陈可锋, 曾成杰, 王乃瑞, 徐俊晖. 南黄海大型潮汐水道动力地貌环境对人类活动响应——以小庙洪水道为例[J]. 水科学进展, 2020, 31(4): 514-523. DOI: 10.14042/j.cnki.32.1309.2020.04.005
引用本文: 陈可锋, 曾成杰, 王乃瑞, 徐俊晖. 南黄海大型潮汐水道动力地貌环境对人类活动响应——以小庙洪水道为例[J]. 水科学进展, 2020, 31(4): 514-523. DOI: 10.14042/j.cnki.32.1309.2020.04.005
CHEN Kefeng, ZENG Chengjie, WANG Nairui, XU Junhui. Dynamic geomorphological environment of large tidal channels in the South Yellow Sea and its response to human activities: a case study of Xiaomiaohong tidal channel[J]. Advances in Water Science, 2020, 31(4): 514-523. DOI: 10.14042/j.cnki.32.1309.2020.04.005
Citation: CHEN Kefeng, ZENG Chengjie, WANG Nairui, XU Junhui. Dynamic geomorphological environment of large tidal channels in the South Yellow Sea and its response to human activities: a case study of Xiaomiaohong tidal channel[J]. Advances in Water Science, 2020, 31(4): 514-523. DOI: 10.14042/j.cnki.32.1309.2020.04.005

南黄海大型潮汐水道动力地貌环境对人类活动响应——以小庙洪水道为例

Dynamic geomorphological environment of large tidal channels in the South Yellow Sea and its response to human activities: a case study of Xiaomiaohong tidal channel

  • 摘要: 辐射沙脊群内潮汐水道由于没有固定的边界,其稳定性对人类活动影响更加敏感。通过收集近20年来辐射沙脊群南翼小庙洪海域实测高分辨率水下地形资料,结合数学模型分析研究人类活动对小庙洪海域水动力和地形冲淤累积影响。研究结果表明:近20年来小庙洪水域边滩匡围面积达126.09 km2,边滩匡围导致小庙洪尾部、中部及口门段断面流量分别减小14.2%、15.79%和9.13%;尾部、中部及口门段深槽区平均流速分别减小20~30 cm/s、10~20 cm/s和5~10 cm/s。小庙洪水道南侧-5 m等深线变化幅度较小,基本保持稳定状态;-10 m等深线继续向西延伸,向南拓展。近20年来小庙洪边滩匡围虽导致水道内纳潮量和水动力有所减弱,但由于目前匡围区均处于高滩区域,各匡围工程所引起的泥沙冲淤仅限于工程区附近,对小庙洪水道整体稳定性、深槽主轴南逼、口门水道整体北淤南冲的演变趋势没有产生明显影响。

     

    Abstract: Due to the lack of a fixed boundary, the stability of tidal channels in radial sand ridges is more sensitive to the impact of human activities. In this study, based on high-resolution underwater topography data of the Xiaomiaohong tidal channel in the southern part of the radial sand ridges collected over the past 20 years, the morphodynamic responses to the cumulative impact of human activities are investigated and simulated by numerical modeling. Results show that the section discharges at the tail, middle, and head parts of the Xiaomiaohong tidal channel induced by reclamation, which has reached 126.09 km2 in the past 20 years, are down 14.2%, 15.79%, and 9.13%, respectively; the average current velocities were also decreased by 20—30 cm/s, 10—20 cm/s, and 5—10 cm/s, respectively. The -5 m isobath on the southern side of the Xiaomiao channel has essentially remained stable with few changes; while the -10 m isobath is expanding westward and southward. Although the reclamation projects have resulted in a decrease of tidal capacity and hydrodynamics, the erosion and deposition they cause are restricted to the areas around the projects because of their high elevation. Overall, reclamation has little effect on the stability, southward moving, and the erosion trends of the Xiaomiaohong tidal channel.

     

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