波浪破碎散射模式的研究及应用

IOCAS-IR > 海洋环流与波动重点实验室

	波浪破碎散射模式的研究及应用
其他题名	Study of radar scattering model under waves breaking and its application
	李琨
学位类型	博士
	2009-05-26
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	波浪破碎散射截面风速入射角破碎率
摘要	海面反射、散射或自发辐射的各个波段的电磁波携带着海表面温度、海平面高度、海表面粗糙度以及海水所含各种物质浓度的信息。波浪破碎是海洋的一种重要现象，波浪破碎支撑着海－气之间的热通量和气体通量的交换，这些通量对于天气和气候都有深远影响。同时，波浪破碎使得海表的粗糙度增加，这对于海表散射电磁波有极大的影响，因此在处理雷达散射问题时，考虑波浪破碎的影响十分必要。本文分析了雷达散射的两种模式，并阐述了波浪破碎在海表电磁波散射过程中的重要性。论文的创新点在于利用Kudryavtsev03模式，反演得到了波浪破碎率与风速的两种新关系式，同时得到了较高精度的风速反演的隐含模式。针对波浪破碎微波散射模式问题，论文主要研究结果如下： 1.在Kudryavtsev03模式的基础上，以黄兴忠的白冠覆盖率公式替代破碎率，利用ERS-1散射计数据，对Bragg散射模式和Kudryavtsev03模式的结果进行了比较。结果表明：在相同条件下，考虑波浪破碎的Kudryavtsev03模式明显优于纯Bragg散射模式。 2 对Kudryavtsev03模式进行了修正。通过与实测ERS-1散射计数据比较，表明修正后，入射角在18-35°范围内，模式的结果具有较高的精度。 3 利用修正后的模式及散射计数据，在入射角为30-35°范围内，反演破碎率，并对反演结果进行了拟合，得到了两个新的破碎率与风速的关系式。 4 利用修正后的模式及新的破碎率公式，在入射角为30-35°范围内，反演风速，具有较高精度。 5 利用反演的风速，根据经验关系式，推算了各种海洋物理量。
其他摘要	Electromagnetic waves in various bands of surface reflection, scattering or spontaneous emission carry various information about surface temperature, sea level height, sea surface roughness, as well as concentrations of a variety of substances contained in sea water. Wave breaking is an important phenomenon in the ocean, and wave breaking supports air–sea fluxes of heat and gas, which have a profound effect on weather and climate. However, it will be a complex problem to retrieval the ocean parameter, with scattering model, due to the increased the sea surface roughness caused by breaking waves. Thus, it is necessary to deal with the issue of radar scattering under wave breaking. This thesis focuses on the two models of radar scattering, and investigated the influence of the waves breaking on the scattering of electromagnetic waves from the sea surface. Two new relationships between the wave breaking coverage and the wind speed are proposed based on the improved Kudryavstec03 mode. Meanwhile, an implicit model for retrieving wind speed is proposed with high accuracy. For microwave scattering models from breaking wave, the major contents in this thesis are as follows: 1. Based on the Kudryavstec03 model, wave breaking coverage is replaced by whitecap coverage of Huang. Moreover, both the results of Bragg scattering model and Kudryavstec03 model are compared with the ERS-1 scatterometer data. It is shown that the Kudryavstec03 model considering the breaking wave is superior to pure Bragg scattering model for the same conditions. 2. The Kudryavstec03 model is improved by multiply a function of incidence so that the result of model consistent with ERS-1 data. Research shown that the results obtained from the improved Kudryavstec03 model much better than those of original model for the angle of incidence from 18º to 35º to compare with data measured by ERS-1 scatterometer. The improved model can be used to retrieve 3. Based on the improved model and scatterometer data, two new relationships between wave breaking rate and the wind speed are obtained from retrieving the wave breaking rate in the rang of 30º-35º for the angle of incidence. 4. With the improved model and newly proposed the wave breaking rate, wind speed is retrieved with higher accuracy in the rang of 30º-35º for the angle of incidence 5. A variety of oceanic physical parameters are calculated by some the experiential relationships between those parameters and wind speed, such as whitecap coverage.
页数	123
语种	中文
文献类型	学位论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/1211
专题	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	李琨. 波浪破碎散射模式的研究及应用[D]. 海洋研究所. 中国科学院海洋研究所,2009.

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