A trip to Weihai —— Reading "Rapids"

On August 18, 10, my mother and my best friend made an appointment to take us to Weihai for a short trip for three days.

Weihai is located at the eastern end of Shandong Peninsula, 36 465 438+0 ′ ~ 37 35 ′ north latitude and 65 438+0165 438+0 ′ ~ 65 438+022 42 ′ east longitude. It is bordered by the Yellow Sea in the north and southeast, Liaodong Peninsula in the north, Korea Peninsula and Japan Islands across the sea in the east and southeast, and Yantai City in the west. The maximum horizontal distance from east to west is 135km, and the maximum vertical distance from north to south is 8 1km, with a total area of 5435km2, including 73 1km2 in the urban area. The coastline is 985.9 kilometers long.

Clear sea water, delicate beaches, people who like to live slowly.

What I want to talk about is the "scourge" under the surface calm-the deadly "rip flow".

Rip current is a narrow and strong flow like a light beam, which flows outward in a direction perpendicular or nearly perpendicular to the coast. Its width is generally not more than 10 meter, and its length is generally between 30 and 50 meters, and some are as long as 700 to 800 meters. Although this water flow is not long, it is very fast, the flow rate can be as high as more than 2 meters per second, and each water flow lasts for two or three minutes or even longer. Rip current is also called rollback stream.

pretend

Riptide is often hidden under the sparkling sea surface, which becomes the biggest danger of bathing beach.

sudden

Rip current will suddenly appear when people are unprepared.

Tearing flow can occur in any weather condition, and it will appear on many types of beaches. Unlike waves that make a lot of noise due to violent impact, rip current will not attract people's attention until people are trapped in it.

unpredictability

Due to the influence of waves, tides, astronomy, wind direction and many other factors, the intensity and state of fissure flow are unpredictable. It has huge energy, and sometimes even the lifeboats on the sea will be swallowed up, so once it encounters rapids, it will be very dangerous. The neck is the most dangerous place, which is not only narrow but also fast, and the negative pressure generated by high speed will "suck" the approaching swimmer in.

Although this trip is short and safe, I still want to warn you with my geographical knowledge that you must do your homework in advance, understand the local climate, geographical environment and traffic conditions, and always pay attention to safety.

20 17 Gao Tongyu, Class Two