Ecological multidimensional retention system for rainwater drainage on bank side of river

Abstract

The invention discloses an ecological multidimensional retention system for rainwater drainage on a bank side of a river. A primary ecological buffer zone, a first-layer ecological retention system, a second-layer ecological retention system, a third-layer ecological retention system and a secondary ecological buffer zone are orderly arranged on the upstream side of a river embankment along the slope of the bank side; the three layers of ecological retention systems are in concentric semi-annular radial form and of ditch type structures; each ecological retention system is provided with a planting soil layer, a packing layer and a gravel layer, and plants good in stress resistance and prosperous in root system are planted on the ecological retention system; herbaceous plants are planted in the two ecological buffer zones. The ecological multidimensional retention system is capable of reducing the pollution load due to the fact that rainwater runoff is directly discharged into receiving water by use of the retention spaces; due to closure and adsorption by use of a filter material and purification of rainwater runoff pollution by use of the plant root system, partial heavy metal ions, pathogens and the like can be removed; the ecological multidimensional retention system is suitable for any rainwater volume and water quality and has a good landscape effect.

Description

technical field [0001] The invention relates to a treatment facility for rainwater drainage in urban rivers, in particular to an ecological multi-dimensional retention system that can control and purify the drainage at the end of urban rainwater pipe networks. Background technique [0002] In recent years, with the acceleration of urbanization, the scale of cities has continued to expand, and high-intensity human activities have changed land use patterns. A considerable proportion of soft permeable underlying surfaces has been covered by impermeable surfaces, and rainwater runoff has increased. The traditional urban drainage system design is based on the removal of rainwater as soon as possible. This design method has many disadvantages. Rainwater runoff pollution in most cities in my country is relatively serious, and surface runoff is directly discharged into receiving water bodies through outfalls on the banks of urban rivers, which has become an important factor in the d...

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Problems solved by technology

[0007] Most of the existing detention systems come from LID and BMPs, which are used in roadsides and gardens, etc., but the layout is too traditional and single, the water passing effect is poor, and the processing capacity is insufficient. If the design is not reasonable, no one will take care of it after long-term use. As a result, the filler is easy to block and harden, and the plants are abandoned, which fails to achieve the desired effect when developing LID and BMPs, and it is rare to see the retention system applied to the river bank to control rainwater drainage, collect rainwater and natural rainfall

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