Horizontal and vertical combined underdrainage device for improving interlayer soil of coastal mud flat reclamation area farmland and drainage method thereof

Abstract

The invention provides a horizontal and vertical combined underdrainage device for improving interlayer soil of coastal mud flat reclamation area farmland. According to the device, coastal mud flat saline-alkaline land is provided with salt leaching channels, drainage bodies, concealed water flow collection and water suction conduits and open drainage ditches. The concealed water flow collection and water suction conduits are buried under the coastal mud flat saline-alkaline land according to the line spacing of 17-25 meters. The salt leaching channels are respectively provided with a vertical shaft every 4-6 meters in the length direction of the concealed water flow collection and water suction conduits, and the drainage bodies are arranged in the vertical shafts. The water inlet ends of the concealed water flow collection and water suction conduits are higher than the water outlet ends of the concealed water flow collection and water suction conduits, and the water outlet ends are connected with the open drainage ditches. The invention further provides a combined drainage method. According to the method, salt in the soil of the coastal mud flat saline-alkaline land is leached and flows into the vertical shaft type salt leaching channels along with water flow, and the concealed water flow collection and water suction conduits collect the water flow in the salt leaching channels and guide the water flow into the open drainage ditches. The device has the advantages of being reasonable in structure, convenient to construct and install, low in cost, short in improvement period, fast in effect, capable of being widely applied and popularized in the areas with the irrigation and drainage conditions and especially suitable for improving the highly-saline soil of the coastal mud flat reclamation area.

Description

technical field [0001] The invention relates to a horizontal and vertical combined underground drainage device and a drainage method for improving farmland interlayer soil in a beach reclamation area. Background technique [0002] my country's coastline is long and the proportion of plain coast is large, while the coastal soil contains more saline-alkali components, and its poor physical and chemical properties cause the growth of most plants to be inhibited to varying degrees, or even unable to survive. Coastal tidal flat reclamation areas are mostly formed by reclamation from the sea. In order to accelerate the formation of tidal flats, dikes and dams are even filled with soil in stages. Therefore, due to the long time of soil formation and the large differences in soil materials in different periods, it is easy to form layers with greater differences in drainage characteristics. The soil, including the sandwich soil layer with poor water permeability, has caused serious o...

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Problems solved by technology

Coastal tidal flat reclamation areas are mostly formed by land reclamation. In order to accelerate the formation of tidal flats, the method of building dams and filling soil in stages is adopted. Therefore, due to the long time of soil formation and the large difference in soil materials in different periods, it is easy to form layers with greater differences in drainage characteristics. Soil, the sandwich soil layer with poor water permeability has caused serious obstacles to farmland drainage and saline-alkali land management in the reclamation area

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