Method for designing drainage capacity of urban mountain torrent intercepting and draining system

Abstract

The invention discloses a method for designing the drainage capacity of an urban mountain torrent intercepting and draining system, and belongs to the technical field of urban drainage system engineering. The method for designing the drainage capacity of the urban mountain torrent intercepting and draining system is divided into three parts, firstly, the basic water depth hb of the weir crest is worked out through trial calculation by establishing the relation between the dimensionless number eta and xi, secondly, the quasi-weir water depth htb is worked out according to the overflow orifice line approaching kinetic energy Ep and the discharge flow direction angle theta factor, and thirdly, the weir water depth H is determined according to the reservoir basin shape parameter lambda. The designed urban mountain torrent intercepting and draining system is completely matched with actual engineering in drainage capacity, and the technical problems that due to the fact that no proper designmethod exists, the drainage capacity cannot be determined or the drainage capacity design is seriously insufficient, mountain torrent overflows to cause disasters, and huge economic losses and potential safety hazards are brought to flood control and waterlogging prevention engineering and cities are solved.

Description

technical field [0001] The invention belongs to the technical field of urban flood drainage system engineering, and in particular relates to a design method for the discharge capacity of an urban mountain torrent interception and drainage system. Background technique [0002] There are three main disaster-causing factors for urban waterlogging in cities with mountains on their backs and estuaries facing the sea. They are mountain torrents coming down from the mountains around the city, that is, passenger water, rainwater falling into the urban area, and the supporting effect of sea tides. Because estuary cities often have rivers passing through the city, the water system is very developed, coupled with the coastal waters, there is sufficient water vapor above the city, and the urban high-rise and super high-rise buildings are like a series of barriers, which are very easy to form obstruction effects and heat island effects, affecting the city. The stability of the atmosphere...

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Problems solved by technology

[0003] To sum up, the current calculation method of weir discharge capacity cannot be used for the calculation of discharge capacity in urban mountain torrent interception system due to profound changes in water flow environment and hydraulic conditions. The import...

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