Gradient

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Gradient for Topographic Maps

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Gradient

  1. 1. Gradient
  2. 2. Inquiry <ul><li>How do we measure and describe gradients on maps and in the field? </li></ul><ul><li>How does a map indicate gradients? </li></ul><ul><li>What is the relationship between gradient and land use? </li></ul>
  3. 3. Getting the right answer <ul><li>Gradient measures the steepness of a slope. </li></ul><ul><li>Step 1 : Measure the rise (difference in height between 2 points) </li></ul><ul><li>Step 2 : Measure the run (the distance between 2 points). Make sure that you convert the scale into metres </li></ul><ul><li>Both the rise and run need to be expressed in metres. </li></ul>
  4. 4. A worked example <ul><li>Say the rise is 42 metres and the run is 600 metres. </li></ul><ul><li>42(rise)/600(run) - Formula (divide the top by itself and the bottom by the top) </li></ul><ul><li>Divide 42 by itself = 1 </li></ul><ul><li>Divide 600 by 42 = 14.3 </li></ul>
  5. 5. Expressing the answer <ul><li>The answer can be expressed in three ways: </li></ul><ul><li>a) As a statement 1 in 14.3 </li></ul><ul><li>b) As a ratio 1: 14.3 </li></ul><ul><li>c) As a representative fraction 1/14.3 </li></ul>
  6. 6. What does the answer really mean? <ul><li>What does 1 in 14.3 mean? </li></ul><ul><li>It means for every 14.3 metres travelled along the ground between the two points you would go up one metre. This is a gentle or gradual slope. </li></ul>
  7. 7. Now think of some examples of how gradient relates to land use
  8. 8. How does the gradient of the slope contribute to the severity of bushfires?
  9. 9. Create a question on gradient and test another student <ul><li>Make sure you have the right answer before you test them </li></ul>

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