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{{short description|A geographical model, which describes how a river's characteristics vary between the upper course and lower course}} {{short description|A geographical model, which describes how a river's characteristics vary between the upper course and lower course}}
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{{Underlinked|date=February 2017}} {{Underlinked|date=February 2017}}
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The '''Bradshaw Model''' is a ] model which describes how a river's characteristics vary between the '']'' and '']'' of a river. It shows how ], occupied channel width, channel depth, and average load quantity increase downstream,<ref>{{Cite web|url=https://www.geography-fieldwork.org/rivers/river-variables.aspx|title=Models of downstream change|website=Geography Fieldwork|publisher=]|archive-url=https://web.archive.org/web/20160513161314/https://www.geography-fieldwork.org/rivers/river-variables.aspx|archive-date=May 13, 2016|url-status=}}</ref> and other properties such as load particle size, ] roughness, and gradient as characteristics that decrease. These features are represented by triangles; an increase in the size of a triangle represents an increase in the variable. Generally the Bradshaw model shows the characteristics expected to be present in a river, but due to the nature of rivers and the ever-changing environment in which they exist, not all rivers assimilate to the model. Therefore, the model is often applied to compare natural rivers against ideal rivers that fit the model perfectly.<ref>earthstudies.co.uk</ref> The '''Bradshaw Model''' is a ] model which describes how a river's characteristics vary between the '']'' and '']'' of a river. It shows how ], occupied channel width, channel depth, and average load quantity increase downstream,<ref>{{Cite web|url=https://www.geography-fieldwork.org/rivers/river-variables.aspx|title=Models of downstream change|website=Geography Fieldwork|publisher=]|archive-url=https://web.archive.org/web/20160513161314/https://www.geography-fieldwork.org/rivers/river-variables.aspx|archive-date=May 13, 2016|url-status=}}</ref> and other properties such as load particle size, ] roughness, and gradient as characteristics that decrease. These features are represented by triangles; an increase in the size of a triangle represents an increase in the variable. Generally the Bradshaw model shows the characteristics expected to be present in a river, but due to the nature of rivers and the ever-changing environment in which they exist, not all rivers assimilate to the model. Therefore, the model is often applied to compare natural rivers against ideal rivers that fit the model perfectly.<ref>earthstudies.co.uk</ref>

Revision as of 06:29, 27 October 2019

A geographical model, which describes how a river's characteristics vary between the upper course and lower course
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The Bradshaw Model is a geographical model which describes how a river's characteristics vary between the upper course and lower course of a river. It shows how discharge, occupied channel width, channel depth, and average load quantity increase downstream, and other properties such as load particle size, channel bed roughness, and gradient as characteristics that decrease. These features are represented by triangles; an increase in the size of a triangle represents an increase in the variable. Generally the Bradshaw model shows the characteristics expected to be present in a river, but due to the nature of rivers and the ever-changing environment in which they exist, not all rivers assimilate to the model. Therefore, the model is often applied to compare natural rivers against ideal rivers that fit the model perfectly.

References

  1. "Models of downstream change". Geography Fieldwork. Field Studies Council. Archived from the original on May 13, 2016.
  2. earthstudies.co.uk
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