2014 Progress Report: Prediction and quantification of Combined Sewer Outflows under extreme storm events: Flow dynamics and Reduction of Combined Sewer OutflowsEPA Grant Number: R835187
Title: Prediction and quantification of Combined Sewer Outflows under extreme storm events: Flow dynamics and Reduction of Combined Sewer Outflows
Investigators: Leon, Arturo , Alnahit, Ali , Choi, YunJi , Elayeb, Ibrahem
Current Investigators: Leon, Arturo
Institution: Oregon State University
EPA Project Officer: Hiscock, Michael
Project Period: June 1, 2012 through May 31, 2017
Project Period Covered by this Report: June 1, 2014 through May 31,2015
Project Amount: $265,528
RFA: Extreme Event Impacts on Air Quality and Water Quality with a Changing Global Climate (2011) RFA Text | Recipients Lists
Research Category: Global Climate Change , Earth Sciences - Environmental Science , Aquatic Ecology and Ecosystems , Aquatic Ecosystems , Air Quality and Air Toxics , Water Quality , Climate Change , Air , Water
- To develop a mathematical formulation for common cases of overflow discharges (e.g., combined sewer overflows [CSOs]) at vertical shafts and near-horizontal outlets under extreme flow events.
- To implement the mathematical formulation of overflows into a state-of-the-art open source (free and open access) transient flow model that can be used in complex combined sewer systems (CSSs).
- To validate the overflow discharge framework under highly dynamic flow conditions. The Portland combined sewer system (Oregon), which has experienced recent geysering events, will be used as a test case.
As of September 27, 2015, the following progress has been achieved:
- The mathematical formulation of common cases of overflow discharges at vertical shafts is under development.
- A 3D computational fluid dynamics (CFD) two-phase flow model has been validated.
- The flow recirculation system that will host the hydraulic model of the Portland CSS was constructed.
- Extensive experiments are being conducted at the constructed equipment.
- The mathematical formulation of common cases of overflow discharges at vertical shafts will be further developed, validated, and implemented into the state-of-the-art transient analysis program Illinois Transient Model (ITM).
- More extensive laboratory experiments of overflow discharges under extreme events will be conducted in the Multipurpose River Hydraulics Research Facility at O.H. Hinsdale Wave Research Laboratory at Oregon State University. The lab experiments will use CO2 gas.