Strongest Category 16! Guangdong May Face Super Typhoon, Plastic Materials Build a Technological Defense Line in Heavy Rain

According to the China Meteorological Administration's morning forecast on September 24, Zhuan Su Shi Jie this yearTyphoon "Haikui" (No. 18) intensified to typhoon level on the morning of September 20. At 5 a.m., its center was located about 960 kilometers northeast of Manila, Philippines, over the northwestern Pacific Ocean, at a latitude of 16.6 degrees north and a longitude of 129.7 degrees east. The maximum wind force near the center reached level 12 (33 meters per second), with a minimum central pressure of 975 hPa. The radius of the 7-level wind circle is 280 to 320 kilometers, and the radius of the 10-level wind circle is 50 to 60 kilometers.

It is expected that."Huajasha" will move to the northwest at a speed of 10 to 20 kilometers per hour, with intensity increasing to the level of a super typhoon. It will enter the northeastern South China Sea via the Bashi Channel on the 23rd and approach the coastline of South China on the 24th.

"Hagibis" could reach a maximum strength of 16 and may become the "King of Winds" in the South China Sea and Northwest Pacific this year.

Xin Xin, a meteorological analyst at the China Weather Channel, stated thatTyphoon "Haijie" (No. 18) is noticeably larger than Typhoon "Mitag" (No. 17), with its general path moving northwestward. The official forecasts from China and Japan suggest that on the afternoon of the 24th, the typhoon's center may be near the southern coast of the Pearl River Estuary. Currently, the discrepancies in numerical predictions have narrowed, with forecasts from China, Europe, and the United States all indicating that it might make landfall near the Pearl River Estuary later on the evening of the 24th.

From the 19th to the 22nd, the subtropical high on the north side of the typhoon continues to exhibit an east-west zonal distribution, steadily guiding the typhoon westward. From the 23rd to the 24th, the westerly trough in the north moves eastward, directing the cold air to move east and south. The subtropical high weakens and retreats eastward, which may increase the northward component of the typhoon's path, possibly leading to landfall in Guangdong. Thereafter, the typhoon weakens, suppressed by low-level cold air, and the subtropical high extends westward again, potentially guiding the typhoon westward, possibly skirting along the western coast of Guangdong.

A low-pressure system is moving southward from the 23rd to the 24th, and the typhoon itself is also very strong. This situation could trigger extremely strong winds and rain. Additionally, the outer side of the typhoon may also generate squall lines, and localized tornadoes cannot be ruled out.

In this battle against nature, flood control and disaster relief equipment become the first line of defense in protecting lives and property. What is less known is that these pieces of equipment..."Invisible heroes" are often plastic materials represented by polyethylene (PE), ABS, polypropylene (PP), etc. With characteristics such as lightweight, corrosion resistance, and high strength, they play an irreplaceable role in flood control systems.

Flood Control Sandbags: Evolution from Tradition to Technology

Flood control sandbags are the most basic equipment in flood fighting and emergency rescue. Traditional sandbags are mostly made of thick canvas or burlap materials, but they have issues such as easy sand leakage and low density. Modern flood control sandbags, however, incorporate polymer material technology.

Encrypted polyester sandbags: Through special weaving techniques, they enhance sun and corrosion resistance, maintaining structural stability even in acidic and alkaline environments, and preventing sand leakage from clogging drainage systems.
Water-absorbing expandable sandbags: Filled with polymer nano water-absorbing resin, they rapidly expand to several times their original volume upon contact with water, forming a gel-like water barrier. The outer layer is often made of non-woven fabric or burlap material, while the internal reinforcement rope is made of polyethylene.PE) drawing, enhancing the overall pressure resistance of the sandbag with high-strength fiber reinforcement.
In a bank protection project in a certain area of Hebei, the combination of polyethylene woven fabric mat and longitudinal reinforcement rope formed a flexible water-blocking structure that effectively resisted river scouring.

Waterproofing membrane: underground engineering"Plastic Shield"

In flood prevention for underground spaces such as subways and tunnels, plastic waterproof sheets serve as a key barrier. Common types include:

HDPE (High-Density Polyethylene) waterproof board: Known for its excellent puncture resistance and chemical resistance, it is suitable for high water pressure environments. For example, a certain metro line in Shenzhen uses HDPE waterproof boards to construct an underground flood prevention system.
PVC (Polyvinyl Chloride) waterproof board: Achieves a balance between lightweight and waterproof properties through a honeycomb structure design, commonly used in temporary flood control projects.
EVA (Ethylene-Vinyl Acetate) waterproof board: It combines flexibility and sealing properties, maintaining elasticity even in low-temperature environments. It was extensively used in a reinforcement project of a reservoir in Northeast China.
These materials form a continuous waterproof layer through hot melt welding, effectively blocking groundwater infiltration, and their construction efficiency is much higher than that of traditional concrete structures.

ABS Flood Barrier: A Revolution in Modular Flood Protection

Traditional sandbags require a lot of manual stacking, while...ABS flood barrierEngineering plasticsImplement rapid deployment.ABS material combines the heat resistance of acrylonitrile, the toughness of butadiene, and the rigidity of styrene, offering the following advantages:

Efficiency:Ten flood barriers can replace 100 sandbags and can be used to construct a 1-meter-high flood wall within an hour.
Portability: The weight of a single board is insufficient.10 kilograms, assembled in a "building block" manner using special connectors.
Environmental sustainability:ABS is recyclable, preventing soil pollution caused by sandbag residues.

In the 2024 Zhengzhou Metro flood prevention drill, the ABS flood barriers successfully withstood simulated flood impacts, and their design, with sandbags filled at the bottom, further enhanced stability.

Assault boats and lifesaving equipment: the buoyancy and toughness of plastic

PVC assault boat: Made with polyvinyl chloride coated fabric as the core, formed through high-frequency welding technology, it features good air tightness, oil resistance, and easy repair, becoming the standard equipment for rescue teams.
Life jacket lining: made of polyurethane foam orEVA foam material provides no less than 150N of buoyancy, with an outer nylon fabric that remains undamaged after 2000 friction tests.
Drainage pump components: impellers and oil caps are mostly made of polypropylene.PP), its heat resistance (melting point 160℃) and chemical stability ensure the equipment operates for a long time in turbid waters.