Calibration of a general optical equation for remote sensing of suspended sediments in a moderately turbid estuary
Calibration of a general optical equation for remote sensing of suspended sediments in a moderately turbid estuary
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DOI：
10.1029/jc094ic10p14363
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发表时间：
1989-10
影响因子：
--
通讯作者：
R. Stumpf;Johnathan R. Pennock
中科院分区：
文献类型：
--
作者：
R. Stumpf;Johnathan R. Pennock
已经开发了一种用于确定河口表层沃茨悬浮泥沙浓度的通用算法，以供卫星数据使用。该算法使用了三参数的一般光学方程，悬浮泥沙浓度的水反射率已被纠正的太阳角度的影响，大气路径辐射，潮汐漂移。利用先进的甚高分辨率辐射计在五个不同日期收集的数据，使用两种不同的方法确定反射率，一种方法提供最大的雾度校正，另一种方法提供最小的颜料敏感度。对于这两种方法，在现场和遥感样品从特拉华州湾在3.5小时内获得对方同意在60%的95%的置信水平。像素和亚像素尺度的空间变化和变异性与原位测量产生约50%的差异。叶绿素浓度>50 μg/L时，反射率法会产生差异，从而提供最佳的雾度校正。可以调整参数值以允许沉积物尺寸和色素变化的变化，从而允许将校准应用于具有光学上不同的悬浮沉积物的河口。
A general algorithm for determining suspended sediment concentrations in the surface waters of estuaries has been developed for use with satellite data. The algorithm uses a three-parameter general optical equation to relate suspended sediment concentrations to water reflectances that have been corrected for sun angle effects, atmospheric path radiance, and tidal excursion. Using data collected by the advanced very high resolution radiometer on five different dates, reflectances were determined using two different methods, one providing maximum correction for haze and the other providing minimum sensitivity to pigments. For both methods, in situ and remotely sensed samples from Delaware Bay acquired within 3.5 hours of each other agreed to within 60% at the 95% confidence level. Pixel and subpixel scale spatial variations and variability associated with in situ measurements produced about 50% of the differences. Chlorophyll concentrations of >50 μg/L produced a discrepancy in the reflectance method that provided the best haze correction. The parameter values may be adjusted to allow for variations in sediment size and pigment variations, allowing application of the calibration to estuaries having optically different suspended sediments.