The aim of this field investigation was:
1. To investigate stream channel characteristic to see how they vary downstream.
* Does the stream get wider and deeper downstream?
* Does a rock sample vary downstream?
2. Examine the different erosional and depositional features of the river.
3. To investigate the impact of humans downstream.
On this field trip we went to Wag Water River. We use material such as rulers, stop watch, sketches and description of sites was made; method of observation was used to see how humans use the river for various reasons. Along the river channel group of student did the following at different points;
Velocity: we measure ...view middle of the document...
The chart above is comparing the rock sample from the three different sites. At each location rocks was took up base on the type of rock they are and was measure. Therefore the graph above show you how much rock was at each location that was measure and the data that’s was collected was compare together it at different sites. On the above there were more angular rocks at Golden spring because they haven’t gone throw the process of attrition some of the angular at Toms River and Broad Gates are eroded from the bank of the river or place there. Broad Gates seems to have more rounded rocks as it goes downstream the rock get rounded due to attrition, as the rocks goes down stream thy are thrown against each other . The diagram above shows that golden spring and Broad Gate have same amount of sub-rounded rocks.
Fig2 showing the velocity compared at the two sites.
A tributary is a stream or river that flows into a main stem river or a lake.
Velocity downstream increases when there are more streams feeding the main stream which Tom’s rive have. When the river has too many debris, the velocity is low therefore less energy. There was a tributary in the middle course at Toms River and the velocity was high, the load was transported faster because there was more energy. The velocity is greater in the lower course. In the upper course there is a lot of energy but it is used to overcome friction caused by obstacles in the river. The Velocity increases as a river becomes more efficient in its lower course or middle course due to the shape of the channel. The velocity depends on the volume and gradient of the slope. The river is deeper, wider and has higher discharge in its lower or middle course. Less water is in contact with the river, so friction from the bed and the banks is reduced. The river water is higher, increasing friction and reducing the friction of the river. Channel roughness is higher in the upper course than further downstream
Fig3 Show the Depth of the three rivers combined.
On the chart above Golden spring has the smallest width it is 19.5 meters (m) the river erodes the bed rapidly when the river cutting downwards into its bed, a process called vertical erosion. Also above on the chart Toms River the width is 20.9 meters (m) the river become less steep; lateral erosion becomes more important and the river starts have meanders. As river goes down it get wider and get deepens. Broad Gates the Wider of them all which is 51.8 meters (m) it consider the deepest and widest cause of the amount of water flowing within the river is at its greatest.
We arrived at Golden spring at 10:00am; the weather was sunny. There’s a lot of vegetation near this river like banana tree, coconut, breadfruit, ackee, bamboo (a lot) and some flora. Before arriving to the river we pass through a community centre with football field and Basic school across in front of it. The water is slow and steady cause of the land slide a lot of minerals in the water.