Keywords

advective pollution load modelling, combined sewer systems, integrated modelling, lagrange, non-linear hydrologic modelling

Start Date

1-7-2012 12:00 AM

Description

For the development of real-time control systems of integrated urbanwastewater systems (IUWS) fitting a model to measurement data is an importanttask. Generally, model complexity conflicts with computational demand. Theproblem increases when multi-criteria optimization is carried out. Therefore, in thecase of IUWS modeling hydrological approaches are case dependant alternatives tofull hydrodynamic descriptions. The study presents the results of a unique flowtime test in a new IUWS in Luxembourg, a predominantly combined sewer system.During this test dry weather flow (DWF) was stored in several combined sewageoverflow tanks (CSOT) for a certain time and discharged to the downstreamwastewater treatment plant (WWTP) in a particular temporal sequence to mimiccombined sewage flow (CSF). Consequently, the analysis of the related inflowmeasurement at the WWTP allows for explicit flow time identification for eachCSOT. For the integrated sewer network a non-linear hydrologic modelingapproach is chosen as hydraulic description while pollution load modeling is basedon a Lagrange based approach. Results show good matches for both modelcalibration and validation for a real rain event. During the non-linear hydrologicsewer model calibration the CSF turns out to be very sensitive to the number oftanks in series and the Manning roughness coefficient while the DWF modeling israther insensitive to these parameters.

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Jul 1st, 12:00 AM

Transport Sewer Model Calibration by Experimental Generation of Discrete Discharges from Individual CSO Structures

For the development of real-time control systems of integrated urbanwastewater systems (IUWS) fitting a model to measurement data is an importanttask. Generally, model complexity conflicts with computational demand. Theproblem increases when multi-criteria optimization is carried out. Therefore, in thecase of IUWS modeling hydrological approaches are case dependant alternatives tofull hydrodynamic descriptions. The study presents the results of a unique flowtime test in a new IUWS in Luxembourg, a predominantly combined sewer system.During this test dry weather flow (DWF) was stored in several combined sewageoverflow tanks (CSOT) for a certain time and discharged to the downstreamwastewater treatment plant (WWTP) in a particular temporal sequence to mimiccombined sewage flow (CSF). Consequently, the analysis of the related inflowmeasurement at the WWTP allows for explicit flow time identification for eachCSOT. For the integrated sewer network a non-linear hydrologic modelingapproach is chosen as hydraulic description while pollution load modeling is basedon a Lagrange based approach. Results show good matches for both modelcalibration and validation for a real rain event. During the non-linear hydrologicsewer model calibration the CSF turns out to be very sensitive to the number oftanks in series and the Manning roughness coefficient while the DWF modeling israther insensitive to these parameters.