Page 416 - Soil and water contamination, 2nd edition

Answers to exercises 403

CHAPTER 15
6
6
4. 4 = 1296 model runs for four model parameters; 6 = 46 656 model runs for six
parameters.
2
5. a. R = 0.918
b. Nash efficiency coefficient = 0.868
c. t = 0.988; t = 2.069 for 23 degrees of freedom. Hence, we cannot reject the null
0
hypothesis that the mean difference between the observed and predicted values differs
significantly from zero.

CHAPTER 16

2. 37.8 g m -2

-1
3. 382 mg kg ; the sample is more contaminated than the area average (Y > Y ).
m r
4. b. 0.30 mg kg -1
c. 1) samples from the topsoil and the deeper soil are of the same origin (same parent
material) and 2) the deeper soil is not contaminated.

CHAPTER 17

3. 1) Enhanced atmospheric deposition of acids and 2) oxidation of pyrite by agriculturally
derived nitrate.
-1
-1
4. Forest: approximately 400 mm y ; heather: approximately 585 mm y .
5.
Distance from landfill (m)
0 50 100 150 200 250 300

m above sea level 38 -200 -200 700 800
40
36
34
32
30
28 -300 -100 500 6642 6642 6642
26

CHAPTER 18

3. a. peak concentration before peak discharge;
b. trough concentration after peak discharge;
c. peak concentration after peak discharge;
d. trough concentration before peak discharge.

10/1/2013 6:47:54 PM
Soil and Water.indd 415
Soil and Water.indd 415 10/1/2013 6:47:54 PM