In-Depth Investigation of Statistical and PhysicochemicalProperties on the Field Study of the Intermittent Filling of Large Water Tanks |
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학술지명 Mathematical Problems in Engineering
저자 최두용,최태호,김도환,김종우
발표일 2017-01-31
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Large-demand customers, generally high-density dwellings and buildings, have dedicated ground or elevated water tanks to consistently supply drinking water to residents. Online field measurement for Nonsan-2 district meter area demonstrated that intermittent replenishment from large-demand customers could disrupt the normal operation of a water distribution system by taking large quantities of water in short times when filling the tanks from distribution mains. Based on the previous results of field measurement for hydraulic and water quality parameters, statistical analysis is performed for measured data in terms of autocorrelation, power spectral density, and cross-correlation. The statistical results show that the intermittent filling interval of 6.7 h and diurnal demand pattern of 23.3 h are detected through autocorrelation analyses, the similarities of the flow-pressure and the turbidity-particle count data are confirmed as a function of frequency through power spectral density analyses, and a strong cross-correlation is observed in the flow-pressure and turbidity-particle count analyses. In addition, physicochemical results show that the intermittent refill of storage tank from large-demand customers induces abnormal flowand pressure fluctuations and results in transient-induced turbid flow mainly composed of fine particles ranging within 2~4um and constituting Fe, Si, and Al. |