New Mills Geography

New Mills Geography

Bradshaw Model Upstream Downstream Discharge Occupied channel width Channel depth

Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient) Upstream Downstream

Discharge Occupied channel width Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)

Discharge The volume of water that passes through a crosssection per unit of time. Cubic metres per second. Increases due to the input from a

greater amount of the river basin above that point. Upstream Downstream Discharge Occupied channel width

Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient) Occupied Channel Width

Distance across the actual channel, measured at the water surface. Increases due to increase in discharge, input from tributaries etc.

Upstream Downstream Discharge Occupied channel width Channel depth Average velocity Load quantity

Load particle size Channel bed roughness Slope angle (gradient) Channel Depth The height from the water surface to the stream bed. Increase downstream as

does the size of the river. Line connecting places of greatest depth is called the thalweg. Upstream Downstream

Discharge Occupied channel width Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)

Average Velocity Is the speed of water flow (distance travelled per unit of time). Steady increase downstream. How can it be so if the gradient is

deceasing? (imagine 2 slides one steep, one less so). Downstream the river becomes more efficient with proportionally less contact with its bed and banks. Shown by higher Hydraulic Radius and lower Channel Bed Roughness.

Upstream Downstream Discharge Occupied channel width Channel depth Average velocity Load quantity

Load particle size Channel bed roughness Slope angle (gradient) Load Quantity Capacity of the river. Total load of all sizes. Increases with

discharge and velocity. Upstream Downstream Discharge Occupied channel width Channel depth

Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient) Load Particle Size Decreases considerably

downstream. Angular pebbles become more rounded. Attrition. Upstream Downstream Discharge

Occupied channel width Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)

Channel Bed Roughness Decreases because of fewer stones etc, small load particle size etc. Upstream Downstream

Discharge Occupied channel width Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)

Slope Angle Decreases.

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