| 摘要: |
| 1995年10月在小东海珊瑚礁海岸的礁坪上进行示踪砂运移的现场实验。本次实验对浪、流以及示踪砂采样作了同步观测。根据所获的实验数据，分析了在9516号热带风暴天气过程礁坪上示踪砂运移的基本规律。在一级近似下，测定并计算了泥沙在波生流作用下的漂移速度与流速比因子为0.002，混合深度小于2cm。这一结果与其它已往结果相比明显小得多。通过现场比较，作者认为引起此差异的原因为：1）示踪砂的投放远离波浪破碎带，破碎波的影响很小，因此引起泥沙运移的动力条件比已往沙质海滩的示踪砂为弱；2）珊瑚礁海岸的糙率较砂质海滩大。 |
| 关键词: 珊瑚礁坪 示踪砂 现场实验 |
| DOI： |
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| 基金项目:国家自然科学青年基金资助项目，49606071号;国家海洋局青年基金资助项目，95205号;华东师范大学河口海岸动力沉积和动力地貌综合国家重点实验室开放基金资助项目，SKLEC-9504号 |
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| A FIELD EXPERIMENT OF TRACER SAND MOVEMENT ON CORAL REEF COAST DURING A TROPICAL STORM |
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LIU Xin-an, CUI Jin-rui, WANG Wen-hai, YANG Yu-di
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First Institute of Oceanography, State Oceanic Administration, Qingdao, 266003
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| Abstract: |
| A field experiment of tracer sand movement on the coral reef coast of Xiaodonghai was carried out in October 1995 during the No. 9516 tropical storm. In this experiment, the wave conditions, the wave-induced currents and the tracer sand dispersion were observed simultaneously. Based on the data obtained in this experiment, some preliminary characteristics of sand motion on coral reef platform are identified in this paper. At first approximation, the rating factor between the advection speed of sand motion and the current velocity under the wave-induced current is 0.002 and the depth of mixing is less than 2cm. These values are much smaller than the previous results which have been observed on sand beaches elsewhere. Such differences are caused by: 1) the position for tracer releasing on the coral reef platform in this experiment is far away from wave breaking zone and the effect of breaking wave is much less significant than that in previous field measurements; and 2) the bed roughness on the coral reef coast in this experiment is larger than that on the sand beach for previous studies. |
| Key words: Coral reef platform, Tracer sand, Field experiment |
