Analysis of Evolution Characteristics of Central Bars in the Lubao Section of the Beijiang River under Extreme Flood

ZHU Zhengtao; WANG Huilin; HUANG Dong; LIU Huamei; CHEN Xinchi; YU Chengzheng; JIANG Qingrong

doi:10.3969/j.issn.1001-9235.2026.01.005

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Analysis of Evolution Characteristics of Central Bars in the Lubao Section of the Beijiang River under Extreme Flood

更新时间：2026-02-26

- Analysis of Evolution Characteristics of Central Bars in the Lubao Section of the Beijiang River under Extreme Flood
- PEARL RIVER Vol. 47, Issue 1, Pages: 42-52(2026)
- 作者机构：
  
  1.广东省水利水电科学研究院，广东广州 510635
  2.河口水利技术国家地方联合工程实验室，广东广州 510635
  3.华南农业大学水利与土木工程学院，广东广州 510642
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.1001-9235.2026.01.005
  CLC： TV122
- Received：03 June 2025，
  
  Revised：2025-07-18，
  
  Accepted：24 July 2025，
  
  Online First：13 August 2025，
  
  Published：25 January 2026
- 稿件说明：
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朱政涛，王慧琳，黄东，等.极端洪水下北江芦苞浅段江心洲演变特征分析［J］.人民珠江，2026，47（1）：42-52.

ZHU Zhengtao,WANG Huilin,HUANG Dong,et al.Analysis of Evolution Characteristics of Central Bars in the Lubao Section of the Beijiang River under Extreme Flood[J].PEARL RIVER,2026,47(01):42-52.
朱政涛，王慧琳，黄东，等.极端洪水下北江芦苞浅段江心洲演变特征分析［J］.人民珠江，2026，47（1）：42-52. DOI： 10.3969/j.issn.1001-9235.2026.01.005.

ZHU Zhengtao,WANG Huilin,HUANG Dong,et al.Analysis of Evolution Characteristics of Central Bars in the Lubao Section of the Beijiang River under Extreme Flood[J].PEARL RIVER,2026,47(01):42-52. DOI： 10.3969/j.issn.1001-9235.2026.01.005.

摘要

2022年6月北江流域遭遇百年一遇特大洪水，对下游江心洲的形态与植被覆盖产生了显著影响。研究基于2022年多时相哨兵2号遥感影像及实测河道地形数据，结合归一化差分水体指数（Normalized Difference Water Index，NDWI）和归一化差分植被指数（Normalized Difference Vegetation Index，NDVI），分析了北江下游芦苞浅段5个江心洲的平面形态、断面地形、NDVI均值及植被覆盖的年内演变特征。结果表明：洪水期间各江心洲面积与周长均显著减小，其中未建土堤的中间洲、芦苞洲和太监洲面积减少幅度更大，分别达55.4%、69.0%和66.4%。河道断面地形显示洪水后主河槽以轻微淤积为主，江心洲高程未发生显著变化。建堤江心洲（邓塘洲、四姓洲）堤内植被受洪水影响较小，NDVI均值在洪水后仍保持较高水平，而江心洲堤外及未建堤江心洲植被面积普遍减少32.5%~74.4%。研究分析了特大洪水对北江下游芦苞浅段江心洲形态及植被覆盖的差异化影响，为区域河道治理与生态修复提供了科学依据。

Abstract

The Beijiang River Basin experienced a once-in-a-century catastrophic flood in June 2022

which had a significant impact on the morphology and vegetation distribution of the downstream central bars. Based on the 2022 multi-phase Sentinel-2 remote sensing images and measured river terrain data

combined with normalized difference water index (NDWI) and normalized difference vegetation index (NDVI)

this study analyzed the annual evolution characteristics of the planar morphology

cross-sectional terrain

NDVI mean values

and vegetation coverage of five central bars in the Lubao section of the lower reaches of the Beijiang River. The results show that the planar morphology of central bars is closely related to the water level of the river channel

and the area and circumference of each central bar significantly decrease during the flood period. Among them

the areas of the Zhongjian Bar

Lubao Bar

and Taijian Bar without soil embankments decrease even more

reaching 55.4%

69.0%

and 66.4%

respectively. The reduction in the area of Dengtang Bar and Sixing Bar with earthen embankments is 40.8% and 30.2%

respectively. Except for the period of the "June 2022" catastrophic flood

the circumference and area of each central bar in the Lubao section show relatively small changes in other months of 2022

only fluctuating up and down with changes in the water level of the Beijiang River. The statistical results of the area of each central bar show that it is the smallest in June

the second lowest in July

and the largest value occurred in April or May. The terrain of the river section shows that the main channel is mainly slightly silted up

and the elevation of the central bank does not change significantly after the flood

indicating that the terrain of the river channels near each central bar remains basically stable even under the largest historical flood such as the "June 2022" catastrophic flood. The vegetation inside the embankment of central bars (Dengtang Bar and Sixing Bar) is less affected by the catastrophic flood

and the average NDVI remains at a high level after the flood. However

the vegetation area outside the embankment and on central bars without embankment generally has two peaks in April and October

as well as a valley in June. The vegetation in these areas is significantly affected by the flood

and the vegetation area generally decreases by 32.5%~74.4% after the flood. The study analyzes the differential impact of the catastrophic flood on the morphology and vegetation coverage of central bars in the Lubao section of the Beijiang River

providing a scientific basis for regional river management and ecological restoration.

关键词

Keywords

references

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