Method for performing ecological restoration of hardened river banks by mangrove forest plants

Abstract

The invention discloses a method for performing ecological restoration of hardened river banks by mangrove forest plants. The method comprises the following steps: removing concrete hard banks on two sides of a river channel, and protecting the banks by adopting gabion retaining walls; driving tightly arranged pine piles into a riverbed, 2-3 m away from the banks, on the inner sides of the gabion retaining walls, and filling the area defined by the pine piles and the river banks with soil to form a first beach face; in a river section with a wider river channel cross section and a lower flow speed, forming a stepped slope according to terrains; planting true mangrove plants on the first beach face; and planting the true mangrove plants and semi-mangrove plants sequentially from the near-water side to the near-shore side. According to the method, the maximum water passing amount of the cross section is increased by removing the concrete river banks and adopting the terrain design of the gabion retaining walls and the stepped slope, and the flood discharging function is enhanced. The mangrove forest plants are planted on the two sides of the river, formation of different types of habitats such as the river, mangrove forests and semi-mangrove forests is promoted, various water pollution indexes such as ammonia nitrogen, COD (chemical oxygen demand) and the like are obviously reduced, and DO (dissolved oxygen) is obviously increased.

Description

Technical field [0001] The present invention belongs to the technical field of water quality processing channel, and more particularly, to a method for using a mangrove hardened banks of ecological restoration. Background technique [0002] In recent decades, the need for flood control, some of the South China coastal city near the mouth of the river to take a "smooth on both sides" or "three light" hydraulic engineering control measures. The hardening of the river bank, directly block the water and soil (land) substances of biological exchange, undermining survive and multiply space riparian and surface interlaced with biological, reducing species diversity, reduced self-purification capacity of the river . [0003] Mangrove known as "Coast Guard", "Outback Pioneer made" and "natural filter," said, plays an extremely important role in purifying water, wind and wave dissipation, maintaining biodiversity, carbon sequestration and carbon storage. But how to build ecological restora...

AI Technical Summary

Problems solved by technology

The hardening of the river bank directly blocks the material and biological exchange between the water body and the soil (land), destroys the survival and reproduction space of the riparian biological zone and the aquatic and land ecotone, reduces species diversity, and reduces the self-purification ability of the river.

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