Long-term monitoring method for wind-blown sand flow of near surface

Abstract

The invention provides a long-term monitoring method for a wind-blown sand flow of a near surface. A device used in the method consists of an over-ground part and an underground sand storage device, wherein the over-ground part consists of a sand mining device serving as a sand mining machine, a wind-driven steering device and a ground protection ring; and the underground sand storage device consists of a fixed outer barrel and a sand collection box. By the method, the sand mining machine can be driven by wind power to rotate, so that a sand inlet is opposite to wind direction all the time, the transported sand in a range of the same wind direction can be collected in the same sand accumulation box, distortion of observation data caused by wind erosion around the sand mining machine can also be prevented, and a large sand storage space can ensure long-term continuous observation. The method is suitable for long-term fixed point observation of wind-blown sand flow under an outdoor unattended condition, so that outdoor working strength of an observer can be relieved.

Description

technical field [0001] The invention relates to a long-term monitoring method for sand and dust in the atmospheric environment, in particular to a long-term monitoring method for near-surface wind and sand flow. Background technique [0002] The sand flux of near-surface aeolian sand flow is a problem that must be considered in the study of the law of aeolian sand movement and engineering design of sandy areas. The commonly used sand flow monitoring method is the direct capture method, and the tools used are various types of sand collectors. According to the collection principle, sand collectors can be divided into active type and passive type. The active type is mostly used in wind tunnels, while the passive type is widely used because of its convenience. Passive sand collectors have developed many types. The analysis found that they have the following problems: (1) Most of the passive sand collectors have extremely limited sand storage space, which is only suitable for s...

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Problems solved by technology

The analysis found that they have the following problems: (1) Most of the passive sand collectors have extremely limited sand storage space, which is only suitable for short-term observation, and the efficiency of long-term observation sand collection decreases, and the error increases; (2) Some can only collect sand in one direction. The wind-sand flow transports sand, while a small part can collect sand transported in all directions. For the latter, most of them only collect sand transported in various directions to obtain the total sand transported. A very small part can be collected separately according to different wind directions to obtain Sediment load in each direction

However, its aboveground part is cylindrical and has a large volume, which greatly interferes with the wind-sand flow field. At the same time, the sand inlets are evenly arranged from top to bottom, and the lower layer has greater resistance to the wind-sand flow, resulting in increased observation errors.

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