Year 12 SL by Lisa Steciuk https://padlet.com/list4/4iqkuiqkce6szlvn Summarise your understanding of Manning's Bedload coefficient in a couple of sentences. en-us 2021-01-20 04:51:09 UTC 2021-01-20 04:59:53 UTC hello@padlet.com Roisin https://padlet.com/list4/4iqkuiqkce6szlvn/wish/1104161670 Manning's bed roughness coefficient is the amount of frictional resistance water experiences when passing over land. An increase in channel roughness leads to a decrease in efficiency and velocity because the water has to fight against more friction than usual. ]]> 2021-01-20 04:55:47 UTC https://padlet.com/list4/4iqkuiqkce6szlvn/wish/1104161670 Lyda https://padlet.com/list4/4iqkuiqkce6szlvn/wish/1104162071 - shows the relationship between channel roughness and velocity 
-channel roughness causes friction which decreases velocity of water 
- high value, high roughness
-measure of frictional resistance a river goes through when passing over land

]]> 2021-01-20 04:56:02 UTC https://padlet.com/list4/4iqkuiqkce6szlvn/wish/1104162071 Bobby https://padlet.com/list4/4iqkuiqkce6szlvn/wish/1104162264 Manning's bedload coefficient is affected by the shape of the channel, the hydraulic radius and the velocity. They are related in the formula (V=RS/N). It measures the roughness of material on the river bed and how if affects friction, with a less friction in a lower coefficient.]]> 2021-01-20 04:56:09 UTC https://padlet.com/list4/4iqkuiqkce6szlvn/wish/1104162264 Sean https://padlet.com/list4/4iqkuiqkce6szlvn/wish/1104162294 Manning's bed roughness coefficient refers to the amount of resistance to flow that the water encounters in a river channel. affected by and takes into account:
  • suspended load
  • Sediment grain size 
  • presence of bedrocks or boulders 
  • variations in channel width and depth.
increase in bed roughness decreases efficiency and velocity. bed roughness is higher upstream as opposed to downstream, as large, angular rocks are characteristic of the upper course of the river.
]]> 2021-01-20 04:56:10 UTC https://padlet.com/list4/4iqkuiqkce6szlvn/wish/1104162294 Nick https://padlet.com/list4/4iqkuiqkce6szlvn/wish/1104162914 Manning's bed roughness is calculated by the three factors affecting the velocity of the river.
1. Hydraulic radius
2. Channel slope
3. Boundary roughness

]]> 2021-01-20 04:56:33 UTC https://padlet.com/list4/4iqkuiqkce6szlvn/wish/1104162914 Plume Plume https://padlet.com/list4/4iqkuiqkce6szlvn/wish/1104163048 Manning's bed roughness coefficient shows the relationship between channel roughness and velocity. A high coefficient indicates a rough bed. When a river channel is more rough, this leads to increased resistance and therefore decreased velocity.]]> 2021-01-20 04:56:38 UTC https://padlet.com/list4/4iqkuiqkce6szlvn/wish/1104163048 Angela anbr22 https://padlet.com/list4/4iqkuiqkce6szlvn/wish/1104163109 - shows the factors that contribute into the velocity and the channels roughness
- higher velocity indicates that the river is more efficient

]]> 2021-01-20 04:56:40 UTC https://padlet.com/list4/4iqkuiqkce6szlvn/wish/1104163109 Sophia https://padlet.com/list4/4iqkuiqkce6szlvn/wish/1104163912
  • One roughness coefficient is Manning's n-value. 
  • Manning’s n to predict the degree of roughness in channels. 
  • Flow velocity is strongly dependent on the resistance to flow. 
  • An increase in this n value will cause a decrease in the velocity of water flowing across a surface.
  • Factors like suspended load, sediment grain size, presence of bedrock or boulders in the stream channel, variations in channel width and depth, and overall sinuosity of the stream channel can all affect Manning’s n value.

    • ]]>     2021-01-20 04:57:08 UTC https://padlet.com/list4/4iqkuiqkce6szlvn/wish/1104163912     tea https://padlet.com/list4/4iqkuiqkce6szlvn/wish/1104164147 manning's bed load coefficient is a measure of how the roughness of the bed of a river bank affects the velocity of the water. 
    it is calculated wit the equation: Velocity = hydraulic radius x gradient / roughness (n)

    ]]>     2021-01-20 04:57:16 UTC https://padlet.com/list4/4iqkuiqkce6szlvn/wish/1104164147     Vidip https://padlet.com/list4/4iqkuiqkce6szlvn/wish/1104165167 Hydraulic roughness is a measure of the amount of frictional resistance water experiences when passing over land and channel features. This is important in producing a prediction of the flow velocity of the river. The grater the hydraulic roughness, the lower the velocity of the river. The factors of bed roughness include:
     - suspended load
     - sediment grain size

    ]]>     2021-01-20 04:57:52 UTC https://padlet.com/list4/4iqkuiqkce6szlvn/wish/1104165167