CTIVITY 15.2 Introduction to Shorelines me: Course/Section Date: Refer to the Sp
ID: 121197 • Letter: C
Question
CTIVITY 15.2 Introduction to Shorelines me: Course/Section Date: Refer to the Space Shuttle photograph of the Po Delca, ltaly (FIGURE 15.4). The city of Adria, on the Po River in Nothern Italy, was a thriving seaport during Earuscan times (600 B.C.). Adria had such fame as to give its name to the Adriatic Sea, the Po River flows. Over the years, the Po River has deposited sediment at its mouth in the Po Delta Becaue rn shorline is far of the Po downstream from Adria. ta's progradation, Adria is no longer located on the shoreline of the Adriatic Sea. The mode 1. What has been the average t has been the average annual tate of to Delta progradation in centimcters per year (cmlyr) since Adria was a thriving seaport on the coastline of the Adriatic Sea? (Show your work.) 2. Based on the average annual rate calculated above (Al), how many centimeters would the Po Delta prograde during the lifetime of somcone who lived to be 60 years old? (Show your work.) 3. REFLECT & DISCUSS Sea level is rising and submerging coasdlines adjacent to the Po Delta. Why do you think the delta is prograding out into the Adriatic Sea photographs of Saint Catherines Island, Georgia (FIGURE 15.5). Note that on the southwestern and B. Refer to the map and raarts of the island there are large areas of salt marsh. Living salt marsh plants are present there, as shown on the GURES 15.SA and B. Also, note the linear sandy beach in FIGURES 15.SA and B, bounded on its seaward side right (west) in FiGusa marsh mud. However,all of the living,surficial saltmarsh plants and animals have been stripped from this area. is 1. What type of sediment is probably present beneath the beach sands in FIGu lioin b ancd This is lld rc maud (md emaining fiom an ancint sit manh). URES 15.SA and B?Explanation / Answer
Given the data, we can see that the distance between the tip of the delta and the city of Adria is 6 cms on the map, the scale of the map is 6cm= 40 kms, hence the delta has grown for 40 kms from the city.
Therefore the rate (the age difference is 600+2017= 2617 years)
40 kms= 4000000 cms (1km= 100000cms)
rate of growth is 4000000/ 2617= 1528.46 cms/yr
2. Given the lifetime is 60 yrs,
the total distance of the delta which moved seaward is 1528.46*60= 91708.06 cm
3. By the above calculation of the extension of the delta, the numbers are very large for a typical river. This implies that the sediment transport by the river Po is very large. Hence the sediment input is high compared to the sea level rise, hence the delta is building up new land and extending towards the sea.