Modelling of flushing waves for optimising cleaning operations

Dettmar, Joachim; Staufer, Philipp

doi:10.2166/wst.2005.0138

Cited by 18 publications

(9 citation statements)

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“…The Hydrass flushing gate and field validation of flush propagation modelling were suggested for the flush cleaning of sewers [17,18]; a cleaning operation including installation of a sediment trap or a flushing sump/chamber in front of outlet [19]. The 1D De Saint Venant-Exner equations were applied to numerical modelling [20].…”

Section: Introductionmentioning

confidence: 99%

Predicting Sedimentation in Urban Sewer Conduits

Yangho

Yun

Lee

et al. 2018

Water

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Sedimentation commonly occurs in urban drainage systems, disrupts flow, and is one of the major causes of inundation. The complicated phenomena that alter the cross-section of sewer conduits include transportation, precipitation, and sedimentation, and need to be analyzed for the proper design and efficient maintenance of urban drainage systems. In this study, the discharge capacity of urban drainage systems is simulated and analyzed by considering the pattern of flow of sediments in sewer conduits through a numerical analysis model. The sites of the highest and lowest accumulation of soil were examined as sedimentation occurred, as was discharge due to accumulation in sewer conduits. The purpose of this study is the examination of mathematical models for two-phase fluid flow analysis and the prediction of sedimentation in urban sewer conduits. An expression for the height of the sedimentation was obtained to assess the discharge capacity of urban drainage systems, and a model to predict accumulation in sewer conduits was developed using non-dimensional variables for inlet velocity, inlet particle volume fraction, and particle size. When subjected to linear regression analysis, the model yielded a high correlation coefficient (R 2 ) of 0.899. This satisfied the aims of this study, to obtain a higher discharge capacity and a plan for the design of urban drainage systems.

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Section: Introductionmentioning

confidence: 99%

Predicting Sedimentation in Urban Sewer Conduits

Yangho

Yun

Lee

et al. 2018

Water

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“…In particular, among the existing cleaning devices adopted in sewers, flushing gates have proved to be a valid cost-effective solution (Chebbo et al 1996, Bardin et al 2005, Dettmar and Staufer 2005. These devices are commonly inserted in-line in sewer channels and are designed in order to produce consecutive flushing waves able to mobilise deposited solids and to transport them towards steeper trunks (with minor deposition problems) or interception devices.…”

Section: Introductionmentioning

confidence: 99%

Laboratory investigation on the effects of flushes on cohesive sediment beds

Campisano

Creaco

Modica

2008

Urban Water Journal

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Hydraulic flushing gates have recently been successfully adopted for the removal of sewer sediments. A large number of researches are aimed at the evaluation of the performances of these devices in the case of granular sediment deposits, but little information exists about the effectiveness of flushes on cohesive sediments as yet in literature. The current paper reports the results of an experimental investigation on the erosive performances of flushing waves on cohesive sediment beds. Experiments were performed in a laboratory flume adopting two flushing hydraulic conditions and comparing the erosive effects on cohesive and granular sediment beds. Different behaviours of\ud cohesive sediments were observed during flushing operations: in particular, erosive effects in cohesive sediment beds were observed to be smaller than in granular sediments during initial flushes whereas erosion in cohesive sediments proved to be higher during subsequent flushes

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“…For this, the stored water is used to generate intermittent dam-break waves. If properly designed, such an operation offers the possibility to prevent the accumulation of sediments (Dettmar and Staufer 2005) thus reducing pollution impacts to the receiving waters and personnel-and cost-intensive cleaning of the sewers (Campisano et al 2004, Bertrand-Krajewski et al 2005. If properly controlled, gates can be inserted at the outflow section of storage facilities and utilised as flow rate regulators offering, for instance, the possibility of extended storage time to improve the removal efficiency for suspended solids and agglomerated pollutants (Middleton and Barrett 2008).…”

Section: Weirs Gates and Inflatable Damsmentioning

confidence: 99%

Potential and limitations of modern equipment for real time control of urban wastewater systems

Campisano

Ple²,

Muschalla

et al. 2013

Urban Water Journal

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Real Time Control (RTC) has become an accepted technique for improving the performance of Urban Drainage Systems (UDS) due to its flexibility and sustainability. Numerous implementations of RTC have been reported during the last decades. At the same time, guideline documents and state-of-the-art reports have been published. Whereas the general aspects and challenges of planning and installation of RTC systems are well covered, there is a lack of information about the adequate equipment for RTC of UDS. After identifying and briefly discussing the basic components of RTC systems for UDS, this paper describes the specific components in detail. This comprises the introduction of available technologies for sensors, actuators, controllers and telemetry systems in the context of RTC and the discussion of their potential and limitations. Lessons learned from the field operational experiences and future trends and challenges are identified.

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Modelling of flushing waves for optimising cleaning operations

Cited by 18 publications

References 0 publications

Predicting Sedimentation in Urban Sewer Conduits

Predicting Sedimentation in Urban Sewer Conduits

Laboratory investigation on the effects of flushes on cohesive sediment beds

Potential and limitations of modern equipment for real time control of urban wastewater systems

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