Unit 1 - Essays - Physical Question Flashcards
With the aid of examples, discuss the view that velocity is the most important influence on sediment deposition in a river.
With the aid of examples, discuss the view that velocity is the most important influence on sediment deposition in a river.
Point: Velocity is a primary factor controlling deposition as shown in the Hjulström curve.
Point: Sediment size and load influence whether deposition occurs, even if velocity allows it.
Point: Channel morphology and turbulence can override the effect of velocity.
Point: Chemical composition of water and seasonal factors also affect deposition.
With the aid of examples, discuss the view that sediment size is the most important influence on deposition in a river.
With the aid of examples, discuss the view that sediment size is the most important influence on deposition in a river.
Point: Sediment size is undeniably important in determining where and when deposition occurs, particularly in relation to particle weight and cohesion.
Point: Velocity is arguably more important than sediment size, as it directly determines the river’s capacity to transport or deposit materials of any size.
Point: Other environmental and physical factors such as gradient, channel shape, and seasonal variation shape deposition patterns significantly.
Point: Human activity and climate change increasingly shape deposition through dam construction, deforestation, and altered discharge patterns.
‘The processes and landforms of a braided channel and of a meandering channel are different.’ With the aid of examples, how far do you agree?
‘The processes and landforms of a braided channel and of a meandering channel are different.’ With the aid of examples, how far do you agree?
Point: Braided channels exhibit unique deposition-dominated processes linked to fluctuating discharge and coarse sediment.
Point: Meandering channels are shaped by lateral erosion and helicoidal flow, forming distinct landforms like point bars and river cliffs.
Point: Spatial variation in both rivers reinforces the distinction between braided and meandering characteristics.
Point: Temporal variation adds another dimension, affecting processes differently in braided vs meandering rivers.
