‘River Water DO Mechanics & New DO-Sag Equation’
Ravindra Sharma1, M.K. Verma2, Meena Murmu3
1Ravindra Sharma, (Research Scholar, Department of Civil Engg. NIT, Raipur (C.G.)
2Dr. M.K. Verma, (Professor, Department of Civil Engg. NIT, Raipur (C.G.)
3Dr. Meena Murmu, (Department of Civil Engg., NIT, Raipur (C.G.)
Manuscript received on 10 August 2019. | Revised Manuscript received on 16 August 2019. | Manuscript published on 30 September 2019. | PP: 8805-8809 | Volume-8 Issue-3 September 2019 | Retrieval Number: C6088098319/2019©BEIESP | DOI: 10.35940/ijrte.C6088.098319
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: DO modeling by Streeter Phelps equation [1] is most popular method to determine the water quality of a River. To compute DO by Streeter Phelps equation River coefficients k1 and k2 (de-oxidation and re-oxygenation) are required. Determination of these coefficients is tedious because it requires field observation of river velocity and depth over a long period of time at river site. To avoid maximum field work in calculating DO of River water DO Modeling approach is developed by combining Lab analysis of water samples DO with field data, e.g. river velocity and depth. Streeter Phelps (1925) developed the 1st important water quality model describing the BOD-DO relationship in a stream. In their pioneering work the simplest system was considered, in which biodegradable waste is discharged to the stream and consumes oxygen, atmospheric re-aeration being the only source of oxygen. The model is based on complicated solution of differential equation for above process. The equation is derived assuming River coefficients k1 and k2 as exponential function of time variation. The authors have simplified the derivation of DO-Sag equation [4] by replacing the exponential function with a quadratic polynomial. To explain the use of new equation, authors have defined the geometry of DO curve known as ‘River Water DO Mechanics’. Also in this paper, new equation is applied to make ‘Shivnath River water DO Model’ with data taken by the author as part of his Ph. D. research work. The results justify the acceptance of new modified equation for River Water Quality Assessment.
Key words- DO Modeling, River Coefficients of New DO-Sag Equation: De-Oxidation (k1), Re-Oxygenation (k2) & Super Aeration (A), River Water DO Mechanics
Scope of the Article: Biomechanics