QUESTION 3 The action of a meandering river on the landscape is defined as Walth

Question

QUESTION 3 The action of a meandering river on the landscape is defined as Walther's Law: sediments near a meandering river transition vertically from bottom to top from coarser-grained sediments to silt and sand, and then to clay because the clay in the prodelta builds out over the silt of the delta plain tidal channels cut through barrier islands over time the channel never changes position Othe high energy channel migrates outward as it cuts across the landscape QUESTION 4 A braided stream can form in any climate and does so because there is enough water and it cleanly moves all sediment the stream or river gradient becomes less steep and the power of the river decreases sea level decreases flooding becomes more frequent

Explanation / Answer

QUESTION 4) A braided stream can form in any climate and does so because___________.

Ans. the stream or river gradient becomes less steep and the power of the river decreases.

A braided stream can form when the gradient becomes less steep. As a result the carrying capacity of the river decreases. The carrying capacity of a river is directly associated with the stream power. Stream is generally flows under the action of gravity, so, decrease in gradient means decrease of stream power. As a result, it becomes impossible to carry all the sediments present in the channel, and sediments are deposited within the channel, and there is the formation of a braided stream.

QUESTION 3 is answered by you. But I think the answer is the high energy channel migrates outward as it cuts across the landscape. Because the deposition here results from lateral migration of meandering river during flooding. Here the deposition pattern from bottom to top is: coarse grained sand of channel lag deposit at the bottom followed by fine graied sand to silt and silty and clayey layers of floodplain at the top.  

If the clay in the prodelta builds out over the silt of the delta plain, it becomes a finning upward sequence. But prodelta and delta plains are part of a deltaic sequence, and a deltaic sequece is characterised by coarsening up sequence.

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