Landscape hydraulic drop structure with seasonal stream water quality improvement function

Abstract

The invention discloses a landscape hydraulic drop structure with a seasonal stream water quality improvement function. The landscape hydraulic drop structure comprises a C-shaped cofferdam constructed at the hydraulic drop position of a watercourse, the top of the C-shaped cofferdam is flush with a flood stage line of the watercourse, the bottom of the C-shaped cofferdam is lower than a dry season low water level line by 5-10 cm, and steps with descending grade from 15 degrees to 45 degrees are arranged on the inner side of the C-shaped cofferdam. A plurality of first water outlets are arranged in the steps in the middle height, the lower portions of the steps extend inwards to form a stepped arc-shaped short cofferdam, a plurality of second water outlets are arranged in the arc-shaped short cofferdam, the top of the arc-shaped short cofferdam is higher than the bottom of the C-shaped cofferdam by 0.5-1.0m, a pond is enclosed by the arc-shaped short cofferdam and the steps in the middle of the C-shaped cofferdam, emergent aquatic plants are planted in the pond, and constructed wetland padding matrixes are paved at the bottom of the pond. The landscape hydraulic drop structure with the seasonal stream water quality improvement function can be flexibly adapt to periodic and seasonal fluctuation of water-carrying capacity and enable constructed wetlands to be suitable for being arranged in the watercourse, saves land, reduces pump station facilities and power consumption, is capable of being suitable for different water levels of the watercourse, and enables water quality to be purified and improved.

Description

technical field [0001] The invention relates to the field of river landscape ecological restoration design, in particular to a landscape water drop structure, Background technique [0002] Seasonal rivers generally undertake three functions of drainage, landscape and ecology in cities, and the water quality in the river is the basis for ensuring their functions. Since the water volume and flow state of seasonal rivers vary greatly between dry and wet seasons, and water quality is affected by non-point source pollution, it has always been difficult to coordinate flood control, landscape, and water quality to plan and design seasonal rivers. In recent years, there are three conventional design methods for river water quality improvement: one is to design a constructed wetland treatment system around the riverbed of the river, and set up pumping stations to introduce river water into the constructed wetland, and then flow it back into the riverbed after purification. The secon...

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Problems solved by technology

[0003] The design methods for improving the water quality of these rivers have the following defects: the artificial wetland treatment system needs to occupy the land next to the river or may be washed away during the flood period, and the establishment of pumping stations needs to consume electric energy; due to the small rainfall and runoff of seasonal rivers during the dry season, Designing drop dams or rubber dams to aerate rivers will not improve water quality

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