Analysis of planform migration characteristics and lag effects in meandering rivers using remote sensing image interpretation.
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| Title: | Analysis of planform migration characteristics and lag effects in meandering rivers using remote sensing image interpretation. |
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| Authors: | Hu, Jizhe1 (AUTHOR), Xia, Junqiang1 (AUTHOR) xiajq@whu.edu.cn, Deng, Shanshan1 (AUTHOR) dengss@whu.edu.cn |
| Source: | SCIENCE CHINA Earth Sciences. Mar2025, Vol. 68 Issue 3, p824-835. 12p. |
| Subject Terms: | *Meandering rivers, *Alluvial streams, *River channels, *Remote sensing, *Image analysis |
| Abstract: | Meandering rivers of various scales are found globally and exhibit a high degree of regularity in their evolutionary processes. This study utilized remote sensing interpretation techniques to extract and analyze the planform migration characteristics of meandering rivers. Specifically, remote sensing images of three meandering rivers—the Black and White Rivers in the Tibetan Plateau and the Itui River in the Amazon Basin—were selected for this analysis. By comparing these observations with existing research data, this study quantitatively revealed the lag response patterns in the planform migration processes of meandering rivers. The findings of the study revealed several key insights. (1) The average migration rates for the three rivers were determined to be 1.74, 3.84, and 2.34 m/a, respectively. The critical values of the relative curvature radius for the river channels ranged from 1.5 to 2.0, 1.7 to 2.2, and 2.5 to 3.0, where local migration rate peaks were observed. These findings align with previous research that reported critical values between 2.0 and 4.0. (2) A significant lag is observed in the migration rate relative to curvature in spatial variation, with lag distances for the Black, White, and Itui Rivers measuring 227, 281, and 324 m, corresponding to 2.02, 2.39, and 3.15 times the river width, respectively. (3) A comparison with other meandering rivers indicates that, despite significant variations in climatic and hydrological conditions and river discharges differing by over 1,000 times, the ratio of lag distance to river width (relative lag distance) for meandering rivers consistently falls within the range of 2.0 to 4.0. This study suggests that the establishment of critical values for the relative curvature radius and the concentration of the relative lag distance reflects distinct quantitative relationships that emerge during the evolutionary processes of meandering rivers, aiming to minimize energy expenditure. These relationships appear to be applicable to various types of alluvial rivers. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
| Abstract: | Meandering rivers of various scales are found globally and exhibit a high degree of regularity in their evolutionary processes. This study utilized remote sensing interpretation techniques to extract and analyze the planform migration characteristics of meandering rivers. Specifically, remote sensing images of three meandering rivers—the Black and White Rivers in the Tibetan Plateau and the Itui River in the Amazon Basin—were selected for this analysis. By comparing these observations with existing research data, this study quantitatively revealed the lag response patterns in the planform migration processes of meandering rivers. The findings of the study revealed several key insights. (1) The average migration rates for the three rivers were determined to be 1.74, 3.84, and 2.34 m/a, respectively. The critical values of the relative curvature radius for the river channels ranged from 1.5 to 2.0, 1.7 to 2.2, and 2.5 to 3.0, where local migration rate peaks were observed. These findings align with previous research that reported critical values between 2.0 and 4.0. (2) A significant lag is observed in the migration rate relative to curvature in spatial variation, with lag distances for the Black, White, and Itui Rivers measuring 227, 281, and 324 m, corresponding to 2.02, 2.39, and 3.15 times the river width, respectively. (3) A comparison with other meandering rivers indicates that, despite significant variations in climatic and hydrological conditions and river discharges differing by over 1,000 times, the ratio of lag distance to river width (relative lag distance) for meandering rivers consistently falls within the range of 2.0 to 4.0. This study suggests that the establishment of critical values for the relative curvature radius and the concentration of the relative lag distance reflects distinct quantitative relationships that emerge during the evolutionary processes of meandering rivers, aiming to minimize energy expenditure. These relationships appear to be applicable to various types of alluvial rivers. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 16747313 |
| DOI: | 10.1007/s11430-024-1483-7 |
