The base of a river in in contact with the top of an aquifer. A truck carrying bags of powdered cyanide is on abridge crossing the river when a large bump causes one of the bags to fall into the river. The water in theriver suddenly becomes polluted by the cyanide with a concentrations of 6.78 mg/L. The aquifer has anaverage linear ground water velocity of 0.256 m/day. Laboratory analyses data indicates that longitudinaldispersivity can be found through the equation: a = 0.86(log Ls)² where Ls is the length of the straightline path between two points along the path of transport.Find the longitudinal dispersion 108 m downstream from the bridge. Assume that the cyanide solute has adiffusion coefficient of 3.6 x 10 -5 m²/s and the aquifer has a coefficient related to tortuosity (o) equal to 0.8.Find the coefficient of hydrodynamic dispersion.

solution-The foundation of a waterway is in touch with the highest point of a spring. A truck…

sing the river when a large bump causes one of the ba nly becomes polluted by the cyanide with a concentrati ear ground water velocity of 0.256 m/day. Laboratory a can be found through the equation: a = 0.86(log Ls) tween two points along the path of transport. ait linol 100

sing the river when a large bump causes one of the ba nly becomes polluted by the cyanide with a concentrati ear ground water velocity of 0.256 m/day. Laboratory a can be found through the equation: a = 0.86(log Ls) tween two points along the path of transport. ait linol 100

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

The base of a river in in contact with the top of an aquifer. A truck carrying bags of powdered cyanide is on a
bridge crossing the river when a large bump causes one of the bags to fall into the river. The water in the
river suddenly becomes polluted by the cyanide with a concentrations of 6.78 mg/L. The aquifer has an
average linear ground water velocity of 0.256 m/day. Laboratory analyses data indicates that longitudinal
dispersivity can be found through the equation: a = 0.86(log Ls)² where Ls is the length of the straight
line path between two points along the path of transport.
Find the longitudinal dispersion 108 m downstream from the bridge. Assume that the cyanide solute has a
diffusion coefficient of 3.6 x 10 -5 m²/s and the aquifer has a coefficient related to tortuosity (o) equal to 0.8.
Find the coefficient of hydrodynamic dispersion.

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