Utility tunnel gas leakage concentration field prediction and correction and leakage rate estimation method

Abstract

The invention discloses a utility tunnel gas leakage concentration field prediction and correction and leakage rate estimation method. The utility tunnel gas leakage concentration field prediction andcorrection and leakage rate estimation method integrates real-time monitoring data of a gas sensor, a wind speed and direction sensor and a temperature and humidity sensor inside a utility tunnel, structures a numerical calculation model of gas leakage and diffusion inside the utility tunnel and applies a data assimilation method to predict and estimate of a gas leakage and diffusion process andthe gas pipe leakage rate, wherein the data assimilation method is an improved ensemble Kalman filter algorithm, and the state vectors of the improved ensemble Kalman filter algorithm are composed ofgas concentration and the leakage rate. The utility tunnel gas leakage concentration field prediction and correction and leakage rate estimation method combines monitoring data of the wind speed and direction sensor and the temperature and humidity sensor, can inhibit the influence of uncertainty of wind flow speed and diffusion coefficient on results after adding noise meeting practical situations into the wind flow speed and the diffusion coefficient, and can acquire the internal gas concentration distribution inside the utility tunnel and meanwhile accurately perform inverse estimation on the gas pipe leakage rate, thereby well meeting the practical situations.

Description

technical field [0001] The invention belongs to the field of urban public safety, and in particular relates to a method for predicting and correcting the gas pipeline leakage diffusion concentration field and estimating the leakage rate in a comprehensive pipeline corridor cabin. Background technique [0002] The urban underground comprehensive pipe gallery integrates all kinds of public pipelines installed on the ground, underground or overhead, makes full use of the urban underground space, avoids repeated excavation of the road surface, ensures the full play of road traffic functions, and creates Good living environment for citizens. The construction of comprehensive pipe gallery plays an important role in making full use of underground space, saving investment, stimulating economic development, changing the appearance of the city, and ensuring urban safety. But at the same time, the occurrence of one type of disaster in the utility tunnel may lead to the occurrence of o...

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Problems solved by technology

But at the same time, the occurrence of one type of disaster in the utility tunnel may lead to the occurrence of other types of disasters, causing greater harm, especially the leakage of gas pipelines in the utility tunnel may lead to accidents such as suffocation, casualties and explosions, and may cause A series of secondary disasters pose a huge threat to the safe operation of the city and the lives of citizens

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