Jianyu Tan
Harbin Institute of Technology
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Publication
Featured researches published by Jianyu Tan.
Optics Express | 2015
Liyong Ma; Fuqiang Wang; Cun-Hai Wang; Jianyu Tan
The presence of bubbles can significantly change the radiative properties of seawater and these changes will affect remote sensing and underwater target detection. In this work, the spectral reflectance and bidirectional reflectance characteristics of the bubble layer in the upper ocean are investigated using the Monte Carlo method. The Hall-Novarini (HN) bubble population model, which considers the effect of wind speed and depth on the bubble size distribution, is used. The scattering coefficients and the scattering phase functions of bubbles in seawater are calculated using Mie theory, and the inherent optical properties of seawater for wavelengths between 300 nm and 800 nm are related to chlorophyll concentration (Chl). The effects of bubble coating, Chl, and bubble number density on the spectral reflectance of the bubble layer are studied. The bidirectional reflectance distribution function (BRDF) of the bubble layer for both normal and oblique incidence is also investigated. The results show that bubble populations in clear waters under high wind speed conditions significantly influence the reflection characteristics of the bubble layer. Furthermore, the contribution of bubble populations to the reflection characteristics is mainly due to the strong backscattering of bubbles that are coated with an organic film.
Applied Optics | 2015
Lanxin Ma; Fuqiang Wang; Cun-Hai Wang; C. C. Wang; Jianyu Tan
Spectral properties of sea foam greatly affect ocean color remote sensing and aerosol optical thickness retrieval from satellite observation. This paper presents a combined Mie theory and Monte Carlo method to investigate visible and near-infrared spectral reflectance and bidirectional reflectance distribution function (BRDF) of sea foam layers. A three-layer model of the sea foam is developed in which each layer is composed of large air bubbles coated with pure water. A pseudo-continuous model and Mie theory for coated spheres is used to determine the effective radiative properties of sea foam. The one-dimensional Cox-Munk surface roughness model is used to calculate the slope density functions of the wind-blown ocean surface. A Monte Carlo method is used to solve the radiative transfer equation. Effects of foam layer thickness, bubble size, wind speed, solar zenith angle, and wavelength on the spectral reflectance and BRDF are investigated. Comparisons between previous theoretical results and experimental data demonstrate the feasibility of our proposed method. Sea foam can significantly increase the spectral reflectance and BRDF of the sea surface. The absorption coefficient of seawater near the surface is not the only parameter that influences the spectral reflectance. Meanwhile, the effects of bubble size, foam layer thickness, and solar zenith angle also cannot be obviously neglected.
Energy Conversion and Management | 2014
Fuqiang Wang; Jianyu Tan; Zhiqiang Wang
Energy Conversion and Management | 2014
Fuqiang Wang; Jianyu Tan; Yong Shuai; Liang Gong; He-Ping Tan
International Journal of Heat and Mass Transfer | 2014
Fuqiang Wang; Jianyu Tan; Shuai Yong; He-Ping Tan; Shuangxia Chu
Energy Conversion and Management | 2015
Fuqiang Wang; Jianyu Tan; Lanxin Ma; Yu Leng
International Journal of Heat and Mass Transfer | 2016
Cheng-An Wang; Lan-Xin Ma; Jianyu Tan; Lin-Hua Liu
International Journal of Heat and Mass Transfer | 2017
Jianyu Tan; Yinmo Xie; Fuqiang Wang; Lin Jing; Lanxin Ma
Heat Transfer Research | 2019
Ziming Cheng; Ruitian Yu; Fuqiang Wang; Huaxu Liang; Ming Xie; Dong Li; Jianyu Tan
International Journal of Heat and Mass Transfer | 2018
Kun Zhang; Cheng-An Wang; Jianyu Tan