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How valid is the concept of grade in a river's long profile
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- Words:
- 915
- Submitted:
- Fri Feb 02 2007
... How valid is the concept of grade in a river's long profile? A graded channel is a channel with an idealised smooth concave long profile: a steep youthful source declining into an elongated gentle elderly channel downstream toward its mouth. According to Collard 'As rivers evolve through time they appear to work towards the achievement of a smooth, concave profile ... from which irregularities are gradually removed.' G.K. Gilbert, an American geomorphologist first put forward the concept of grade believed that as a channel gradually wore away the land to give a flat peneplain resulting in the decline of the gradient downstream whilst upstream the channel continues to eat into the uplands consequently a graded-channel would eventually form. To this graded channel Gilbert devised the following classic definition; 'Where the load of a given degree of comminution is as great as the stream is capable of carrying, the entire energy of the
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