SNOW HYDROLOGY (GEOG 4321): HOMEWORK ASSIGNMENT 6
Instuctor: Mark Williams
Telephone: 492-8830
TA: Qinghuan Zhang
Email: qinghuan.zhang@colorado.edu
Homework 6
Assigned February 24.
This assignment will be due Monday, February 29, to be turned into by 5 pm.
Late assignments will be penalized 5% per day. No work will be
accepted after 11am on Wednesday
40 possible points.
Please box all your quantitative answers.
Please show all your work! Answers without work will only receive
partial credit.
- Calculate net radiation, given (10 points):
- Incoming direct visible is 500 W/m2
- Incoming diffuse is 150 W/m2
- Albedo of incoming direct is 0.90
- Albedo of incoming diffuse is 0.50
- Emissivity of snow is 0.97
- Emissivity of the atmosphere is 0.90
- Snow surface temperature is -10 deg C
- Air temperature is -20 deg C
- Viewfactor is 0
- Calculate sensible heat flux (H) using the simularity hypothesis
and the aerodynamic profile method, with data from these two
measurement heights (10 points):
- U 2 = 4.0 m/s
- U 1 = 2.0 m/s
- T 2 = 4.0 deg C
- T 1 = 0.0 deg C
- Z 2 = 2.0 m
- Z 1 = 1.5 m
- k = 0.4
- Calculate latent heat flux (LE) using the simularity hypothesis
and the aerodynamic profile method, with data from these two
measurement heights (5 points):
- U 2 = 4.0 m/s
- U 1 = 2.0 m/s
- q 2 = 0.001
- q 1 = 0.004
- Z 2 = 2.0 m
- Z 1 = 1.5 m
- k = 0.4
- Calculate the "cold content" of the snowpack, in J/m2, using the
following information. The cold content of the snowpack is the amount
of energy needed to bring the snowpack to an average temperature of 0
deg C (5 points).
- density of snow = 340 kg/m3
- Tsnow = -5 deg C
- Snow Depth = 1 m
- Calculate the heat advected by rain, in kJ/m2-day and W/m2.
Assume the snowpack is at zero degrees C and the rain does not freeze.
(5 points).
- Temperature of the rain is +1 degree C.
- 30 mm/day of rain.
- Calculate the heat advected by rain, in kJ/m2-day and W/m2.
Assume the snowpack is below zero and the rain freezes. (5 points).
- Temperature of the rain is 0 degree C.
- 30 mm/day of rain.