Showing papers by "Jorge D. Abad published in 2010"

Modeling Framework for Organic Sediment Resuspension and Oxygen Demand: Case of Bubbly Creek in Chicago

Abstract: A modeling framework that combines both two-dimensional (2D) and one-dimensional (1D) numerical models for the evaluation of organic-matter transport across the bed-water interface is presented Emphasis is placed on capturing oxygen demand in the water column associated with the resuspension of organic sediments from the bottom The proposed numerical approach solves the hydrodynamics coupled with sediment transport and water quality dynamics and represents a substantial improvement to the state of the art of water quality modeling methodologies available in the literature A biochemical oxygen demand (BOD)–dissolved oxygen (DO) water quality module is incorporated into the 2D depth-averaged numerical model STREMR-HySedWq The model is applied to the South Fork of the South Branch of the Chicago River, known as Bubbly Creek, with the goal of modeling combined sewer overflow (CSO) events and their impact on DO levels in the short-term (hours or days) Given the intermittent nature of this kind of events,

Sidestream Elevated Pool Aeration, a Technology for Improving Water Quality in Urban Rivers

Abstract: The potential impact of the SEPA stations on the DO concentrations in the Matanza-Riachuelo River was evaluated with two alternative 1D water quality numerical models: an advection-diffusion-reaction model developed by the University of Illinois and the water quality model QUAL2Kw Both models were coupled with HEC-RAS which provided the hydrodynamics in the river The analysis provided the optimum number of SEPA stations required to meet a minimum DO concentration of 2 mg/l everywhere in the river It was assumed that all the SEPA stations would abstract 50% of the river discharge with an efficiency of 80%