Compound river channel system

Abstract

The invention discloses a compound river channel system. The system comprises a main river channel, revetments disposed on both sides of the main river channel and at least one twisty and different-depth ecological river channel in the water flow direction built in the main river channel. The ecological river channel meets the conditions that in the flat water period and the dry water period, theflow rate of the river main stream is greater than or equal to 0.5 m / s. The compound river channel system has a great improvement on water quality, and can upgrade the main nutrient salt indexes of the water quality, such as ammonia nitrogen, total nitrogen, total phosphorus and the like, from inferior V to near class IV and above; the river channel can store water in the flat water period and thedry water period and conduct flood discharge during the rainy season to enhance the flood control capacity of the river.

Description

Technical field [0001] The invention relates to the technical field of environmental engineering, in particular to a compound channel system. Background technique [0002] In traditional river improvement projects, the water conservancy and flood control functions of the river are usually emphasized one-sidedly, and a single section with good water delivery performance and easy construction is usually adopted on the cross section, such as trapezoid and rectangular, which makes the hydraulic conditions of the water flow uniform. During normal and dry periods, the water flow in the river is limited to part of the river bed space, resulting in a large area of ​​the river bed being exposed, and the landscape and functionality of the water body are greatly reduced. In addition, for river improvement projects, such as sediment dredging, improvement projects such as cutting bends and straightening and river bottom hardening are usually adopted. These engineering measures have changed th...

AI Technical Summary

Problems solved by technology

[0002] In traditional river improvement projects, the water conservancy and flood control functions of the river are usually one-sidedly emphasized. On the cross section, a single section with good water transfer performance and convenient construction is usually used, such as trapezoidal and rectangular, which makes the hydraulic conditions of the water flow uniform. During the flat water season and the dry season, the water flow in the river channel is limited to a part of the riverbed space, resulting in a wide range of riverbed exposure, and the landscape and functionality of the water body are greatly weakened

In addition, for river channel improvement projects, such as bottom sediment dredging, usually adopts river channel straightening, river bottom hardening and other improvement projects. There are vegetation and other biological communities, which leads to a significant reduction in the self-purification ability of the water body, the water quality tends to deteriorate, and the ecological function of the water body is greatly degraded, which is very unfavorable for the maintenance of the ecological diversity of the water body

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