HOMEWORK ASSIGNMENT 6

Telephone: 492-8830

ENERGY BALANCE AND SNOWMELT RUNOFF CALCULATIONS

- 40 possible points.
- SHOW ALL YOUR WORK.
- WRITE THE QUESTION AT THE START OF EACH ANSWER.

Section | Lab | Assigned | Due |

012,013 | Tuesday | Tuesday, Oct 16 | Friday, Oct 19 |

011 | Thursday | Thursday, Oct 18 | Monday, Oct 22 |

The timing and magnitude of snowmelt runoff is a direct function of the energy balance of the snowpack.

The objective here is to understand the relative contributions that different energy fluxes contribute to snowmelt runoff.

- Calculate the cold content of a snowpack given these conditions (5 points):
- average snow temperature of -5 degrees C;
- snow depth of 2 m; and
- average snow density of 300 kg/m
^{3}.

- Calculate the amount of heat added to a snowpack at 0 degrees C from 3.5 cm of rainfall with a temperature of 1 degree C (5 points).
- Calculate the amount of water output that is produced
from snowmelt on a day when the total net energy input
is 150 cal/cm
^{2}(5 points). - Answer the following questions about radiation, given (15 points):
- incoming solar radiation is 620 W/m
^{2}; - snow albedo is 0.92;
- snow temperature is -6 degrees C;
- incoming longwave radiation is 10% of the longwave emission from the snowpack; and
- emissivity of snow is 0.97.

- net incoming shortwave radiation;
- longwave emission from the snowpack; and
- net radiation.

- incoming solar radiation is 620 W/m
- Calculate a) the amount of energy available for
snowmelt and b) the depth of water equivalent melted, given
these values measured every second for 10 hours (10 points):
- net shortwave radiation is 600 W/m
^{2}; - net longwave radiation is -310 W/m
^{2}; - heat energy from rain is 50 W/m
^{2}; - ground heat is 50 W/m
^{2}; - sensible heat is 470 W/m
^{2}; and - latent heat is -310 W/m
^{2}.

- net shortwave radiation is 600 W/m