Transcript Contact Information and Office Hours

Contact Information and Office Hours
• Doug Kane
- [email protected]
• Joe Conroy
- [email protected]
Office Hours:
Office Hours:
W 12:30- 1:18- MBD 1527 M 10:00-11:00- MBD 1527
or by appointment
or by appointment
Prepared by Doug Kane
Morphometry and Graphical
Representation of Limnological
Data
• Goals:
1. Learn to draw a morphometric map of a lake
2. Determine a number of parameters of the lake (i.e.
volume, development of shoreline etc.
3. Calculate changes in total heat and oxygen content
in a lake
4. Prepare an isopleth diagram showing the variation
of temperature with depth and time for a lake
But wait……
• Why do I need to do all this?
• Don’t GIS programs do this nowadays?
• How is doing this going to help me learn
anything?
Reasons for doing this lab
• Throughout Wetzel and the course there are
isopleth diagrams, references to heat and
oxygen budgets, and references to different
morophometric parameters of lakes
• Lab II
• 5% of your grade
Materials
•
•
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•
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Outline of Hypo Lake with bathymeter data (P. 86)
2 Blank outline maps of Hypo Lake (Pp. 90-91)
Morphometric map of Hall Lake (P. 92)
Morphometric constants handout (P. 93)
Temperature and Oxygen values in Hall Lake
(1971-1972) (P. 94)
• Handout on integration (P. 95)
Point Breakdown (100 pts total)
• 20- Morphometric map- 6 m contours, only 6m done precisely
• 10- Table with surface area, and area for successive contours for Hall
Lake
• 10- Table showing volume of successive strata for Hall Lake
• 5- Table showing mean depth, length of shoreline, development of
shoreline, and development of volume for Hall Lake
• 30- Isopleth diagram for Hall Lake temperature using 5 degree
intervals
• 10- Calculation of seasonal temperature budgets for Hall Lake
• 10- Calculation of hypolimnetic oxygen consumption between 18
March and 30 April and 30 April and 4 June 1972
• Calculation of the relative volumes of the hypolimnion and epilimnion
for July 20
What to turn in:
• Data sheets for Lab 1(pp. 87-89)- completed
• Morphometric map of Hypo Lake
• At least one sample calculation for each
different type of calculation
Morphometric Map
• Connect points of equal depth
• Precisely for 6 m contour, approximations for
others
• Interpolation example: Have a 6.9 m and a 4.0 m
point, where does the 6 m contour go?
• 6.9-4.0= 2.9, 6.0-4.0= 2.0
• 2.0/2.9= 0.6897
• Measure the actual distance (cm) between 4.0 m
and 6.9 m, then multiply by 0.6897 to find out
how far (cm) the 6 m contour is from 4.0 m point
Lake 226
Calculations of areas,
circumferences, volumes
• Areas- use planimeter
• Circumferences- use map reader
• Need to calibrate using square with 50 m on
a side (2500 m2 )
• V= ((Am + An)/2) (n – m)
n deeper than m
Isopleths of temperature
• Y axis- depth, x- axis time, temperature is a
contour on the depth*time plane
Isopleths of temperature (cont’d)
• 1st prepare temperature profiles (Type I) for each
of the 10 dates given- Y- depth, X- temperature
• 2nd prepare depth (0-16, 0 at the top) vs. Julian
date (400 days long)
• Pick out depths at which given temperature
occurs, e.g. 5.0 degrees occurs at 7.5 m on 30
April
• Graph 5, 10, 15, and 20 ºC contours
Isopleths of temperature (Hints)
• Do isopleth diagram in pencil!
• Interpolate as before (see P. 85)
• Contours can never cross
Heat Budget
• Subtract temperature in lake on the coldest
day (27- Dec-71) from temperature on the
hottest day (5- Sep-72)
Heat Budget
Stratum
Area of
Stratum
# of
squares (m ºC)
Average
temperature
of stratum
(ºC)
Volume
of
Stratum
(m3)
Heat
in
Stratum
(ºCm3)
Heat Budget (cont’d)
•
•
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•
Want to convert m3 to cm3
Note: 1 ºC cm3 = 1 cal
Add in heat to melt 1 cm of ice
Final Heat Budget: cal/ surface area (cm2)/ season
Hint: draw hottest and coldest days on the same
graph paper and then you just have to count the
squares between the dates for each stratum
Hypolimnetic Oxygen Depletion
• What the heck is a hypolimnion?
Hypolimnetic Oxygen Depletion
• Hint: Graph the depth vs. oxygen graphs for
18- March, 30- April, and 4- June all on one
page. Then count squares in between dates.
• Hint: convert m3 to L
• Hint: final answer in mg/ cm2 / month
Relative volumes of hypolimnion
and epilimnion
• Delineate hypolimnion and epilimnion
using a ruler
• Don’t forget that there is a metalimnion
between the two
• Hypolimnion/ epilimnion
Final Four Hints
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•
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•
Keep track of units!
Keep track of units!
Keep track of units!
Keep track of units!
Measured Area Measured Distance Stratum
191303
1684.126117
16
354190
2394.299782
15.5
148227
1544.284271
Calibration
480985
2669.596247
15
607559
3007.787156
14
757557
3335.593288
12
878857
3568.772004
10
151321
1556.970563
Calibration
992443
3797.139536
8
1104923
3985.673591
6
1240237
4248.911181
4
1430240
4583.337588
2
1728576
5392.687009
0
150543
1551.313708
Calibration
Area
3187.739
5901.974
2469.951
8014.798
10123.938
12623.400
14644.658
2521.507
16537.376
18411.664
20666.442
23832.519
28803.782
2508.543
Distance
217.187
308.771
199.152
344.274
387.887
430.161
460.232
200.788
489.683
513.996
547.944
591.072
695.446
200.059