Ecological check dam prevention and control system for three gorges reservoir region hilly land ravine agricultural non-point source pollution

Abstract

The invention relates to the fields of environmental engineering and ecological engineering. An ecological check dam prevention and control system for three gorges reservoir region hilly land ravine agricultural non-point source pollution is characterized in that multiple levels of ecological check dams are in trapezoidal distribution with natural fall from high to low along with the hilly land; each level of ecological check dam consists of a water storage regulating pond, a constructed wetland and a check dam main body, which are arranged sequentially according to the water flow direction; the water storage regulating pond is communicated with an overflow port in the previous level of the check dam main body. The system can effectively intercept and control the hilly land ravine agricultural non-point source pollution of the drainage basin, can reduce water and soil loss, can perform water-harvest irrigation, can reduce attenuation of channel nutrients before and after rainfall on sloping fields, and can realize ecological interception of agricultural non-point source pollutants.

Description

technical field [0001] The invention relates to the fields of environmental engineering and ecological engineering, and in particular to a multi-level wetland and valley workshop ecological resistance control technology system that collects and stores rainwater and intercepts and purifies agricultural non-point sources of N, P and soil erosion on hillsides in river basins. Background technique [0002] After the water storage and operation of the Three Gorges Reservoir, the water quality of its main stream is stable, while the water quality of secondary rivers in the backwater area has declined, and some tributaries have already appeared "algae bloom". With the strengthening of full prevention and control of point source pollution, the impact of non-point source pollution, especially agricultural non-point source pollution, has become increasingly prominent. In recent years, agricultural non-point source pollution in the Three Gorges Reservoir area has shown a worsening tren...

AI Technical Summary

Problems solved by technology

However, when dealing with agricultural non-point source pollution on mountain slopes in rainy climates in the south, it is often due to the large slope of the slopes in the watershed, large runoff flow and fast flow rate, and soft and high soil composition, resulting in high sediment and N and P contents in the valleys and gullies, which cannot be solved. Form a microbial and aquatic plant system that can absorb and degrade nutrients such as N and P in the influent water

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