B.4.3.3 Very Fine to Fine Sand-Bed Rivers
Comparison of Group 2 data between measured and computed concentrations by the
Laursen and modified Laursen equation are shown in Figure B.11 and Table B.14.
Figure B.11. Comparison of measured Cppm and computed Cppm using Laursen and
modified Laursen equation for very fine sand bed-rivers.
Table B.14. Discrepancy Ratio RD Between Cppm Computed and Cppm Measured for
Very Fine to Fine Sand-Bed Rivers.
Laursen
Modified Laursen
Discrepancy Ratio RD
0.36
1.01
B.4.3.4 Silt-Bed Rivers
Comparison of Group 2 data between measured and computed concentrations by the
modified Laursen equation are shown in Figure B.12 and Table B.15.
B.4.3.5 Channel Size
As stated in previous paragraphs, the analysis of sediment transport relations was based
upon channel size subdivided into small rivers, intermediate rivers, and large rivers. From
Figure B.7(b), the relationships between V*/ωi and f(V*/ωi) for these three channel sizes using
data from Group 1 follow the proposed modified Laursen graph. Validation for this
consistency is examined using data from Group 2 for three channel sizes. The relationships
between V*/ωi and f(V*/ωi) for data from Group 2 for these three channel sizes are plotted
with the Laursen graph in Figure B.13. From Figure B.13, it can be concluded that
consistency between V*/ωi and logf(V*/ωi) is good for several sizes of rivers based upon data
from Group 2. This figure also shows that for different sizes of bed sediment (from silt to
gravel) the proposed modified Laursen relation gives good results in comparison with other
accepted methods.
B.27
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