Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Analysis of Erosion and Deposition Characteristics in Hukou-Jiangyin Reach of the Lower Yangtze River After the Operation of the Three Gorges Project
With the operation of the Three Gorges Project (TGP) and the reservoirs in the upper reaches of the Yangtze River, the sediment transport reduced significantly in the lower reaches of the Yangtze River since 2003, leading to great changes in the relationship between flow and sediment. In order to study the variation characteristics of the river channel under new conditions, the variation characteristics of flow and sediment at the main hydrological stations, the amount and intensity of erosion/deposition in the Hukou-Jiangyin reach, and the distribution of erosion/deposition in the channel were analyzed. The results showed that the Hukou-Jiangyin reach experienced both erosion and deposition from 1998 to 2006, while unidirectional erosion in both benchland and channel after 2006. From 2006 to 2020, the average annual erosion intensities per kilometer below bankfull channel in Hukou-Datong reach and Datong-Jiangyin reach were 12.56 × 104 m3/km and 17.17 × 104 m3/km, increasing by 79.94% and 67.35%, respectively, compared with those during the period from 1998 to 2001, i.e., the times before the impoundment of TGP. The riverbed erosion intensity of Datong-Jiangyin reach was 37% higher than that of the upper Hukou-Datong reach. The erosion mainly occurred below bankfull channel, while the erosion between low water channel and bankfull channel only accounted for 10% – 20%. Specifically, the ratios of the erosion below low water channel and bankfull channel to those below flood channel accounted for 86.67% and 91.14% in Hukou-Datong reach, respectively. And those ratios in Datong-Jiangyin reach were 80.34% and 86.69%, respectively.
Analysis of Erosion and Deposition Characteristics in Hukou-Jiangyin Reach of the Lower Yangtze River After the Operation of the Three Gorges Project
With the operation of the Three Gorges Project (TGP) and the reservoirs in the upper reaches of the Yangtze River, the sediment transport reduced significantly in the lower reaches of the Yangtze River since 2003, leading to great changes in the relationship between flow and sediment. In order to study the variation characteristics of the river channel under new conditions, the variation characteristics of flow and sediment at the main hydrological stations, the amount and intensity of erosion/deposition in the Hukou-Jiangyin reach, and the distribution of erosion/deposition in the channel were analyzed. The results showed that the Hukou-Jiangyin reach experienced both erosion and deposition from 1998 to 2006, while unidirectional erosion in both benchland and channel after 2006. From 2006 to 2020, the average annual erosion intensities per kilometer below bankfull channel in Hukou-Datong reach and Datong-Jiangyin reach were 12.56 × 104 m3/km and 17.17 × 104 m3/km, increasing by 79.94% and 67.35%, respectively, compared with those during the period from 1998 to 2001, i.e., the times before the impoundment of TGP. The riverbed erosion intensity of Datong-Jiangyin reach was 37% higher than that of the upper Hukou-Datong reach. The erosion mainly occurred below bankfull channel, while the erosion between low water channel and bankfull channel only accounted for 10% – 20%. Specifically, the ratios of the erosion below low water channel and bankfull channel to those below flood channel accounted for 86.67% and 91.14% in Hukou-Datong reach, respectively. And those ratios in Datong-Jiangyin reach were 80.34% and 86.69%, respectively.
Analysis of Erosion and Deposition Characteristics in Hukou-Jiangyin Reach of the Lower Yangtze River After the Operation of the Three Gorges Project
Lecture Notes in Civil Engineering
Li, Yun (Herausgeber:in) / Hu, Yaan (Herausgeber:in) / Rigo, Philippe (Herausgeber:in) / Lefler, Francisco Esteban (Herausgeber:in) / Zhao, Gensheng (Herausgeber:in) / Cao, Shuang (Autor:in) / Cheng, Long (Autor:in) / Wang, Nairu (Autor:in) / Li, Qiang (Autor:in) / Luo, Hongyu (Autor:in)
Smart Rivers ; 2022 ; Nanjing
26.02.2023
13 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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