EVOLUTIONARY FEATURES OF THE ZHAOYUAN SANDY BEACH
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摘要:
基于表层沉积物、卫星影像和水深地形等资料, 结合岸濉演化数学模型、表层沉积物起动流速等方法，对招远砂质海岸的岸滩演化特征和控制因素进行了初步研究。结果表明, 由于受春雨码头和人工岛群建设影响, 界河口附近海域由侵蚀转为淤积状态, 春雨码头附近海域侵蚀程度加剧。波浪控制着研究区表层沉积物分布和泥沙运动, 人工构筑物建设是造成研究区海岸冲淤变化的主要原因。潜堤建设能有效减少波浪对堤后海岸的.影响, 对蚀退岸线保护效果明显。
Abstract:This paper is devoted to the evolutionary features of the sandy beach in Zhaoyuan in order to reveal its controlling factors, using the methods of surficial sampling, satellite imaging, numerical simulation of coastal evolution and calculation of the incipient velocity for sediment movement. The results show that the construction of the complex of Chunyu harbor and artificial island has greatly changed the scouring and silting environment of the study area, and then caused significant changes of the coastal area near the Jie river from erosion to siltation, and the increase in erosion around the Chunyu harbor. Wave is the main force that affects the distribution of surface sediments and sediment movement. The construction of artificial structures is obviously the main reason for the change in coastal scouring and silting regime in the study area. The submerged breakwater has effectively reduced the wave action on the coast and contributed greatly to coastal protection.
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Key words:
- sandy coast /
- evolution of shore beach /
- controlling factors /
- submerged breakwater
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表 1 研究区表层沉积物起动流速计算表
Table 1. Calculation of Incipient Flow Rate for Surface Sediments in Study Area
站位 水深/m 粒径/mm 起动流速/(cm/s) 涨急流速/(cm/s) 能否起动 落急流速/(cm/s) 能否起动 1-1 3.36 0.12 16.35 6.32 × 8.29 × 1-2 4.39 0.02 31.44 6.30 × 8.11 × 1-3 5.31 0.03 28.62 4.23 × 6.65 × 3-1 2.92 0.73 24.28 5.90 × 6.58 × 3-2 4.23 1.44 33.59 9.68 × 10.50 × 3-3 5.21 1.19 30.62 10.65 × 11.68 × 3-4 5.53 1.23 31.07 11.05 × 12.87 × 6-1 1.59 0.15 16.18 4.49 × 1.41 × 6-2 3.77 0.58 21.93 7.05 × 2.83 × 6-3 5.17 0.84 25.96 9.03 × 7.23 × 6-4 5.75 0.69 23.71 10.59 × 14.45 × 8-1 1.29 0.16 16.16 1.37 × 1.53 × 8-2 4.46 0.08 17.53 2.24 × 4.61 × 8-3 5.12 0.92 27.05 10.75 × 17.13 × 8-5 7.27 0.49 20.43 15.39 × 26.84 √ 
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