Page 203 - Soil and water contamination, 2nd edition

190 Soil and Water Contamination

a. Calculate the response time of this lake system
b. Calculate the mass of nitrate in the lake system
c. Calculate the residence time of nitrate in the lake system

5. Describe the main difference between point and diffuse sources and their impact on
regional surface water quality.
6. Describe the differences between physical and empirical models and the differences
between lumped and distributed models.

7. Why does a static model not require initial conditions?
8. Give an adequate number of spatial dimensions for modelling soil quality for the
following cases:
a. Leaching of phosphorus into the soil profile
b. Spatial distribution of radiocaesium in a hilly catchment
c. Uptake of pesticides by soil organisms in a field
Explain your answers.

10/1/2013 6:44:42 PM
Soil and Water.indd 202
Soil and Water.indd 202 10/1/2013 6:44:42 PM