reduced them in size and made them more rounded. ... 1 Nant-y-Brwyn (SH,792,449)
Nant-y-Brwyn is a tributary of the River Conwy, part of the upper reaches of the River Conwy. In the upper reaches of a river, the river is eroded vertically rather than laterally this causes a v-shaped valley. The interlocking spurs at Nant-y-Brwyn were formed when the river was young and twisted around obstacles or harder rocks such as slate or quartz on its downward path. ... At this altitude there is less sun so there is less evaporation, the lack of major vegetation causes less transpiration, as this tributary is up high it is colder so bacteria cannot work properly, this causes the River Conwy to be a flashy river as the peat is saturated any extra water runs of straight into the river.
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