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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Effects of reaeration coefficient on river water dissolved oxygen, dinachal river, iran
Effects of reaeration coefficient on river water dissolved oxygen, dinachal river, iran
Author : MEHDI MOHAMMADIGHALENI(1), KUMARS EBRAHIMI(2)&MOHAMMAD HOSEIN OMID(3)
ABSTRACT
The main aim of this paper is to evaluate the effects of reaeration coefficient on the river water dissolved oxygen, case
study Dinachal River, IRAN. To achieve this goal, water quality samples were collected along a reach of 2 kilometers of
the river in September 2013. Electrical Conductivity, pH, Dissolve Oxygen, Biochemical Oxygen Demand, Nitrate and
Phosphorus are the main quality parameters which were measured in laboratory, using the above mentioned collected
water samples. Streeter-Phelps model has been used to simulate dissolved oxygen in the river analytically and to improve
the output of the model; advection, dispersion and decay rate terms were included to the basic form of the Streeter-Phelps
equation. Also, dissolved oxygen concentration in the river has been simulated involving FTCS, QUICKEST, Upstream
and Lax-Wendroff numerical methods. The reaeration coefficient has been estimated using four empirical equations
including; Oconnor-Dobbins, Langbein-Durum, Boulton and Ling et al. The results show that Up-stream numerical method
containing Boulton reaeration Coefficient equation has the most accurate results, with the amounts of Pearson correlation
coefficient and Mean Absolute Errors equal to 0.995 and 0.033, respectively. Generally speaking, numerical methods in
contrast to analytical solution of the Streeter-Phelps equation showed more accurate results, which is due to existing of
the empirical coefficients in the Streeter-Phelps equation.
File Size : 561,544 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 28/08/2015
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