Changes in Water Chemistry and Driving Factors in the Middle and Lower Reaches of the Beijing-Hangzhou Grand Canal

• Published in: Huanjing kexue Vol. 42; no. 5; p. 2251
• Main Authors: Cheng, Zhong-Hua, Deng, Yi-Xiang, Zhuo, Xiao-Ke, Dai, Dan, Yu, Tao
• Format: Journal Article
• Language: Chinese
• Published: China 08.05.2021
• Subjects: total dissolved solids(TDS); human influence; hydrochemistry; driving factors; Beijing-Hangzhou Grand Canal
• ISSN: 0250-3301
• DOI: 10.13227/j.hjkx.202009018

To reveal the Beijing-Hangzhou Grand Canal natural water chemistry characteristics and the influence of human activities, river samples from Xuzhou to Jiaxing were collected in 2019-2020. Simultaneously, the water chemistry data of the canal from 1959 to 1962 and 1975 to 1977 in the Suzhou, Wuxi, and Changzhou sections and the recent social and economic data of the major cities along the canal were collected and analyzed. The results showed that the type of hydrochemistry in the study area was mainly influenced by the weathering of carbonate rocks in the basin, but K +Na accounted for 40.39% of the cation equivalent concentration, which was higher than that in ordinary surface water, thereby indicating that the natural hydrochemistry of the canal had been significantly affected by human factors. Spatially, the major ion mass concentrations, total hardness, and total alkalinity of the Grand Canal from Xuzhou station to the downstream area tended to decrease overall, but the parameters at Wuxi and Suzhou statio