東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Water Quality and Hydraulic Trade-Of...

Gibson, John.

Linked to FindBook

Google Book

Amazon

博客來

Water Quality and Hydraulic Trade-Offs in Drinking Water Distribution Networks.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Water Quality and Hydraulic Trade-Offs in Drinking Water Distribution Networks./
Author:	Gibson, John.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	129 p.
Notes:	Source: Dissertations Abstracts International, Volume: 81-04, Section: B.
Contained By:	Dissertations Abstracts International81-04B.
Subject:	Water resources management. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13806010
ISBN:	9781085787956

Water Quality and Hydraulic Trade-Offs in Drinking Water Distribution Networks.
Gibson, John.

Water Quality and Hydraulic Trade-Offs in Drinking Water Distribution Networks. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 129 p.

Source: Dissertations Abstracts International, Volume: 81-04, Section: B.

Thesis (Ph.D.)--University of Toronto (Canada), 2019.

This item must not be sold to any third party vendors.

Historically, water distribution network design focused on providing water at the appropriate flow and pressure, particularly during high-demand and firefighting conditions. More recently, it was discovered that 18% of waterborne disease outbreaks in the U.S. could be linked to deficiencies in the distribution network (DN), shifting the distribution network research focus towards water quality. This thesis uses genetic algorithms to assess some of the tensions between providing high flows for firefighting and water quality in drinking water distribution networks. It is shown that relaxing the traditional design restrictions on minimum pipe diameters (i.e., that they be greater than 150 mm) can provide an improved balance of fire flow, water quality, and cost. Using genetic algorithms to generate a series of Pareto Fronts, it is shown that there are significant trade-offs between fire flow and achieving high flow velocities associated with establishing self-flushing pipes. Self-flushing pipes are believed to reduce high-turbidity water events, a major source of consumer complaints. A Monte Carlo simulation suggests that a velocity of 0.10 to 0.25 m/s is self-flushing. An additional benefit of high velocity networks may include better disinfectant mass transfer to the pipe wall, where opportunistic pathogens are likely to be found. To achieve these higher velocities, this work suggests a need to relax minimum pipe diameters, reduce redundant network loops, and reduce available fire flows. This approach is now used in several European countries but has yet to be adopted in North America. Finally, it is shown that health risks associated with intrusion remain relatively constant over time, even as the number of defects in the pipe and intrusion volume increase. It is suggested that health risks are a weak function of intrusion volume. Important risk factors for intrusion likely include the number of low-pressure events and the average pipe residence time.

ISBN: 9781085787956Subjects--Topical Terms:

794747
Water resources management.
Subjects--Index Terms:

Distribution network

Water Quality and Hydraulic Trade-Offs in Drinking Water Distribution Networks.
LDR:03141nmm a2200361 4500 001 2270366
005 20200929060907.5
008 220629s2019 ||||||||||||||||| ||eng d
020 $a 9781085787956
035 $a (MiAaPQ)AAI13806010
035 $a AAI13806010
040 $a MiAaPQ $c MiAaPQ
100 1 $a Gibson, John. $3 3386405
245 1 0 $a Water Quality and Hydraulic Trade-Offs in Drinking Water Distribution Networks.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2019
300 $a 129 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-04, Section: B.
500 $a Advisor: Karney, Bryan;Guo, Yiping.
502 $a Thesis (Ph.D.)--University of Toronto (Canada), 2019.
506 $a This item must not be sold to any third party vendors.
520 $a Historically, water distribution network design focused on providing water at the appropriate flow and pressure, particularly during high-demand and firefighting conditions. More recently, it was discovered that 18% of waterborne disease outbreaks in the U.S. could be linked to deficiencies in the distribution network (DN), shifting the distribution network research focus towards water quality. This thesis uses genetic algorithms to assess some of the tensions between providing high flows for firefighting and water quality in drinking water distribution networks. It is shown that relaxing the traditional design restrictions on minimum pipe diameters (i.e., that they be greater than 150 mm) can provide an improved balance of fire flow, water quality, and cost. Using genetic algorithms to generate a series of Pareto Fronts, it is shown that there are significant trade-offs between fire flow and achieving high flow velocities associated with establishing self-flushing pipes. Self-flushing pipes are believed to reduce high-turbidity water events, a major source of consumer complaints. A Monte Carlo simulation suggests that a velocity of 0.10 to 0.25 m/s is self-flushing. An additional benefit of high velocity networks may include better disinfectant mass transfer to the pipe wall, where opportunistic pathogens are likely to be found. To achieve these higher velocities, this work suggests a need to relax minimum pipe diameters, reduce redundant network loops, and reduce available fire flows. This approach is now used in several European countries but has yet to be adopted in North America. Finally, it is shown that health risks associated with intrusion remain relatively constant over time, even as the number of defects in the pipe and intrusion volume increase. It is suggested that health risks are a weak function of intrusion volume. Important risk factors for intrusion likely include the number of low-pressure events and the average pipe residence time.
590 $a School code: 0779.
650 4 $a Water resources management. $3 794747
650 4 $a Engineering. $3 586835
653 $a Distribution network
653 $a Pareto fronts
653 $a Self-flushing pipes
653 $a Fire flow
653 $a Firefighting
690 $a 0595
690 $a 0537
710 2 $a University of Toronto (Canada). $b Civil Engineering. $3 2104053
773 0 $t Dissertations Abstracts International $g 81-04B.
790 $a 0779
791 $a Ph.D.
792 $a 2019
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13806010