Question

EXERCISE 46 PROBLEMS-PART I The following questions are based on the portion of the "Kane Spring NW, California" quadrangle (scale 1:24,000; contour interval 10 feet) shown in Figure 46-6. These isolated dunes in the desert near the Salton Sea (33°11'02"N, 115°52'20"W) are moving overa surface that is only thinly covered with sand. To view this map in color, go to the Lab Manual website or scan the QR code for this exercise. 1. (a) What kind of sand dune appears to be most common in this dune field? (b) How do you know? feet 2. What is the height (the relief) of the tallest dune? feet What is the maximum width (or length) of the largest dune? 3. 4. (a) From which direction does the prevailing wind blow? (The top of the map is north.) From the How can you tell? (b) If the prevailing wind direction remains the same, with time, in which direction will (c) these dunes move? From to Find the large dune just south of "24" in Section 24. Assume that this dune is moving at an average rate of 90 feet (27 meters) per year. Calculate how long will it take for this dune to migrate out of the area shown on this map (a graphic map scale is found inside the fron cover of the Lab Manual). feet (or meters Distance to edge of map: (a) Time to move to edge of map: years (b) ci

Answer 1

1.a. North east and south east corner of this map having dunes and it is Barchan type of dune. 1. b. It is crescent shape landform with leeward side due to wind action. 2. 2 to 3 feet in height . 3. 700 m length 4. a. WIND BLOW FROM EAST TO WEST 4 b. The crescent shape structures were from east direction it's due to wind direction from West to East. 4 c. West to North West. 5 (last question a) section 24 is 1 cm away from border of the North West corner of this map hence the total distance is 2400 m from end of map according to scale hence this Barchan will shifted after 88 year . Therfore answer of last question a is 2400 meter and answer for b is 88 years.