Method for diagnosing operation state of drainage system based on liquid level monitoring

Abstract

The invention discloses a method for diagnosing the operation state of a drainage system based on liquid level monitoring, and belongs to the technical field of drainage system operation state diagnosis. The method comprises the following steps that (1) optimally arranging liquid level monitoring points, and dividing a drainage system into a plurality of drainage subareas by taking the liquid level monitoring points as boundaries; (2) collecting and preprocessing the collected drainage pipe network liquid level monitoring data; (3) taking the preprocessed liquid level monitoring data as an input condition, and calculating a pipeline flow value through a Manning formula or solving a Saint-Venant system of equations; (4) checking the flow of the pipeline by using a portable flow meter, and determining the silting degree of the pipeline; and (5) calculating the sunny day average flow, the groundwater infiltration amount and the domestic sewage mixed connection amount of each drainage subarea based on the checked pipeline flow, and carrying out detailed investigation on areas with serious groundwater infiltration and serious domestic sewage mixed connection. The method is higher in diagnosis efficiency, wider in application range and universally applicable to drainage systems of large cities in China.

Description

technical field [0001] The invention relates to a method for diagnosing the running state of a drainage system, in particular to a method for diagnosing the running state of the drainage system based on liquid level monitoring, and belongs to the technical field of diagnosing the running state of the drainage system. Background technique [0002] At present, most of the urban drainage network structures in my country have been basically formed. However, in the process of urban development, there are a series of factors such as the coexistence of new and old pipe networks, disconnected design and construction, and improper maintenance and management. Problems, such as: the mixed connection of domestic sewage into the rainwater system leads to the drainage of the rainwater pumping station in dry days; the mixed connection of rainwater into the sewage pipe network leads to high water intake and low concentration of the sewage treatment plant in rainy days; groundwater infiltratio...

AI Technical Summary

Problems solved by technology

The advantage of this type of method is that it can intuitively monitor the change of pipeline flow and quantitatively analyze the non-rainwater inflow in the rainwater system, but its disadvantages are: (1) The flowmeter is expensive and is generally only installed near important nodes or discharge outlets , it is difficult to popularize in the pipeline network; (2) Due to the influence of uncertain factors such as sediment in the pipeline, the measurement accuracy of the flowmeter is difficult to guarantee

But its shortcomings are: (1) The difference in the concentration of water quality characteristic factors in time and space causes the analysis results to be closed and affects the accuracy of the analysis results; (2) This type of method can only analyze the mixing sources in the drainage system The proportion of mixed flow sources needs to be determined by the combined flow survey method; (3) When there are mixed sources that have not been considered in the system, the deviation of the calculation results is large

However, this type of method is costly, low in efficiency, and consumes a lot of manpower and material resources. It cannot detect some sewage illegal discharge behaviors, and lacks continuous monitoring of the pipe network system.

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