Generalized calculation method for pipe network drainage process of urban area without pipe network data

Abstract

The invention discloses a generalized calculation method for a pipe network drainage process of an urban area without pipe network data. The generalized calculation method specifically comprises the following steps that the number of blocks of a researched area, the number of catch basins of each block, the distribution positions of the catch basins and the circumferences of the catch basins are measured through actual reconnaissance; the surface water depth of the whole research area by adopting a flood process numerical method is calculated based on an all-hydrodynamic method; the amount ofwater entering the single rainwater well is preliminarily calculated from the earth surface through a weir flow formula, namely the discharge amount of the single rainwater well; the total drainage amount of the rainwater well to which the same block belongs is calculated; according to the pipe diameter and the gradient of the drainage pipeline, the total drainage amount of the same block is limited and corrected, and the corrected drainage amount of a single rainwater well is obtained; all rainwater well drainage amounts of K blocks of the researched area are calculated; and the net rain rateRn of a single rainwater well is calculated on the earth surface unit at the position of the rainwater well. According to the invention, the simulation precision of the urban flood process without pipe network data can be improved.

Description

technical field [0001] The invention belongs to the technical field of municipal water supply and drainage and urban water disaster prevention, and relates to a generalized calculation method for the process of pipe network drainage in urban areas without pipe network data. Background technique [0002] Urban floods are surface water accumulations caused by heavy rainfall, floods from outer rivers and tidal water jacking, insufficient urban flood storage capacity, and poor drainage. The phenomenon of water accumulation in the drainage system. With the impact of global climate change and urban "heat island effect", repeated torrential rains and torrential rains have caused adverse effects on the normal operation of urban drainage systems, causing urban waterlogging, seriously affecting the orderly operation of cities, and causing The probability of cities suffering from natural disasters has increased dramatically. In order to alleviate the increasingly serious problem of u...

AI Technical Summary

Problems solved by technology

However, in some urban areas, especially in old urban areas, it is extremely difficult to obtain complete drainage pipe network data, mainly because urban pipe network data are often lost due to age, and the original pipe network data was not even preserved at the beginning; sometimes even There are pipeline network design drawings, but due to the large number of design units and the difficulty of coordination during the construction period, there are a large number of cross-connections between pipelines, and there will be problems of inconsistency between the actual layout and the design drawings; the actual pipeline network in some areas has not been cleaned up in time due to long-term operation In the event of pipe network blockage, there will also be

In recent years, pipeline drones can be used to actually measure the layout of pipeline networks, but this method is costly and inefficient, and it is difficult for general projects to afford large-scale actual pipeline network measurements

In addition, it is difficult to establish a pipe network model in a large-scale pipe network dense area

Images