You can use Google Earth to explore your own digital map of water depths like the one above. Just download a file at NOAA's NCEI Bathymetry [1] site and, once downloaded, select the ".kmz" file. Files are quite large, but very elucidating (try to find something near your house or favorite beach!).
Note the deepest value of nearly 53 meters in the estuary above. Why do the deeper channels tend to hug the east side of the estuary? Is this Coriolis?
In this portion of Lesson 5, we will examine one role of sea level rise in coastal evolution--that of the formation of estuaries. Of course, estuaries are an important feature of the coastal region because they provide water routes to inland regions for shipping, defense, etc., and because they are typically nurseries for the larvae and immature stages of many marine organisms as well as being important fisheries. In this course we will concentrate on the Chesapeake Bay estuary because of its proximity to most of the class and importance to the economy of the mid-Atlantic region. Those in University Park, PA have a direct connection to the Chesapeake because they live in the Susquehanna River watershed which ultimately dumps into the Chesapeake Bay. We'll begin here with a study of the formation of this estuary, and in subsequent lessons we will explore the ecosystem itself and the problems it faces now.
Click on the links below to access a scientific article on the origin of Chesapeake Bay. Read this paper and think about the evidence that these scientists use to reconstruct the early history of this estuary and the timing and impact of sea level changes. Note the importance of the 8.2 thousand year "event."
Let's outline some aspects of the work of a sedimentary geologist who is trying to reconstruct the timing and early history of an estuary. Answer the questions below to provide an overview of their approach and methods. Again, for some questions a short answer or list will suffice, but support your conclusion with further discussion if appropriate. Submit your ms word or pdf document as outlined below and drop into the Canvas dropbox for Lesson 5.
Save your document as either a Microsoft Word or PDF file in the following format:
L5_Activity2_AccessAccountID_LastName.doc (or .pages or .pdf)
For example, student Elvis Aaron Presley's file would be named "L5_Activity2_eap1_presley.doc".
See the grading rubric [3] for specifics on how this assignment will be graded.