南海文昌海域内波特征研究

IOCAS-IR > 海洋环流与波动重点实验室

	南海文昌海域内波特征研究
其他题名	The characters of internal waves and internal tides in WenChang
	柯自明
学位类型	博士
	2007-06-11
学位授予单位	中国科学院海洋研究所
学位授予地点	海洋研究所
关键词	内孤立波内潮波内波波致流内波传播方向文昌
摘要	2005年中科院海洋所对琼东文昌海域进行了精细内波观测。本文对此次观测所获得的资料进行分析，研究了观测海域内孤立波、内潮、内波波致流和内波传播方向的统计特征，得到观测海域内波的基本特征。首先，观测海域内孤立波频繁发生。在149天的观测当中，一共出现140个孤立波列，出现频率达到了0.94次/天。出现频率最高的振幅是32米，最常见的内孤立波持续时间时20分钟。80%的内孤立波都在以下范围之内：持续时间从13分钟到32分钟，振幅从16米到46米。在这一区间范围之类，内孤立波的持续时间和振幅并没有明显的函数关系，表现出随机分布的特征。同时内孤立波的振幅有着明显的季节变化特征。从4月中旬到6月中旬内孤立波频繁出现且振幅较大，振幅超过35米的内孤立波相当常见；而6月中旬到9月中旬，内孤立波的发生频率明显下降，振幅也偏低，振幅超过35米的内孤立波属于少数情况。其次，观测地的内潮以日频率的振动为主，间隔有半日频率的内潮出现，与当地天文潮情况相似。其振幅小于内孤立波的振幅，在每个观测日都能观测到。内潮的振幅有着明显的季节变化，7月是内潮振幅最小的一个月。再次，观测地内波波致流的大小和剪切层位置有着明显的季节变化。在4月和5月内波波致流流速较大而且靠近海底。而在6月以后，内波波致流较弱，并且剪切层也更为靠近海面。最后，观测地内波可能在局地生成，由于主要呈现全日频率可以排除在吕宋海峡生成的可能。同时传播方向同样随季节变化。4月和5月观测到的内波传播方向主要与等深线线平行，极少被卫星遥感图片观测到。6月、7月、8月和9月传播方向与等深线垂直。
其他摘要	A field program to measure the internal wave characteristics was undertaken in April to October 2005 at Wen Chang by Institute of Oceanology, Chinese Academic of Science. After analyzing the jaw data collecting from the observation program, we can conclude several element characters of internal waves in this area. First of all, the appearance of internal solitary waves there is frequent. Between the period of observation, we found 149 solitary waves and the frequency of appearance of internal solitary waves is 0.94 per day. The most common amplitude of these internal solitary waves is 32 m, and the most common period is 20 min. 80 percent of these internal solitary waves which had period from 13 min to 32 min, and amplitude from 16 m to 46 m, had a random distribution and there is no a remarkable relationship between their period and amplitude. But the amplitude of these internal solitary waves had notable change with the seasons. In the April to June, the internal solitary waves appeared frequently and had a strong amplitude which were always above 35 m; in the July to September, there were less internal solitary waves and their amplitude were smaller. Secondly, the dominate frequency of internal tides there is diurnal, which were the same as the barotropic tides there. We observed the baroclinic tides everyday, and them also changed with the seasons. The internal tides had the smallest amplitude in July. Thirdly, the current speed induced by internal waves changed with seasons. In April, the speed was high reaching 2 m per second, and the highest current speed appeared near the bottom of the sea. In the summer especially in August and September, the current speed was not notable strong as the current speed in April and May and the current speed both near the surface and bottom, had the same scale. Finally, the progress direction of internal wave there always changed. In April and May, the progress direction was parallel with isobaths of sea, but in the last period of the observation, the progress direction was always vertical with the isobaths.
页数	70
语种	中文
文献类型	学位论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/511
专题	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	柯自明. 南海文昌海域内波特征研究[D]. 海洋研究所. 中国科学院海洋研究所,2007.

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