Grand canal in yuan dynasty
From the Sui and Tang Dynasties to the Song Dynasty, the Grand Canal was a north-south communication line centered on the metropolis. After the repair of Huitong River and Tonghui River in Yuan Dynasty, it became a new type of canal with metropolis as the center. It is the predecessor of today's Beijing-Hangzhou Grand Canal.
After the national political center moved to Beijing in Yuan Dynasty, in order to shorten the route from Beijing to Hangzhou to bypass Luoyang, Tonghui River from Beijing to Tongxian, Huitong River from Linqing, Shandong, and Jeju River from Dongping to Jining were successively dug, 1283 ~ 1293. After the canal was changed into a straight line, it was shortened by more than 900 kilometers compared with the Beijing-Hangzhou Canal in Sui Dynasty.
The northernmost section of the Grand Canal in the Yuan Dynasty is the newly excavated Tonghui River, which was supported by Guo Shoujing, a famous astronomer and water conservancy scientist in the Yuan Dynasty.
Grain is gradually mainly transported by sea.
meaning
The transportation problem of the South-to-North Water Diversion Project was solved, and the grain reached Beijing directly from the south, which also connected some major water systems in China, strengthened the economic and cultural exchanges between the north and the south, and played a certain role in safeguarding national unity and consolidating political power in the Yuan Dynasty.