4 8 there is a gasoline spill in a major river the mayor of a large do
4.8 There is a gasoline spill in a major river. The mayor of a large
downstream city demands an estimate of how many hours it
will take for the spill to get to the water supply plant intake. The
emergency responders measure the speed of the leading edge
of the spill, effectively focusing on one particle of fluid. Mean-
while, environmental engineers at the local university employ a
computer model, which simulates the velocity field for any stage
of the river and for all locations (including steep narrow canyon
sections with fast velocities and an extremely wide reach with
slow velocities). To compare these two mathematical approaches,
which of the following statements is most correct?
a. The responders have an Eulerian approach, and the engi-
neers have a Lagrangian one.
b. The responders have a Lagrangian approach, and the engi-
neers have an Eulerian one.
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