| 路川藤，王坚，李肖肖，朱显博.流域来沙锐减条件下长江口南支河床稳定性研究[J].海洋工程,2025,(3):165~172 |
| 流域来沙锐减条件下长江口南支河床稳定性研究 |
| Study on the riverbed stability of the South Branch of the Yangtze River Estuary under the condition of sharp decrease in sediment supply |
| 投稿时间：2024-05-17 修订日期：2024-08-21 |
| DOI：10.16483/j.issn.1005-9865.2025.03.015 |
| 中文关键词: 长江口 南支河段 数学模型 河势稳定 分形维数 |
| 英文关键词:Yangtze River Estuary South Branch mathematical model river regime stability fractal dimension |
| 基金项目:国家重点研发计划重点专项（2023YFC3208500） |
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| 中文摘要: |
| 长江口南支河段是长江入海口的第一级分汊，在流域来沙变化及河道整治工程的影响下，南支河势发生了明显变化，采用河道断面分形维数和河床活动性综合指标两种判别方法，分析了三峡工程运行及河道整治工程实施后，长江口南支河段河床稳定性。研究表明：2003年三峡工程运行后，南支河床容积增加主要表现在?5 m等深线以深的深槽水域；在无河道整治的自然条件下，南支主要沙体均发生了明显变迁，河道整治工程后，各沙体趋于稳定，工程建设起到了抑制沙体活动、稳定河势的作用；三峡工程运行后，南支河床断面分形维数值、河床活动性综合指标值下降，说明南支河段过流能力增强，目前分形维数值在1.15~1.25之间，值在760~843之间，南支下游河段河床活动性相对较高。 |
| 英文摘要: |
| The South Branch of the Yangtze River Estuary is the first-level bifurcation of the river's mouth. Under the influence of changes in sediment supply and river regulation projects, the river regime of the South Branch has undergone significant alterations. This study utilizes two methods—fractal dimension of the river cross-section and a comprehensive index of riverbed activity—to analyze the riverbed stability changes in the South Branch after the operation of the Three Gorges Project and river regulation project. The study indicates that after the operation of the Three Gorges Project in 2003, the volume of the South Branch riverbed increased, particularly in the deep troughs below the ?5 m isobath. In natural conditions without river regulation, significant changes occurred in the major sand bodies of the South Branch. Following the implementation of river regulation projects, the sand bodies tended to stabilize, demonstrating the role of these projects in suppressing sand body movement and stabilizing the river regime. After the operation of the Three Gorges Project, the fractal dimension of the river cross-section and the comprehensive riverbed activity index decreased, indicating enhanced discharge capacity in the South Branch. Currently, the fractal dimension value ranges from 1.15 to 1.25, while the value ranges from 760 to 843, with higher bed activity observed in the downstream section of the South Branch. |
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