ANTI-ERODIBILITY OF CORAL REEF LIMESTONES ON THE XISHA-NANSHA ISLANDS
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摘要:
台风、风浪、涌浪、风暴潮、天文潮等现象中的气流和水流往往携带大量固体碎屑物，对南海岛礁礁灰岩体产生强烈的侵蚀作用。笔者首先通过珊瑚的磨蚀与压缩实验验证了磨蚀理论的可靠性；其次，由抗压强度和弹性模量定义了具有压强量纲的抗蚀因子，以定量描述岩石抵抗风水侵蚀的能力；最后，对石岛西南端地表风成灰岩进行了初步研究，发现其抗蚀能力较弱。礁灰岩抗蚀性研究将为南海岛礁防护提供一定的科学依据。
Abstract:In the South China Sea, carbonate debris and fragments are commonly transported by air and waterflow in forms of typhoon, wind wave, swell, storm surges and astronomic tide etc. accompanied by strongly erosion of the reef limestones. The research work presented in this paper confirmed the reliability of the abrasion theoretical model we developed via abrasion and compression experiments firstly. And then, the anti-erodibility factor with the dimension of pressure is defined using compressive strength and elastic modulus to quantificationally describe the anti-erodibility of rocks against wind and water. Finally, the preliminary investigation reveals that the aeolianites on the southwest of Shidao island have relative low anti-erodibility. The study of the anti-erodibility of reef limestones will provide certain scientific support for protection of the islands and reefs in the South China Sea.
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Key words:
- coral reef limestone /
- anti-erodibility /
- abrasion /
- compression /
- Shidao island
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表 1 珊瑚与石岛灰岩的力学参数
Table 1. Mechanical parameters of coral and carbonate rocks
样品形状 编号 抗压强度 
/MPa弹性模量E/GPa 编号 抗压强度 
/MPa弹性模量E/GPa 片状珊瑚 A1 4.549 0.102 A2 3.533 0.052 A3 3.535 0.204 A4 3.383 0.103 A5 2.416 0.135 A6 5.762 0.113 A7 1.629 0.215 A8 3.318 0.199 平均值 3.516 0.140 块状珊瑚 B1 19.657 1.818 B2 20.738 1.743 B3 3.176 0.151 B4 4.820 0.122 B5 6.888 0.168 B6 10.060 0.356 B7 3.722 0.402 B8 4.897 0.135 B9 4.648 0.113 B10 7.438 0.323 B11 8.905 0.248 B12 5.172 0.298 平均值 8.343 0.490 树枝状珊瑚 C1 15.441 0.948 C2 11.251 1.166 C3 26.080 1.194 C4 30.244 4.156 C5 36.329 1.034 C6 18.633 0.639 C7 22.562 4.084 C8 16.263 0.950 C9 22.769 1.563 C10 14.736 1.142 平均值 21.431 1.688 石岛灰岩 S1 6.139 0.575 S2 6.686 0.751 S3 5.513 0.252 S4 4.599 0.188 S5 4.560 0.318 S6 3.379 0.461 S7 4.259 0.461 S8 3.883 0.245 S9 9.095 0.303 S10 2.970 0.089 S11 3.431 0.218 S12 7.095 0.725 平均值 5.134 0.355 
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表 2 南海岛礁礁灰岩抗蚀性的定量比较
Table 2. Comparison of anti-erodibility factors among rocks collected on the islands and reefs in the South China Sea
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