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Water quality modeling of the Aguas Claras stream, canton Quevedo, Ecuador

Abstract:

This paper studies the behavior of dissolved oxygen (DO) and biochemical oxygen demand (BOD) in the Aguas Claras stream, located southwest of Quevedo. The impact of the modeling conditions the calibration process, which consisted of adjusting the kinetic constant reaeration (ka), deoxygenation (kd) and total removal of the BOD (kr), using the GLUE methodology, through Monte Carlo simulations. The study shows that ka is greater than (kd), a condition indicating a high potential for self-purification, while high values of kr are attributed to shallow low-depth currents, demonstrating that they are relatively simple systems to biodegrade. Finally, the performance analysis of the OD and BOD showed differences less than 10% for the Streeter-Phelps model and more than 50% for QUAL2K software, due to the lack of information required by the model of ka and kr.