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Ishita Das posted an Question
November 11, 2020 • 12:49 pm 30 points
  • IIT JAM
  • Geology (GG)

. calculate the minimum velocity of stream required to entrain/erode the qrain of size 0.2mm? in cm/sec.

. Calculate the minimum velocity of stream required to entrain/Erode the qrain of size 0.2mm? in cm/sec. 1000- erosion 100 low speed cn/s) 10- transport epOs i 0.1 L01 001 100 0.1 10 1000

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  • Ishita das

    Also sir, the scales are not very clear in this picture, how did you get that it is 20?

  • Ishita das

    But sir it is written as entrain/ erode. So for entrainment which i guess means transport, the lower curve will be taken? am i right?

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    Sajan sarthak Best Answer

    Both X axes and Y axes are in logarithmic scale . And this is a famous Hjulstorm graph . here the upper concave graph is erosional curve. the below line is the depositional curve. If you take the x axes grain size of 0.2 mm just after the 0.1 line then it intersect the erosional curve at 20cm/sec. so Answer is 20cm/sec

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