Measuring sea level change Measuring sea level change EXERCISE 14.5 Measuring Se

Question

Measuring sea level change Measuring sea level change EXERCISE 14.5 Measuring Sea-Level (and Lake-Level) Change Name Course: The Pacific Coast, California The map below shows details of the California coast not far from where Figure 14.11d was Date Portion of the Dos Pueblos Canyon quadrangle of California. 1 mile 0.5 1 km Santa Barbara Channel Contour interval = 20 feet (a) Describe the shoreline in your own words. (b) Sketch profiles along lines A-B and C-D on the graph paper provided at the end of this chapter. (c) What evidence shows that a change in sea level has taken place? (d) Based on the map and profile, is this an emergent or submergent shoreline? By how much has sea level changed? Explain your reasoning

Explanation / Answer

a) The shoreline shown in the figure is a typical combination between longshore drift type and rias type. In the first one The grains of sand and pebbles deposited on the coast do not settle there permanently; they are agitated by the waves, which push them onto the shore obliquely, and then sweep them perpendicularly in the ebb, before drawing them back to shore again at an angle. This zigzag shift, called longshore drift, sets a pattern in which the sediment is moved in a precise direction. In the second one fluvial valleys that are submerged following a rise in sea level or sinking land, forming a group of inlets cut into the coastline

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