An emergency calibration device and method for the dielectric constant of ice-plugged ice dams and subglacial water bodies

Abstract

The invention relates to an emergency calibration device and method for dielectric constant of an ice berg ice dam and a water body under ice. The device comprises an upstream water tank and a downstream return pool. A non-metal water tank is connected between the upstream water tank and the downstream return pool. An ice adding device, at least two measuring platforms for placing a radar and a water-permeable ice blocking plate are arranged in order in the water tank. Each measuring platform comprises a radar platform parallel to the water surface and capable of moving up and down, and a horizontal gauze capable of lifting and lowering is directly below the radar platforms. According to the invention, rapid physical simulation simulating flow ice experiments is established in a laboratoryunder hydrodynamic conditions, riverbed boundary conditions and upstream ice conditions in the reach of the ice berg ice dam; corresponding basic data such as dielectric constant of the ice berg icedam and the water body under ice are provided in two hours, and a drone calculates the thickness of the ice berg ice dam after on-site measurement; a decision to deal with the ice berg ice dam is quickly made; and disaster losses caused by the ice berg ice dam are minimized.

Description

technical field [0001] The invention relates to an emergency calibration device and method for the dielectric constant of ice plug ice dams and subglacial water bodies, an emergency test device and method for disaster prevention and mitigation, and a physical simulation method for simulating disaster-prone areas. Device and method for calibrating dielectric constant by blocking ice dams on rivers. Background technique [0002] After winter, the temperature drops, the water body loses heat, and when the water temperature drops below 0°C, ice flakes will appear in the river channel, and then drift ice will appear. Affected by water flow conditions, topographical conditions, and wind direction, drift ice will accumulate on each other to form an ice sheet. When the water flow velocity is small, the thickness of the ice sheet is mainly controlled by the thickness of a single drift ice, and the drift ice is arranged in sequence to freeze each other, forming a "flat seal"; when th...

AI Technical Summary

Problems solved by technology

In addition, among the water transfer projects, there are problems such as ice plugs and ice dams in the Yellow River Diversion Project, Yellow River Diversion Project, and South-to-North Water Diversion Middle Route Project, which affect the safe water supply in winter

For example, during the winter water transfer of the Yellow River to Tianjin in 2010, the Xiaowangzhuang Pumping Station blocked the water flow due to ice blocking the trash rack, causing all units to be shut down

On January 29, 2008, an ice dam was formed at the entrance of the inverted siphon in a short period of time in the project of diverting the Yellow River to the Dian River, which blocked the inverted siphon and caused a dangerous ice jam

However, due to the characteristics of multiple voids, irregularities, and unstable structural strength of ice-plugged ice dams, it is very difficult to drill holes in the artificial ice surface, and even life-threatening, and some large-scale ice-plugged ice dams stretch for tens of kilometers in length , the thickness exceeds 3m, and the possibility of measuring by manual punching is almost zero

[0005] With the development of radar technology, the technology of non-contact measurement of ice-plugged ice dams by radar is becoming more and more mature. It is possible to measure ice-plugged ice dams in the air by using drones to mount radars. The dielectric constant of water has a great influence. If the dielectric constant is used improperly, it will cause a large error in the measurement.

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