Based on the analysis of the topographic map, here is the step-by-step solution for drawing the topographic profile along the line A-A'.
Solution
To create a topographic profile, we must trace the line A-A' across the contour map and plot the corresponding elevation at each point onto the blank graph. The key to this process is understanding that the contour interval is 20 meters, meaning each contour line represents a 20-meter change in elevation.
Here is the path of the A-A' line and the elevations it encounters:
1.
Start at Point A: The line begins by crossing a contour line labeled "100". Therefore, the elevation at point A is
100 meters.
2.
Initial Ascent: Moving right from point A, the line crosses another contour line. Since we are moving away from the 100m contour towards higher ground, this next contour is
120 meters.
3.
Further Ascent: The line continues to climb, crossing subsequent contours at
140 meters,
160 meters, and
180 meters.
4.
Peak Elevation: The line then crosses the contour labeled "200", indicating an elevation of
200 meters.
5.
Descent into Depression: After the 200m contour, the line enters a depression area, marked by hachure lines. It crosses the next contour, which is
180 meters (a decrease from 200m).
6.
Continued Descent: The line continues to descend, crossing the
160 meter contour.
7.
End at Point A': Finally, the line reaches point A' after crossing the
140 meter contour.
How to Draw the Profile
1. On the blank graph, the vertical axis represents elevation (in meters) and the horizontal axis represents distance along the A-A' line.
2. Mark the starting point (A) at an elevation of 100 meters on the far left of the graph.
3. Move horizontally to the right and plot the next point at 120 meters.
4. Continue plotting points at 140m, 160m, 180m, and 200m, spacing them according to their relative positions along the A-A' line.
5. After the peak at 200m, plot the descending points at 180m, 160m, and finally 140m at point A'.
6. Connect all these plotted points with a smooth, continuous line. This line will show a gentle rise to a peak at 200m, followed by a steeper drop into the depression.
The resulting profile will be a curve that rises to a high point and then falls sharply, accurately reflecting the terrain's shape along the A-A' transect.
Parent Tip: Review the logic above to help your child master the concept of topographic profile worksheet.
