Jiang-Huai Hills do not extend to Pacific ocean, leaving a small plain area, north part of Jiangsu province, unprotected. This small area, similar to US Tornado Alley, has annually recurring tornado outbreaks. For example, the city Gaoyou in this area has a nickname "Tornado hometown", which has tornado outbreaks once in two years on average. It is thus clear that Jiang-Huai Hills are extremely effectively in eliminating tornadoes formation. Without Jiang-Huai Hills, a quite big area in China would become "Tornado Hometown"I'm not sure how long these walls are supposed to be, as the mountains in China the press release mentions are between 180 and 500 miles long. I'm also not sure how they took a building that is maybe 200 feet by 200 feet at the base, and 1000 feet tall, and cost $540 million (via wikipedia), and figured that a 5280 feet long, 160 feet wide and 1000 feet tall wall (made of what, I don't know) would cost $160 million. Anyway, even if it were feasible to build three of these across the Great Plains, there will be several hundred miles between them. I'm guessing that gap may be big enough to allow tornadoes to form up. Plus, the wall would seem like a speed bump for continental weather systems. In fact, I would expect a wall to be destroyed by a tornado in the early stages of construction. I think I'll go back to doing some work instead of wasting time trying to fathom how this shit gets published anywhere outside of the Onion.
While there are no mountains in Tornado Alley to play the same role as Jiang-Huai Hills etc in China, there are two small mountains, Ozarks Mountains and Shawnee Hills, which significantly reduce tornado risk for some local areas.
Ozark Mountain consists of high and deeply dissected plateaus; the mountain hills are south-north ranged. Most parts of these north-south hills cannot block or weaken air mass flow between north and south. Therefore, for example, Joplin has very high tornado risk as it faces the north-south deeps and valleys formed by these hills, the winds get more strength as they pass these valleys and deeps. On the other hand, some small sections of St. Francois Mountains and Boston Mountains have the hills east-west connected. Therefore, for example, Rolla, Missouri has very low tornado risk, as analyzed by www.homefact.com/tornadoes/.
The devastating tornado outbreak in Washington County, IL on November 17, 2013 also reminds us about Shawnee Hills, which is a small mountain, 60 miles east from Washington County. Most Shawnee Hills are along the south - north direction, but some sections are east-west connected, located at the south border of Gallatin County. Therefore, Gallatin County has very low tornado risk, although the most land in Gallatin County is flat farm land, same as Washington county.
According to Dr. Tao, the above information learned from Nature is very encouraging. Although there are no east-west mountains in Tornado Alley, we can build some east-west great walls to play the same role. Also learned from Jiang-Huai Hills and Shawnee Hills, the wall needs about 300 meter high and 50 meter wide.
To eliminate the tornado threat for the entire Tornado Alley, we may need to build three great walls. The first one should be close to the northern boundary of the Tornado Alley, maybe in North Dakota. The second one should be in the middle, maybe in the middle of Oklahoma and going to east. The third one can be in the south of Texas and Louisiana.
Such great walls may affect the weather, but their effect on the weather will be minor, as evidenced by Shawnee Hills in Illinois. In fact, with scientific design, we may also use these walls to improve the local climate.
In Philadelphia, there is one skyscraper building, Comcast Center, about 300 meter high. From the cost of Comcast Center, we estimate that to build one mile such wall, we need about $160 million. On the other hand, the damages caused by single tornado attack in Moore, Oklahoma on May 20, 2013 alone were multi billion dollars. Therefore, it seems that the cost for building such a wall is affordable.
While building the three great walls will eventually eliminate major tornadoes in the entire Tornado Alley, we do not expect to start such a huge project in the near future. On the other hand, it is more realistic to build such great walls locally at high tornado risk areas first, then connect them piece by piece. To do so locally, we must remember that from air fluid dynamics, the area protected by the wall is roughly a circle with the wall as its diameter.
Also in developing any new city in Tornado Alley in future, we may consider to build east-west skyscraper buildings first, then allocate the other parts of the city surrounding the skyscraper buildings. In such a way, the skyscraper buildings will serve as a wall, eliminating major tornado formation in their surroundings to protect the whole city.
Thursday, June 26, 2014
Keep Smoking The Crack
In order to disrupt the formation of tornadoes, crazy folks have proposed building three 160 feet wide by 1000 feet high walls across the Great Plains. I'd seen the idea pop up last year, but this was the first time I looked at any numbers: