To do: print out pdf paper for lab F exercise - advent to geographical Tools - edge Lines and also Profiles
Materials needed: Buffalo Head enlarged topographic map section, Folsom, NM and also Glendale, AZ topographic maps (all top top reserve in ~ the GCC Library), and also a pencil.Part I. Characteristics of contour LinesTo do: finish all parts.Read page F-1 carefully as the text defines the rule of contour lines and also what the patterns have the right to tell you around the terrain.There are three species of edge lines that you will certainly encounter top top a topographic map.Contour lines (intermediate contours) - slim brown lines on the mapIndex contours - thick brown lines on the map with elevation worths on themHachure contours - thick or slim brown lines with tick marks pointing towards the inside. Hachured contours show "closed depressions".
You are watching: Hachured contour lines on a topographic map represent
Hachure contour lines
Looking end the six examples on web page F-2, let"s start by comparing the peak two images. Top left has carefully spaced contour and also the upper right has widely spaced contours. Spacing tells us about the slope. Offered that the two pictures are native a map the the very same scale, we have the right to state that whereby the contours space closer together, the slope is steeper. Closer spacing of border tells us that key is transforming faster over distance, in various other words, a steeper gradient.The pictures below present a nice example of contour spacing in relationship to slope. Because that example, an alert the spacing that the edge lines ~ above the level plateau in ~ the top. Vast spacing of border indicates flat terrain. As soon as you leave the level plateau and also start moving down the steep slope, an alert on the left image just how close with each other the contours are... Nearby contours show steep slopes. Also notice how the contour do the "V" notches pointing uphill wherein there are valleys. We"ll see this again later.
Figure F-3 reflects a hill top or peak. We view concentric contours through no hachure marks. Greatest elevation is somewhere within the the smallest contour at the facility where the arrow is pointing.Figure F-5 mirrors a close up door depression or feet as shown by the hachure contours. Towards the outside of the photo there room no hachures indicating that the terrain is increasing there, then when we start seeing hachures, we understand that we are now descending into a hole of part kind. This map section shows the sunken caldera of a volcano.Figure F-4 shows a valley and this one has an intermittent currently flowing with it. A sink is identified by the "V" shaped notch come the contours. Crucial rule to remember is that the notch always points UPHILL. If you remember that, friend will always be able to identify which means a flow is flowing with the valley. One more example is presented below.
Figure F-6 mirrors a saddle. A saddle is a low pass between higher peaks. The arrowhead is pointing come the saddle location. Another example is presented below. This chart (below) also shows the difference between a topographic see (view indigenous the top) and also a profile view (side view). You will be building a edge profile later in the lab.
Part II. Interpreting a edge MapTo do: finish all parts.
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The first part supplies the enlarged section showing Buffalo Head. This enlargement was made native the Folsom, NM map which you also have prior to you. For concerns 2-7, it is in careful regarding what they room asking for - some inquiries ask for elevation and some ask for the function type(e.g., hill, valley, etc).Question 10. Describe the ar of Buffalo Head utilizing the U.S. Windy Land survey system. Buffalo Head crosses two sections, so placed them both down.Switch to the Glendale map to answer the rest of the concerns on this web page (F-3).Part III. Creating a edge ProfileTo do: finish all parts.Page F-4 mirrors the procedure for constructing a profile. Girlfriend will have to do this again in rap N (week 14) for this reason make certain you understand just how to perform this. The an easy idea as shown in the illustrations in the practice is to take it a blank piece of paper and lied it under on the topo map along the transect you space to follow. In the exercise, you will construct the profile from letter "H" to "I" (page F-5).Every time your document crosses a contour line, do a mark on your document and compose down the key on your paper. When finished, take your document and lay it at the bottom of the graph paper, as displayed in the bottom figure on web page F-4. From her marks, walk up top top the graph file to the suitable elevation and also make a dot. Move all key points and connect with a line. Be sure to go right up from your marks so that you maintain the steep of the terrain, in various other words, don"t run to the nearest heat on the graph paper. You have to transfer the data specifically so you can see wherein the slope is steep vs. Gentle. Research the example in the lab hand-operated carefully and then execute your very own using the snapshot on F-5. The graph document is on page F-7. The map on web page F-6 is for you to use when you take your lab quiz this week. As soon as YOUR lab IS COMPLETE...Take quiz 13-F.