Estimation Of Water Leakage In Water Supply Network Based On 3D Hydrodynamic Model

The leakage frequency of urban water supply network is increasing day by day,which wastes a lot of water resources.Water supply enterprises can master the leakage situation of water supply network by estimating the leakage amount of water supply network,and make clear the focus of leakage control work.Moreover,the estimation results will also play an important role in guiding the economic benefit evaluation and subsequent index verification of enterprises.Therefore,this paper constructs the water leakage estimation method of water supply network based on three-dimensional hydrodynamic model to provide the basis for water supply enterprises to evaluate the water leakage of water supply network(1)Based on the three-dimensional hydrodynamic model,the water leakage estimation method of water supply network is constructed.The hydraulic model of one-dimensional water supply network is coupled with three-dimensional hydrodynamic model,and the dynamic pressure data at the leakage and the parameters of the leakage pipeline and the leakage are obtained by using the hydraulic model of one-dimensional water supply network.Then the three-dimensional hydrodynamic model of the leakage pipeline is constructed,and the unsteady flow simulation is carried out by using the two-way fluid structure coupling analysis method,and the leakage water produced by the leakage under the dynamic pressure is obtained.Because the model uses the actual dynamic pressure data at the leakage and takes into account the influence of the leakage area change on the leakage water under the dynamic pressure,the estimation result of this method is more accurate than the existing estimation methods.(2)Analysis of water leakage of water supply network in a study area.It is found that the estimated result is 20% more than that of the conventional method.At the same time,in order to further study the impact of user water use mode on the leakage water,the leakage water generated by the leakage under the new community,old community,industrial,school and commercial user water use mode is estimated.It is found that the user water use mode coefficient is negatively correlated with the leakage pressure and leakage flow,and the relationship between the water use mode coefficient and the leakage pressure and leakage flow is obtained by fitting The relationship between loss of flow.(3)Research on index model modification of water supply network.Taking the ductile iron pipe commonly used in water supply network as an example,through single factor analysis,it is found that the influencing factors of index model parameters are leakage failure form and leakage area;then through three-dimensional hydrodynamic model,the index model parameters of different leakage area under three kinds of leakage failure form are obtained,and the specific table between leakage index,leakage coefficient and leakage area is obtained by fitting All the expressions have good goodness of fit,and then the exponential model is modified.Compared with the existing leakage model,the modified exponential model takes into account the influence of leakage parameters and leakage pressure on the leakage flow,and defines the values of parameters under each leakage condition.It is proved that the modified exponential model can be used as a simplified alternative method of onedimensional water supply network hydraulic model coupled with three-dimensional hydrodynamic model to estimate the leakage of water supply network,which makes the evaluation of water loss more convenient.