A laminated anti-evaporation and water-retaining film

Abstract

The invention discloses a laminated covering film water retention device. The laminated covering film water retention device is characterized in that the surface of a water area is covered with two laminated covering films which are insoluble in water, are provided with a lot of through holes and can move oppositely, and the specific weight of the two laminated covering films is smaller than one. The upper covering film of the two covering films is an overall covering film formed in a composite mode by sandwiching a material gridding small in thermal expansion coefficient into two material films large in thermal expansion coefficient, so that the upper covering film is large in thermal expansion coefficient; the lower covering film is small in thermal expansion coefficient and good in heat-insulating property. A hook and loop fastener mode that small pieces of films are fastened piece by piece to form the large pieces of covering films is adopted for the covering films. After the water area is covered with the covering films, water only evaporates through the parts with the through holes. During the drought at the high temperature, the upper covering film expands with heat so that film holes in the upper covering film can shrink to reduce evaporation amount. When the temperature drops on a rainy day, the film holes in the upper covering film and the lower covering film expand so that rainwater can pass through the film holes smoothly to flow into the water area. The covering film is provided with the countless through holes to ensure gas exchange in the water area. The laminated covering film water retention device is simple in structure, low in cost and capable of effectively reducing the evaporation amount of water to play a role in water retention and protection against drought.

Description

Technical field [0001] The invention relates to the field of water conservation and water conservation in water areas, in particular to a laminated anti-evaporation and water conservation film covering the surface of the water area to prevent water from evaporating. Background technique [0002] Due to the differentiation of climatic and hydrological processes, precipitation and evaporation in various regions on the earth are not balanced. Simply put, when the evaporation exceeds the precipitation, a "water-deficient dry area" is formed, and vice versa, a "water-rich humid area" is formed. There are many countries and regions with drought and water shortage in the world, and our country is also a country with severe water shortage. my country's arid and semi-arid regions are vast, accounting for about 51% of the total land area. The climate in arid areas is generally dry and hot, with large water evaporation. Studies have shown that the natural precipitation in my country's Lo...

AI Technical Summary

Problems solved by technology

However, after the project is fully put into use, it will cause huge loss of water resources due to evaporation during the water distribution journey.

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