Variations in sedimentation characteristics of the Yellow River Delta under the remote influence of Typhoon Doksuri
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摘要:
通过原位观测、无人机遥测、野外调查取样和室内测试分析等多种手段，探讨了2023年台风“杜苏芮”外围风圈对黄河三角洲沉积环境的影响。研究结果表明：① 台风外围风圈引起黄河三角洲区域风场特征出现快速调整，河口动力增强，导致沉积物再悬浮；② 受海洋动力变化影响，河口三角洲不同断面整体呈现出近海一侧高程降低、向陆一侧潮沟增加的特征，受沿海人为工程影响，垦东12附近台风后淤积明显，废弃清水沟河道断面靠海部分侵蚀，靠岸部分淤积；③ 除高程外，三角洲不同断面位置沉积物粒度发生显著变化，粒度变化受到潮沟侵蚀、河流输沙、河口侵蚀和废弃河道充填等不同因素的影响，呈现出空间差异性。研究结果揭示了未直接过境的台风依然可能通过外围风圈影响三角洲沉积演化过程，在未来三角洲沉积演化研究与防灾减灾应对过程中应予以重视。
Abstract:To explore the influence of a non-directly passing typhoon on the sedimentary dynamic environment and characteristics of the Yellow River Delta, the impact of the peripheral wind field of Typhoon Doksuri in 2023 on the sedimentary environment of the deltaic area was studied through a combination of in-situ observations, unmanned aerial vehicle (UAV) remote sensing, field survey sampling, and laboratory analysis. Results indicate that: (1) The peripheral wind field of the typhoon caused a rapid change in wind pattern in the delta region, enhanced the estuarine dynamics, and triggered the resuspension of sediments. (2) Variations in marine dynamics resulted in different cross-sectional characteristics within the estuarine delta, which reduced the elevation in the nearshore segment and increased the tidal creeks landside. Due to coastal engineering, sedimentation was increased notably near Kendong 12 Block of the Shengli Oilfield in the study area after the typhoon. The abandoned Qingshuigou River channel experienced erosion seaward and sedimentation shoreward. (3) In addition to the elevation change, significant changes in sediment grain size occurred in different cross-sections of the delta. The changes in grain size were influenced by various factors such as tidal creek erosion, river sediment transport, estuarine erosion, and filling of abandoned river channels, showing spatial differences. The findings of the study demonstrate that typhoons do not directly pass through the delta can still affect the sedimentary evolution process in this region through their peripheral wind field, which should be taken into consideration seriously in future research on delta sedimentary evolution and disaster prevention and mitigation efforts.
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Key words:
- Typhoon Doksuri /
- remote influence /
- sedimentary dynamics /
- delta evolution /
- Yellow River Delta
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