太阳高度角对太湖水体真光层深度变化的影响分析

在假定水体表面为镜面、水体中无内光源、无非弹性散射的前提下,通过Kirk的辐射传输理论,研究了太湖水体中不同的太阳高度角对真光层深度变化的影响.结果表明,散射系数与吸收系数的比(b/a)值的大小是决定太阳高度角对真光层深度影响的关键因子,b/a315时,太阳高度角对真光层深度的影响较小,基本可以忽略.针对秋季太湖区域而言,在较短波段(400~540nm)b/a的值在整个湖区均较小,此时要考虑太阳高度角对真光层深度的影响;在较长波段(540~700nm), b/a的值在整个湖区均较大,可以不考虑太阳高度角对真光层深度的影响.

Analysis on the effect of the solar altitude angles on the euphotic depth in Lake Taihu

In the context of Kirk's radiative transfer theory under the assumption that a mirror surface water column has no internal light source and elastic scattering,an investigation was conducted on the effect of the solar altitude angles on the depth of euphotic layer in Taihu Lake.Evidences showed that the ratio of scattering to absorption coefficients(b/a) was the key factor to determine the extent of the above effect,which would be smaller and even be neglected if the ratio(b/a) reached to 15 or larger.As for...