Analysis of planform migration characteristics and lag effects in meandering rivers using remote sensing image interpretation  

作　　者：Jizhe HU Junqiang XIA Shanshan DENG 

机构地区：[1]State Key Laboratory of Water Resources Engineering and Management,Wuhan University,Wuhan 430072,China

出　　处：《Science China Earth Sciences》2025年第3期824-835,共12页中国科学(地球科学英文版)

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. U2040215 & 52379079)。

摘　　要：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 1,000times, the ratio of lag distance to river width(relative lag distance) for meandering rivers consistently falls within the range of 2.0to 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.

关 键 词：Meandering rivers Remote sensing image Planform extraction Migration rate Lag response 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置] P332[自动化与计算机技术—控制科学与工程]