KEY TO EXERCISE FOR EXPLORING 3D CONTAMINANT TRANSPORT, CONTINUOUS SOURCE with SORPTION and DECAY

Y = 10 m

Z =  1 m

x = 15 m

y =  5 m

z = 3 m

t = 1 year = 3.17 x 10⁷sec

v = (K * i)/ n_e = 3.0 x 10^-5m/s * 0.002 / 0.23 = 2.6 x 10^-7m/s

 

D_x= (v * alpha) + D* = 2.6 x 10^-7m/s * 10 m + 1 x 10^-9m²/s = 2.6 x 10^-6m²/s

D_y= (v * alpha * 0.2) + D* = 2.6 x 10^-7m/s * 10 m * 0.2 + 1 x 10^-9m²/s = 5.2 x 10^-7m²/s
D_z= (v * alpha * 0.1) + D* = 2.6 x 10^-7m/s * 10 m * 0.1 + 1 x 10^-9m²/s = 2.6 x 10^-7m²/s

in addition:

T _1/2 = 0.5 years

K _d = 1x10^-4 ml/mg

particle density = 2.65 g/cc

---

---

notice we have only downward spreading so in the next term we use Z rather than Z/2

---

---

---

---

---

---

---

---

---

As you can see it is very tedious to calculate these values by hand and it is easy to make an error. However, it is useful to do make the calculations a few times or to code the equation because you become very familiar with the character of the equation and the relative size of values that are important to the solution.

CLICK HERE IF YOU WOULD LIKE TO REVIEW THE DISCUSSION REGARDING CHECKING UNITS