摘要
利用叶绿素浓度、海表风速数据及集鱼灯、渔船的相关特征参数(集鱼灯的配光曲线、波谱分布、辐射通量、集鱼灯在渔船上几何位置等),采用Monte Carlo方法构造了一个计算水上集鱼灯水下辐照度分布的模型。该模型利用叶绿素浓度数据、纯海水水光学特性及其与吸收、散射系数的关系计算波束衰减系数(包括吸收系数、散射系数),利用风速数据构造毛细波面,计算该波面对光路及菲涅耳反射的影响。该模型与传统计算方法相比,有如下优点:(1)利用叶绿素浓度数据计算波束衰减系数,并考虑了波束衰减系数的波谱特征;(2)能提供不同水层集鱼灯向下辐照度的光谱分布;(3)能提供渔船阴影区向下辐照度的分布;(4)考虑了毛细波面的影响,使集鱼灯水下辐照度的计算更合理;(5)叶绿素浓度、风速数据可由遥感获取,使模型更易应用于实际计算。模型计算结果与实测值进行了比较,相对均方根误差为37.6%,但两者之间存在显著相关性(P<0.001),文中对模型结果进行了分析。
In this paper,a computing model of underwater irradiance of fish aggregation lamps was developed based on Monte Carlo method by using chlorophyll concentration and wind speed with characteristic parameters of the lamps.The absorption and scatter character of chlorophyll concentration and pure sea water in class I waters were used to compute beam attenuation coefficient including absorption coefficient and scatter coefficient,and scattering cumulative distribution function.Wind speed was used to construct windblown capillary wave surface which would have a great influence on light fields for large air-incident angles.Compared with the traditional computing model,this model has the following advantages：（1）the model took the difference of beam attenuation coefficient over wavelength into account without a constant assumption or using guessing value;（2）the model can provide the spectral distribution of fishing lights for different depths which was important for design of fishhook and researches of fish behavior to light;（3）the scattering of the light was calculated,so the model can provide downward irradiance under the shadow area of fishing vessels;（4）the influence of the windblown capillary wave surface on the reflectance for large air-incident angle was taken into account,so that the model was more reasonable in computing underwater light field of fish aggregation lamps;（5）the chlorophyll and wind speed can be drawn from remote sensing data,which make the model easy to use.Comparing with the in situ measure data,the value computed by model was larger,the relative root mean error was 37.6%,but the correlation between the two data was significant（P0.001）.Finally,the difference between the two data was discussed.
出处
《水产学报》
CAS
CSCD
北大核心
2010年第10期1595-1604,共10页
Journal of Fisheries of China
基金
上海市教委科研创新重点项目(09ZZ168)
大洋生物资源开发与利用上海市高校重点实验室开放基金项目(KF200803)资助
上海市重点学科建设项目(S30702)
