Rivers Flashcards
Explain the land use conflict of logging, including solutions.
When forests are cut down, a visible scar is left on the landscape, spoiling its natural beauty. This also harms wildlife habitats and logging trucks can cause traffic congestion.
A ‘buffer zone’ of trees planted around the edges of forests screens them from view, and provides further habitat for displaced wildlife.
What is Attrition?
When material carried by the river collide, and as they bump, they become smaller and smoother.
What is a confluence?
The point where a tributary meets the river.
What are the 3 features in the middle course?
Meander, Ox-bow lake, Levee
Explain the formation of a meander
In the middle course, the land is flatter, so the river can flow side to side. This causes parts of the river to have faster water flow than others. Th river is fastest on the outside bend where the water is deepest, whereas the river is slowest on the inside bend where the water is shallower. On the outside bend, where the water is fastest, the river has lots of energy to erode, forming a river cliff. In the shallower parts of the river, where the water flows more slowly, the river has little energy and so deposits some material, forming a river beach. The river continues to erode sideways rather than vertically, and, over time this process of erosion and deposition widens the meander.
What is hydraulic action?
The sheer force of the river water forces itself into cracks in the rock, breaking off small pieces.
What are the 4 land use conflicts between Tourists and Farmers
Dogs off leads, Traffic congestion, Littering and Farm gates
What are the 2 land use conflicts between Tourists and Forestry?
Campfires and Logging
Describe the formation of a V-shaped valley
A river in the upper course flows downhill, eroding the landscape vertically, deepening the base of the river [hydraulic action and abrasion]
The sides of the valley are exposed to weathering. This loosens the rocks which fall into the river, making the sides steeper, and assisting with abrasion.
The river deepens quicker than it widens, creating a V-shaped valley where the river winds through ’interlocking spurs’
What is the discharge of a river?
The volume of water moving down a river.
What is the mouth of a river?
The point where the river discharges into the sea
Why are rivers suitable for tourism?
White water rafting takes place on the fast-flowing water on the upper course, making it suitable for adventure tourists, and the lower course is suitable for fishing.
Picnic sites and local historic attractions can also be found in the land around the river.
Tourists can stay at hotels, B&B’s, and campsites when visiting the area.
Describe the formation of a waterfall.
When a river flows over bands of hard and soft rock, the soft rock is less resistant and so gets eroded quicker. This differential erosion is done by abrasion/hydraulic action. This makes a ledge which the water flows down.
The hard rock is ‘undercut’ by the erosion of the soft rock, creating a plunge pool with overhanging hard rock.
The overhanging hard rock collapses due to gravity, assisting with abrasion, which deepens the plunge pool. This process repeats, causing the waterfall to retreat upstream.
What are the 4 methods of erosion?
Abrasion, Hydraulic Action, Attrition and Corrosion/Solution
What is a tributary?
Small rivers that join a larger river