Design method of underflow manual wetland matrix structure based on flow field distribution

Abstract

The invention discloses a design method of an underflow manual wetland matrix structure based on flow field distribution. The method performs quantification design on main structural parameters influencing underflow manual wetland flow field distribution based on a seepage field theory, taking uniform distribution of a water flow around a bed body as a purpose, and taking a three-dimensional finite difference underground water flowing mathematical model as a design calculation basis, wherein the main structural parameters include manual wetland unit division, unit pond body length-width ratios, water distribution area length, water collection area length, bed body depth, filling layers of a main body filler area, and filler permeability coefficients; matrix fillers are measured by a Darcy permeability test; the fillers with required particle size are screened out. When the design method performs design calculation on the structural parameters of underflow manual wetland, the selection of the structural parameters is simple, convenient and practicable; the underflow manual wetland constructed according to the design method can greatly improve and increase the hydraulic efficiency of a system and utilization ratios of the fillers, can avoid a channel flow, a short flow and a dead area, and can further improve and prolong a purifying effect and the service life.

Description

technical field [0001] The invention belongs to an innovative design of subsurface flow constructed wetland matrix structure, in particular to a design method of subsurface flow constructed wetland matrix structure based on flow field distribution. Background technique [0002] In today's increasingly severe water pollution and water resource shortage, artificial wetland technology as an ecological treatment method has a broad space for development. Constructed wetlands can be divided into subsurface flow constructed wetlands, vertical flow constructed wetlands and surface flow constructed wetlands according to the water flow state. Among them, subsurface flow constructed wetlands are the most widely used. Compared with traditional biochemical treatment methods, they have low treatment costs, simple management, The treatment effect is good, and it is not easy to cause environmental sanitation problems. [0003] In recent years, with the gradual expansion of the application ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a subsurface flow constructed wetland matrix structure design method based on the flow field distribution, quantify the subsurface flow constructed wetland bed structure parameters according to the seepage theory, and solve the problems in the design and construction of the subsurface flow constructed wetland. Arbitrary and empirical problems to ensure the uniformity of the flow field distribution inside the matrix

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