Instructions: Choose the phrase that best answers each question.
1. Examine Figure 1A (8-9 August) and Figure 1B (1-2 August). Which statement best describes the tidal levels (number of feet above MLLW and number of feet
below MLLW) in the two figures?
A. The lowest tidal level was on 8-9 August and the highest tidal level was on 1-2 August.
B. The highest tidal level was on 8-9 August and the lowest tidal level was on 1-2 August.
C. The highest and lowest tidal levels were both on 8-9 August.
D. The highest and lowest tidal levels were both on 1-2 August.
A. Golden Gate (entrance to the Bay from the ocean in the Central Bay block)
B. San Pablo Bay (north of the Central Bay block)
C. Suisun Bay (east of San Pablo Bay)
D. South SF Bay (south of the Central Bay block)
A. 0 feet
B. 2 feet
C. 4 feet
D. 6 feet
4. Examine Figure 3B. At 9:00 on August 5, the tide was rising and currents were moving water from the ocean into the Bay. Which statement best describes the variation in current speed within the Bay?
A. The currents move faster in deeper water.
B. The currents move faster in shallow water.
C. There is no correlation between depth and current speed.
A. the rising tide (flood current shown in Figure 3B).
B. the falling tide (ebb current shown on Figure 4B).
Instructions: Write short answers for the following questions. Answers will be graded credit / no credit. Results will be available several days after the exercise due date.
1. Examine Figures 1A and 1B. What is the maximum tidal range
(that is, the difference in elevation between the highest and
lowest tidal levels of the day) in Figure 1A?
[Note that when the elevation is below 0 you must add the elevation below 0 to the elevation above 0.] What is the maximum tidal range in Figure 1B?
3. Examine Figure 3B. Describe the direction and speed of the
current during the flooding part of the tidal cycle. How does
the direction and speed change as the current
flows progessively further into the Bay?
NOTE: if you cannot access the SFPORTS web site, go to the tidal charts in today's newspaper or to the first web site listed in the voyage credits, where you can get tidal information for any location.