Modeling - Field Sampling: Principles and Practices in Environmental Analysis - page 198

8. What do A and T refer to in USLE and how are they related?
9. Explain how particles move through air, water, and soil. How is movement in soil
different from that in water and air?
10. Make a simple dynamic model for the fate of nitrate in the environment. (Hint: see
Figure 7.5.)
11. Make a complex dynamic model for the fate of nitrate in the environment. (Hint:
see Figure 7.5.)
12. Write a simple equation for the future level of potassium in a body of water.
13. Look up the word colloidal as it applies to particle size. What is the upper limit to
colloidal-size particles? Why do they not settle out of suspension?
14. Explain how colloidal particles can affect the components dissolved in water.
15. A commercial environmental model can map horizons in soil and layers in the
regolith. The program can also estimate the depth to each horizon and layer between
sampled points. Explain how such a representation may be used in sampling.
REFERENCES
1. Brady NC, Weil RR. The Nature and Properties of Soils. Upper Saddle River, NJ:
Prentice-Hall, 1999:223-234.
2. Svirezhev YM. Thermodynamics and theory of stability. In: Jørgensen SE, ed.
Thermodynamics and Ecological Modeling. New York: Lewis, 2000:115-132.
3. Mattigod SV, Zachara JM. Equilibrium modeling in soil chemistry. In: Bartels JM, ed.
Methods of Soil Analysis: Part 3—Chemical Methods. Madison, WI: Soil Science
Society of America and American Society of Agronomy, 1996:1309-1358.
4. Reichman R, Wallach R, Mahrer Y. A combined soil-atmosphere model for evaluating
the fate of surface applied pesticides. 1. Model development and verification. Environ
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5. Leonard RA, Knisel WG, Still DA. GLEAMS: Groundwater loading effects on
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mercury in small rural catchments. Chemosphere 1999; 39:477-492.
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Influence of soil geochemical and physical properties on the sorption and
bioaccessibility of chromium III. J Environ Qual 2003; 32:129-137.
8. Universal Soil Loss Equation.
http://soils.ecn.purdue.edu/~wepphtml/wepp/wepptut/jhtml/usle.html.
9. Revised Universal Soil Loss Equation. http://www.sedlab.olemiss.edu/rusle/.
10. Brady NC, Weil RR. The Nature and Properties of Soils. Upper Saddle River, NJ: