43results about How to "Avoid ecological damage" patented technology

The present invention provides a system and a method for processing and reusing graywater. At least two vertical flow wetland units are provided, each of which comprising a container filled with at least one granular substrate and at least one species of a hygrophilous plant, and an outlet. At least one of the wetland units is set to an inactive state during a predetermined period of time such that influx of graywater to each of the inactive units is prevented, whereby to regenerate each inactive wetland units. At least one of the wetland units is set to an active state to allow introduced graywater to be purified. Purified graywater is discharged from the outlet of each active unit to a sink. At least a portion of the purified graywater is recirculated to each active wetland units so that a portion of the purified graywater, when desired, is discharged to a domestic site for reuse.

The invention discloses a protective structure for preventing and controlling a riverway concave bank from being eroded. The protective structure comprises an overflow weir formed through double-layerinlaying, a protective arm and dam abutments formed by inlaying large dimension stones. The relatively higher protective arm is arranged on the concave bank side prone to erosion of a riverway, and the relatively low overflow weir is arranged at the center of the riverway, so that river water is centralized in the overflow weir and a protection-free convex bank to flow through a river bend, flowing of the river water close to the concave bank is retarded, the shear stress at the concave bank is reduced, silt at the concave bank is prevented from being eroded by the river water, meanwhile water level rise before the overflow weir is quick, a scour pit is formed behind the weir, pressure gradient is formed on a river bed due to water level difference, and surface water and underground waterexchange is promoted. Compared with a traditional method, the protective structure is low in cost and long in service life, can also prevent the concave bank from being eroded, promotes surface waterand underground water exchange, thus improves the self-cleaning capacity of the riverway, relieves riverway pollution and has a wide application prospect in the fields such as channel improvement ofriverway and mountainous area drainage basins.

The invention discloses a BPNN-based method for predicting NDVI in grassland areas in northern China: establishing a BPNN prediction model for monthly average rainfall in future annual growing seasons; establishing a mapping model for monthly average rainfall-NDVI in future annual growing seasons; predicting rainfall using BPNN The monthly average forecasted value of rainfall in the future annual growing season produced by the model is substituted into the rainfall-NDVI mapping model to obtain the monthly average forecasted value of NDVI in the future annual growing season. The present invention can accurately predict the average value of NDVI in the growing season (June-August), thereby realizing the estimation of the livestock quantity (carrying capacity) that can be grazed in future years according to the predicted value of NDVI. grazing strategies to avoid overgrazing in disaster years.

The invention discloses an ecological artificial channel with filtering and electricity generation functions at a downstream position of a reservoir. The ecological artificial channel comprises two rows of river retaining walls respectively arranged in the artificial channel in the river flow direction, the two rows of river retaining walls are respectively arranged close to the two sides of the channel, an inner area between the two rows of the river retaining walls is an inner channel, and an area between one river retaining wall and the corresponding side of the channel is an outer channel; the lower portion of each river retaining wall is provided with water flow holes, the water holes are internally provided with rotary turbines used for electricity generation, and closing valves are arranged at the positions of the water flow holes; one surface, close to the corresponding outer channel, of each river retaining wall, is provided with lifting inserting boards, each lifting inserting board is provided with a filter casing used for filtering mud in water, the inner channel is internally provided with a dirt interception layer, the dirt interception layer is internally provided with water flow through holes, and the upper surface of the dirt interception layer is provided with dirt accumulation areas. Compared with the prior art, the timing reservoir sluicing is utilized by the ecological artificial channel with the filtering and electricity generation functions at the downstream position of the reservoir, so that when the double-layer-design artificial channel is filled with water, the hydroelectric generation is achieved through the utilization of the water level difference by the inner and outer channels; besides, rubbish and foreign matters in a river can be filtered, the water quality is purified, and energy conservation and environment protection are achieved.