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Natural recovery method for severely-polluted river channel

A natural restoration, river channel technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as polluted river channels, increase dissolved oxygen content, and improve water self-purification ability Effect

Active Publication Date: 2019-06-04
CHANGAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the present invention provides a natural recovery method for seriously polluted rivers to solve the defects existing in existing river projects

Method used

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  • Natural recovery method for severely-polluted river channel
  • Natural recovery method for severely-polluted river channel
  • Natural recovery method for severely-polluted river channel

Examples

Experimental program
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Effect test

Embodiment 1

[0059] Such as figure 1 As shown, a natural restoration method for severely polluted rivers redesigns the structure of heavily polluted rivers according to the parameters of unpolluted upstream or nearby unpolluted rivers.

[0060] The heavily polluted river course after treatment includes the rapids section 1, the deep pool section 2, and the river beach wetland 3. The treated river section is straight as a whole, and the main channel of the treated river section is meandering. The rapids section 1 is arranged on the concave or convex bank of the river beach wetland 3, and the deep pool section 2 is often arranged at the junction of two adjacent concave banks and convex banks. The length of the rapids section 1 and the deep pool section 2 is the same, and the specific length is based on the actual The conditions are determined.

[0061] see figure 2 , the rapids section 1 is set as a trapezoidal section, the slope on both sides is usually 1:1.5-1:2.0, and the bottom prote...

Embodiment 2

[0070] Taking the Bahe River in Xi'an as an example, the length of the remediation river section is 760m, the average slope is 0.567%, and the drainage area above the project area is 518km 2 , according to the "Flood Control Standards", the engineering level of this river section is that the design flood standard is once in 20 years. According to the "Xi'an Practical Hydrology Handbook", the design flood peak discharge Q20=25.06F^0.465=438m 3 / s. According to the project layout, 30 typical compound sections were selected, and the hydraulic calculation of the river channel was carried out through the hecras software to determine the water depth and flow velocity of each section, which was used as the basis for the design of the river channel protection project; while maintaining the stability of the rapids-deep pool-river beach system, In order to achieve good ecological benefits, ecological protection projects such as plant slope protection and riprap foot protection are adopt...

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Abstract

The invention provides a natural recovery method of a severely-polluted river channel, the method comprises the following steps: firstly, selecting a light polluted river channel which is at the upstream of a seriously-polluted artificial interference river channel as a reference, measuring parameters of a plurality of emergency flows, deep pools and river beaches in the light-polluted river channel, and obtaining proportional relation parameters of the area, the perimeter, the length, the width and the slope drop of the emergency flows, deep pools and river beaches in the light-polluted riverchannel; designing the emergency flows, deep pools and river beaches for the severely-polluted river channel, arranging block stones in the emergency flow parts to increase the turbulent flow processof a water flow, increase the dissolved oxygen content of the water body, and protecting a river bed from being scoured during the flood period; expanding the cross sections of an original main tankto form deep pools so as to settling, digesting and biodegrading pollutants; and transforming the river beaches into wetlands, and performing vegetation recovery to increase the effects of pollutant absorption, silt hanging and precipitation of plant branches and leaves and root systems. A series of systems of the emergency flows, the deep pools and the river beaches are restored in a river, and when the polluted water body flows through the systems, a series of physical, chemical and biological reactions are carried out, so that the self-cleaning capacity of the water body is improved.

Description

technical field [0001] The invention relates to the technical field of river channel management, in particular to a natural recovery method for severely polluted river channels. Background technique [0002] With the acceleration of urbanization, urban construction occupies the river, reducing the space of the river, narrowing the water area, and reducing the flood drainage capacity; and the lag in the treatment of industrial sewage and domestic sewage has caused a large amount of sewage to enter the river, and the water quality has generally deteriorated. At the same time, urbanization has also increased surface runoff, resulting in frequent flood disasters. In order to resist these disasters, the traditional method is to heighten and thicken the embankment protection bank, build concrete river beds and masonry stone bank walls to increase the flow capacity of the river channel and isolate sewage seepage; To increase the flood carrying capacity of the river. However, chan...

Claims

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Application Information

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IPC IPC(8): C02F9/14
CPCY02A20/402
Inventor 王震洪陈骎黄鹏华宫晓鑫刘啸宇刘阳
Owner CHANGAN UNIV
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