NETWORK WATER QUALITY MODELING WITH STOCHASTIC WATER DEMANDS AND MASS DISPERSION

NETWORK WATER QUALITY MODELING WITH STOCHASTIC WATER DEMANDS AND MASS DISPERSION

Bibliographic Details
Main Author: LI, ZHIWEI
Language:English
Published: University of Cincinnati / OhioLINK 2006
Subjects:
Water Quality Modeling
Stochastic Water Demands
Hydrodynamic Dispersion
Time Scale
Water Distribution Network
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=ucin1147989825
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-ucin11479898252021-08-03T06:11:11Z NETWORK WATER QUALITY MODELING WITH STOCHASTIC WATER DEMANDS AND MASS DISPERSION LI, ZHIWEI Water Quality Modeling Stochastic Water Demands Hydrodynamic Dispersion Time Scale Water Distribution Network A new computer model, ADRNET, is developed to predict the spatial and temporal distribution of disinfectant in a pipe network, considering stochastic water demands and unsteady mass dispersion. An Eulerian-Lagrangian scheme is combined with a numerical Green’s Function technique to solve the advection-dispersion-reaction equation efficiently in network conditions. In a comparison with the industry standard advection-reaction water quality model (EPANET), ADRNET exhibits better agreement with field observations at locations where laminar flow is prevalent. Implementation of the ADRNET model is preceded by three ancillary studies. The first study investigates the effect of temporal averaging on stochastic pipe flows to identify the appropriate time scales for water quality modeling of distribution networks. For this purpose, a non-homogeneous Poison Rectangular Pulse (PRP) process is utilized to simulate high resolution residential water demands in a distribution network. Two water demand models are successfully established to demonstrate variability and frequency of regimes for PRP flows as function of time scale. The results show that the variance of time-averaged PRP random flows is inversely proportional to the time scale; the frequency of flow regimes depends on both the time scale and the mean of the random flows. The second study investigates the conditions under which mass dispersion is important in pipe networks through comparison of numerical simulations with and without dispersive transport. The results show that mass dispersion is always important in laminar flow zones, and the importance of dispersion increases with increasing pipe diameter but decreases with increasing of reaction rate coefficient. Finally, the effect of temporal scale on unsteady dispersion is studied through both theoretical analyses with periodic binary flow pulses and numerical simulation with PRP random laminar flows. For small diameter tubes, unsteady dispersion decreases with increasing time scale in unsteady laminar flows. For an actual network pipe, however, the time scale has little effect on unsteady dispersion in completely laminar flows. 2006-07-20 English text University of Cincinnati / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ucin1147989825 http://rave.ohiolink.edu/etdc/view?acc_num=ucin1147989825 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Water Quality Modeling
Stochastic Water Demands
Hydrodynamic Dispersion
Time Scale
Water Distribution Network
spellingShingle Water Quality Modeling
Stochastic Water Demands
Hydrodynamic Dispersion
Time Scale
Water Distribution Network
LI, ZHIWEI
NETWORK WATER QUALITY MODELING WITH STOCHASTIC WATER DEMANDS AND MASS DISPERSION
author LI, ZHIWEI
author_facet LI, ZHIWEI
author_sort LI, ZHIWEI
title NETWORK WATER QUALITY MODELING WITH STOCHASTIC WATER DEMANDS AND MASS DISPERSION
title_short NETWORK WATER QUALITY MODELING WITH STOCHASTIC WATER DEMANDS AND MASS DISPERSION
title_full NETWORK WATER QUALITY MODELING WITH STOCHASTIC WATER DEMANDS AND MASS DISPERSION
title_fullStr NETWORK WATER QUALITY MODELING WITH STOCHASTIC WATER DEMANDS AND MASS DISPERSION
title_full_unstemmed NETWORK WATER QUALITY MODELING WITH STOCHASTIC WATER DEMANDS AND MASS DISPERSION
title_sort network water quality modeling with stochastic water demands and mass dispersion
publisher University of Cincinnati / OhioLINK
publishDate 2006
url http://rave.ohiolink.edu/etdc/view?acc_num=ucin1147989825
work_keys_str_mv AT lizhiwei networkwaterqualitymodelingwithstochasticwaterdemandsandmassdispersion
_version_ 1719432342322282496

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