Docsity
Docsity

Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity


Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan


Guidelines and tips
Guidelines and tips

Elevation, Pressure - Soil Physics - Solved Home Work, Exercises of Soil Physics

Soil physics is the study of soil physical properties and processes. It is applied to management and prediction under natural and managed ecosystems. (Wikipedia). Keywords in this solved assignment are: Elevation, Pressure, Total Potential, Potential Difference, Daily Outflow, Density, Water, Components, Iron, Buoyance

Typology: Exercises

2012/2013

Uploaded on 12/31/2013

kid
kid 🇮🇳

4.3

(18)

111 documents

1 / 2

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
name
1) Using this figure, give the elevation,
pressure, and total potential at the labeled
points A, B, C, and D. Assume that the
outflow, at point “D”, has an elevation of
0 cm.
2) Using this figure, give the elevation, pressure, and total potential
at the labeled points A, B, C, and D. Assume that the outflow, at
point “D”, has an elevation of 0 cm.
The potential difference through the soil is 30 cm, but
the distance through the soil is only 25 cm. The
gradient is therefore 6/5. So 60% of the way up into
the soil, the total potential must be 60% of 30, which is
18.
Point Pressure, cm Elevation, cm Total potential, cm
A 5 15 15
B 15 0 15
C 15 0 15
D 0 0 0
Point Pressure, cm Elevation, cm Total potential, cm
A 0 30 30
B 5 25 30
C 3 15 18
D 0 0 0
15 cm soil
5 cm water
A
D
B
C
10 cm soil
15 cm soil
5 cm water
A
D
B
C
10 cm soil
25 cm soil
5 cm water
A
D
BC
10 cm big pipe
10 cm
big pipe 25 cm soil
5 cm water
A
D
BC
10 cm big pipe
10 cm
big pipe
docsity.com
pf2

Partial preview of the text

Download Elevation, Pressure - Soil Physics - Solved Home Work and more Exercises Soil Physics in PDF only on Docsity!

name

  1. Using this figure, give the elevation, pressure, and total potential at the labeled points A, B, C , and D. Assume that the outflow, at point “ D ”, has an elevation of 0 cm.

  2. Using this figure, give the elevation, pressure, and total potential at the labeled points A, B, C , and D. Assume that the outflow, at point “ D ”, has an elevation of 0 cm.

The potential difference through the soil is 30 cm, but the distance through the soil is only 25 cm. The gradient is therefore 6/5. So 60% of the way up into the soil, the total potential must be 60% of 30, which is

Point Pressure, cm Elevation, cm Total potential, cm

A 5 15 15

B^15 0

C 15 0 15

D 0 0 0

Point Pressure, cm Elevation, cm Total potential, cm

A 0 30 30

B 5 25 30

C 3 15 18

D 0 0 0

15 cm soil

5 cm water

A

D

B

C

10 cm soil

15 cm soil

5 cm water

A

D

B

C

10 cm soil

25 cm soil

5 cm water A

B (^) C D

10 cm big pipe

10 cm big pipe 25 cm soil

5 cm water A

B (^) C D

10 cm big pipe

10 cm big pipe

docsity.com

  1. You have the physical setup shown in the diagram. Soil A has K = 5 cm/hr; soil B has K = 7 cm/hr. Each tube has a cross-sectional area of 1 m^2. Calculate the daily outflow from each tube.

A: Change in head (height + pressure) is 4 m; distance through soil is 7 m; so gradient = 4/7.

0.05 m/hr * 24 hr * 1 m^2 * (4/7) = 0.686 m^3

B: Change in head is m 4, distance through soil is 5 m, so gradient = 4/5.

0.07 m/hr * 24 hr * 1 m^2 * (4/5) = 1.344 m^3

  1. I have a 1.1 kg chunk of iron, and I want to know whether it is solid, or has some gas-filled bubbles. My CRC handbook tells me that iron has a density of 5500 kg m-3. Assume that the gas bubbles, if present, have a density of 0 kg m-3.

(a) If the chunk is solid (has no bubbles) and I put it into a beaker that is full of water, how much water will spill out of the beaker?

A 1.1 kg chunk of pure iron has a volume (1.1 kg / 5.5 kg/L) = 0.2 L. So if it were placed in a beaker full of water, 0.2 L would spill out.

(b) I weigh the chunk suspended from my balance and submerged in a beaker of water (see diagram), and the balance reads a mass of 0. kg. Assuming that the only components are iron and (possibly) gas bubbles, what is its porosity?

If the chunk had no bubbles, then it would displace 0.2 L of water, so its mass in water would be reduced by 0.2 kg due to buoyancy. 1.1 kg – 0.2 kg = 0.9 kg, so the balance would read 0.9 kg if there were no bubbles.

Instead, the balance read 0.8 kg, so buoyancy decreased its apparent mass 1.5 times as much as expected (by 0.3 kg, rather than 0.2 kg). Therefore its volume is 1.5 times what it would be if it were pure iron. That extra

volume of 0.1 L is bubbles, and they occupy 1/3 of the total volume. So φφφφ =

1 m water

3 m soil A

4 m soil A

5 m soil B

1 m water

3 m soil A

4 m soil A

5 m soil B

docsity.com