Module 4: Analysis of Historic Tide Levels (1915 to

2013) and Predictions through 2043.

Student Name: John Doe JamesSection 01: 10:00 to 11:00, Fall 2014

Geologic and Geographic Comparison of Selected Sites

City or Region & Country Date Range of Tide Records Geographic and Geologic Setting

Location 1: Victoria British Colombia, Canada

Pacific Coast of North America

Data from January 1910 to January 14, 2012;

Data is 91% complete.

British Columbia is located along an emergent coastline and in an active continental margin near the Juan de Fuca tectonic plate where it subducts beneath the North American Plate. British Columbia is also a formerly glaciated terrain that is experiencing some glacial rebound

Location 2: AAA

Location 3: BBB

Geologic Setting of Location 1: Victoria, British Columbia

Juan

de

Fuca

Pla

te

North American Plate

Subd

uctio

n Zo

ne

Pacific Plate

Analysis of Tide Hydrograph for Location 1: British Colombia,

Canada

Facts:• In this hydrograph, the highest tide levels on

record were in excess of 400 mm above mean sea level (4 meters).

• 3 of the 4 highest tides (circled) have been in the last 3 decades. These occurred in 83, 97, & 2009.

• The previous highest tide occurred in 1914.• The lowest tidal levels (1 meter below mean

sea-level) occurred in 1945, 1965, 1973, 1978. All of these are at least 4 decades old.

• Gaps existed from 1922-1940 which coincided with great depression in the U.S.

Inferences:• Cyclic sea-levels are observed on different

time scales – maybe tied to El Nino events that we already learned have impact the west coast on a decadal scale.

• The trend of all data points over the long-term is positive. Thus sea-level is rising at this site. The equation for the trendline is provided.

• Sea-levels on average have risen about 40-50 mm in 100 years despite the fact that this is a formerly glaciated coastline that is experiencing glacial rebound.

Insert Google Earth Screen Shot and Label at least 3 key geologic/geographic features

Geologic Setting of Location 2: AAA

Location 2:Facts:

Inferences:Hydrograph for Location 2 Here

Insert Google Earth Screen Shot and Label at least 3 key geologic/geographic features

Geologic Setting of Location 3: BBB

Location 3: Facts:

Inferences:Hydrograph for Location 3 Here

Composite Graph: Analysis of All Sites

Facts:• Which sites show positive sea-level change?• Which sites show negative sea-level change?• Similarities in the data

• How are the rates similar?

• Any differences in the data? • How do the geologic/geographic settings

compare?

Discussion and Conclusions:• What does your analysis of these three sites

indicate about sea-level change?• How do your selected sites compare to the sites

selected by your classmates? Any similarities? Dissimilarities?

Final Conclusions

Qualitative: describe what site 1 data saysdescribe what site 2 data saysdescribe what site 3 data saysdescribe what composite data says

Quantitative:E.G. Sea-level is projected to rise by XXX mm /year at Sites 1 and 2, but is projected to fall by XXX

mm/year at Site 3. By 2042, sea-levels are predicted given past trends to be at 300 mm above mean seal level, which is a rise of 115 mm from modern sea-level.

Acknowledgments / Data Sources / Citations