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In situ measurements of shear stresses of a flushing wave in a circular sewer using ultrasound
- Source :
- Water science and technology : a journal of the International Association on Water Pollution Research. 57(9)
- Publication Year :
- 2008
-
Abstract
- Deposits build up in sewer networks during both spells of dry weather and in connection with storm water events. In order to reduce the negative effects of deposit on the environment, different cleaning technologies and strategies are applied to remove the deposits. Jet cleaning represents the most widely used method to clean sewers. Another alternative cleaning procedure is flushing. On account of new developments in measurement and control panels, the flushing method is becoming more important. Therefore, in the last few years a number of new flushing devices have been constructed for application in basins, main sewers and initial reaches. Today, automatic flushing gates are able to accomplish cleaning procedures under economical and ecological conditions. The properties of flushing waves for cleaning sewers have been determined by several mathematical-numerical studies. These various investigations use altering numerical schemes, are based on different sets of physical equations and take one- or more dimensional aspects into account. Considering that bottom shear stress is the key value to evaluate the beginning of motion of any deposit, one may use this value that has to be determined by measurements. This paper deals with shear stresses caused by flushing waves which have been measured by an ultrasonic device that can determine the velocity in different depths of flow. Thus, it is possible, within certain limits, to calculate bottom shear stresses based on the log-wall law. Further discussion will deal with the requirements of measurements, its uncertainty and aspects in respect to the application of simulation of flushing waves.
- Subjects :
- Engineering
Environmental Engineering
Petroleum engineering
Sewage
business.industry
Stormwater
Drainage, Sanitary
Ultrasonic device
Models, Theoretical
Shear (geology)
Shear stress
medicine
Water Movements
Flushing
Geotechnical engineering
Ultrasonics
Sanitary sewer
Stress, Mechanical
medicine.symptom
business
Water Science and Technology
Environmental Monitoring
Subjects
Details
- ISSN :
- 02731223
- Volume :
- 57
- Issue :
- 9
- Database :
- OpenAIRE
- Journal :
- Water science and technology : a journal of the International Association on Water Pollution Research
- Accession number :
- edsair.doi.dedup.....eabafdc1a940e91665f7f09b8c75ac47