explain the development of a braided stream channel.What is the difference between braided stream channel and anastomising stream channel?
Channel pattern mean
the configuration of a river as it would appear from an airplane 3 patterns have been identified,one of which is the braided channel pattern.
A braided channel or
stream is one characterized by a network of interconnected converging and
diverging channels resembling the stands of a bread.The whole river system is
generally shallow,so that intervening single bars and alluvial materials are
exposed at low waters.It is mainly due to non-coherence of load,which leads to
selective deposition and the alluvial material is exposed at low waters.
The development of
braiding stream is a type of adjustment that a channel makes due to possession
of debris load too large to be carried by a single channel.the development of
this channel pattern requires steep slopes which contribute to sediment
transport and bank erosion and are associated with heterogeneous coarse
material.Coarser materials give increasing erosional attack on the bank.Large
braided due to compulsion has characteristic wide channels,rapid bed shifting
and changing river course.Example:-Kosi river.Turbulent fluctuations,subject
to brief decrease in density causes deposition and concentration of particles.A locus of the large deposited particles
develop subsequently.
Even with fine suspended materials irregular deposition
and bank erosion produce braided pattern.If the banks are erodible and channel
width confined,the capacity of the reach to transport the sediment would be
increased reducing the likelihood of deposition. Heterogeneity of the bed
material contribute to braiding.
A braided stream divide into
several channels which successively meet and divide while anstomising stream
divide and rejoin but do not redivide like the braided pattern of stream.
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