Chapter 18, Problem 1E

(a)

To determine

The time required for a dune to move a distance of 500 meters if the dunes in a field of barchan sand dunes are moving at an average long term rate of $30$ meters $\left(\text{100}\text{feet}\right)$ a year.

(b)

To determine

The time required for a dune to cross an abandoned 100 meters wide airport runway completely if the dunes in a field of barchan sand dunes are moving at an average long term rate of $30$ meters $\left(\text{100}\text{feet}\right)$ a year.