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.