The initial dissolved oxygen (DO) and BOD concentrations at a reference point of a stream with an average water flow rate of 8 m³/s are measured around 6 and 50 mg/L, respectively. The averages values for the width (W) and depth (h) of water in stream are reported as 12m and 1m, respectively. The BOD degradation rate constant (k₁) and water temperature are given as 0.26 d'¹ and 25 °C. a) Calculate dissolved oxygen concentrations and oxygen vacancies (AA) by distance from the reference point (1 - 500 km) downstream and plot data (distance vs DO and distance vs AA) using excel spreadsheet. b) Calculate the critical oxygen concentration (PA2(c)) and oxygen vacancy (AA) and compare the values with those obtained from the excel graph. c) Calculate the critical distance (X) for the maximum oxygen vacancy and compare it to one you obtain from the excel graph. d) Calculate BOD concentration at the critical distance as mg/L. e) Calculate the distance (X) required to regain %90 oxygen saturation in the stream.
The initial dissolved oxygen (DO) and BOD concentrations at a reference point of a stream with an average water flow rate of 8 m³/s are measured around 6 and 50 mg/L, respectively. The averages values for the width (W) and depth (h) of water in stream are reported as 12m and 1m, respectively. The BOD degradation rate constant (k₁) and water temperature are given as 0.26 d'¹ and 25 °C. a) Calculate dissolved oxygen concentrations and oxygen vacancies (AA) by distance from the reference point (1 - 500 km) downstream and plot data (distance vs DO and distance vs AA) using excel spreadsheet. b) Calculate the critical oxygen concentration (PA2(c)) and oxygen vacancy (AA) and compare the values with those obtained from the excel graph. c) Calculate the critical distance (X) for the maximum oxygen vacancy and compare it to one you obtain from the excel graph. d) Calculate BOD concentration at the critical distance as mg/L. e) Calculate the distance (X) required to regain %90 oxygen saturation in the stream.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:The initial dissolved oxygen (DO) and BOD concentrations at a reference point of a
stream with an average water flow rate of 8 m³/s are measured around 6 and 50 mg/L,
respectively. The averages values for the width (W) and depth (h) of water in stream are reported
as 12m and 1m, respectively. The BOD degradation rate constant (k₁) and water temperature are
given as 0.26 d'¹ and 25 °C.
a) Calculate dissolved oxygen concentrations and oxygen vacancies (AA) by distance from the
reference point (1 - 500 km) downstream and plot data (distance vs DO and distance vs
AA) using excel spreadsheet.
b) Calculate the critical oxygen concentration (PA2(c)) and oxygen vacancy (AA) and compare
the values with those obtained from the excel graph.
c) Calculate the critical distance (Xer) for the maximum oxygen vacancy and compare it to one
you obtain from the excel graph.
d) Calculate BOD concentration at the critical distance as mg/L.
e) Calculate the distance (X) required to regain %90 oxygen saturation in the stream.
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