3.8. Fifty kilograms of a tracer is instantaneously released across over the entire width of a lake that is 25 m wide, 60 m long, and 3 m deep. If the tracer is released across the midpoint of the lake and the diffusion coefficient is estimated as 30 m²/d, esti- mate the concentration on the lake shorelines across the width of the lake after 60 days.

3.8. Fifty kilograms of a tracer is instantaneously released across over the entire width of a lake that is 25 m wide, 60 m long, and 3 m deep. If the tracer is released across the midpoint of the lake and the diffusion coefficient is estimated as 30 m²/d, esti- mate the concentration on the lake shorelines across the width of the lake after 60 days.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

Concentrations of toxaphene in fish may impair human health and fish-eating birds (such as bald eagles) that feed on the fish. What route of exposure is greatest for a higher-risk group that is assumed to consume 100 g fish per day? Assume the following correlation applies to toxaphene and our problem’s specific fish: log BCF = 0.85 * log Kow – 0.07
2.In a water tank with a diameter of 2 meters and a temperature of 60 °F, certain particles settle through a suspension that contains 30% solids by weight. The particles have a density of 2500 kg/m3 and a diameter of 0.064 mm. To determine settling velocity of particles use Francis' Equation and the Maude and Whitmore Equation
Poorly treated municipal wastewater is continuously discharged directly into a lake. The discharge from the wastewater plant into the lake occurs at a flow of Qd = 1 m3/hr. The concentration of phosphate (PO43, M = 95 g/mol) in the discharge flow (Cxd) that is decaying with first-order kinetics is 100 mg/L. The lake is a well-mixed water body of 100 m3. (Phosphate is naturally uptaken by algae with a first- order decay rate constant equal to 0.20/day.) The concentration of phosphate in the incoming river (Cx,r) is 10 mg P/L. The incoming river flow rate is Q, = 10 m3/hr. %3D a) Which of the following equations represent the correct mass balance equation? O va = CxQr - CxdQd -QoutCxvout" kCx,outV %3D O 0 = Cx,Qr + CxdQd -QoutCxvout" kCx,outV X,r O 0 = CxQr + CxdQd -QoutCxvout- kV O 0 = Cx,dQr + Cx,,Qd -QoutCxout- kCxoutV
Fifteen kilograms of contaminant is spilled into a stream 5 m wide and 1 m deep. The flow in the river is 2 m3/s, the longitudinal diffusion coefficient is 3 m2/s, and the decay constant is 50 d−1. A) Determine the maximum concentration in the stream at a drinking-water intake 1 km downstream from the spill. B) How would this concentration be affected if the decay constant is actually one- half of the estimated value?
Solve it
Hydrogen is allowed to diffuse through a palladium plate that is 0.008m thick at 500°C. The concentrations of hydrogen at the two faces are 0.65 and 0.30 kg/m³, which are maintained constant. The diffusion coefficient at this temperature is 6.13x10-11 m²/s. Calculate the diffusion flux in units of kg/m²s.
6
Find out after how much time only 2% chlorine will remain in the water sample if its half-life is 6 days.
An identified source of irrigation water has ion concentrations of Nat, Catt and Mgt as 20, 10 and 8 mill-equivalent per liter, respectively. The SAR of this water is approximately:
Adsorption of methane follows the Langmuir adsorption isotherm at 90K. If P = 1.896 cm3/g/bar and b = 0.146 bar-1. Calculate the value of θ.
Entropy can be used as a measure of the overall health of an ecosystem—higher entropy correlates with better health. A thermal image of a landscape, where color indicates temperature, can be used for a quick assessment. What would be the thermal signature of a healthy ecosystem?