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A Natural Restoration Method for Seriously Polluted River Courses

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: 2022-01-25
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A Natural Restoration Method for Seriously Polluted River Courses
  • A Natural Restoration Method for Seriously Polluted River Courses
  • A Natural Restoration Method for Seriously Polluted River Courses

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

A natural recovery method of a heavily polluted river provided by the present invention, first selects a lightly polluted river upstream of the heavily polluted and artificially disturbed river as a reference, measures the parameters of multiple rapids, deep pools and river beaches in the lightly polluted river, and obtains lightly polluted rivers. The proportional relationship parameters of the area, perimeter, length, width and slope drop of the rapids, seepage pools and riverbanks of the polluted river course. Then, according to these parameters, design rapids, deep pools and river beaches for seriously polluted rivers, and lay stones in the rapids to increase the turbulent flow process of the water flow, increase the dissolved oxygen content of the water body, and protect the riverbed from flooding at the same time; the original main channel The cross-section is expanded to form a deep pool, which allows pollutants to settle, digest and biodegrade; the river beach is transformed into a wetland, and through vegetation restoration, the functions of plant branches, leaves and roots to absorb, hang silt, and precipitate pollutants are increased. By restoring a series of rapids-deep pool-beach systems in the river, a series of physical, chemical and biological reactions will occur when the polluted water flows through these systems, and the self-purification ability of the water body will be 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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Patent Type & Authority Patents(China)
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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