Urban rainwater runoff regulation and control method based on LID measures

Abstract

The invention discloses an urban rainwater runoff regulation and control method based on LID measures. The method comprises the steps that 1, a Lagrange interpolation method is used for obtaining a runoff coefficient before development; an LID control editing module in a rainstorm management model is utilized for obtaining the parameter value range of the LID measures; parameters of a surface layer, a pavement layer, a soil layer, a water storage layer and a closed conduit are adjusted according to design requirements; 2, sub-catchment areas are divided, a first-level catchment area with a main river as the center is formed, a second-level catchment area is divided according to a refined DEM graph, and a third-level catchment area is formed according to the distribution condition of drainage facility space; 3, hydrological process simulation is executed; and 4, hydraulic process simulation is executed.

Description

technical field [0001] The invention relates to rainwater management technology, in particular to a method for controlling urban rainwater runoff based on Low Impact Development (LID) measures. Background technique [0002] At present, the rainwater drainage system of most cities in my country is constructed according to the traditional rainwater drainage design method. The traditional urban rainwater drainage design mostly adopts the method of quickly discharging rainwater, which ensures the safety of the urban rainwater drainage system in a short period of time. However, with the improvement of urbanization level, the proportion of urban impervious area increases year by year, and the return period level under the traditional design method can no longer meet the rainwater drainage demand of modern cities. Especially when heavy rainstorms occur, the lack of effective and timely drainage methods for the large amount of rainwater collected in a short period of time is the ro...

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Problems solved by technology

First, the design and construction standards of basic municipal projects such as drainage pipe networks are generally low. At present, the drainage standards of cities above the provincial capital in my country are generally only once a year and once every two years, and the drainage standards of other cities are even lower; second, In recent years, my country's urbanization process has accelerated significantly, followed by the rapid expansion of cities. With the expansion of urban areas, housing construction has become more dense, and the impermeable area covered by concrete has continued to increase, while surface vegetation and ponds have continued to decrease. , leading to the weakening of surface water holding capacity, water stagnation and infiltration capacity, shortening the time of temporary production and confluence of rainstorms, increasing surface and river runoff, and aggravating waterlogging disasters; thirdly, the current urban drainage system only focuses on draining rainwater resources as soon as possible , without considering the non-point source pollution control of rainwater and the utilization of rainwater resources

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