| 基于半分析方法的内陆湖泊水体总悬浮物浓度遥感估算研究 |
| 摘要点击 4334 全文点击 2917 投稿时间：2010-07-12 修订日期：2010-08-15 |
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| 中文关键词 总悬浮物 太湖 巢湖 生物光学模型 |
| 英文关键词 total suspended matter Lake Taihu Lake Chaohu bio-optics model |
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| 中文摘要 |
| 根据生物光学原理，通过对总悬浮物吸收占水体总吸收比例光谱的分析，确定适宜总悬浮物浓度反演的波段范围；结合以往学者对太湖等水体固有光学特性的研究成果，运用最小二乘法，确定生物光学模型的相关参数，建立了浑浊湖泊水体总悬浮物浓度的单波段估算模型.结果表明，在短波波段，总悬浮物的吸收占水体总吸收的比例较高，出现光饱和现象，不适合总悬浮物浓度的反演；在732～850 nm波段范围悬浮物吸收比例相对较小，是总悬浮物浓度反演的较适宜的波段范围.在该波段范围所建立的总悬浮物浓度单波段反演模型的平均相对误差低于24%，RMSE低于18 mg/L，其中反演效果最好的波段位于825 nm处.该方法反演总悬浮物浓度效果优于传统的经验算法. |
| 英文摘要 |
| According to the principles of bio-optics and the spectrum characteristics, the suitable remote sensing reflectance bands range for estimating TSM concentrations was determined based on the ratio of total suspended matter (TSM) absorption to the water absorption. Related bio-optics parameters were determined by using least squares technique and previous studies of the inherent optics parameters characteristics. And then the single band bio-optics models for inversing TSM concentrations in turbid waters were developed. Result shows: The remote sensing reflectance in short wavelengths are not suitable for inversion TSM concentration, because of light saturation resulting from high TSM absorption proportion correspond to the water total absorption. The remote sensing reflectance in the range of 732-850nm are appropriate for TSM concentration inversing during to the low TSM absorption proportion. The mean relative errors and RMSEs of the models developed by this study are below 24% and 18mg/L respectively, which indicate the good performance of this algorithm and the inferior to traditional empirical model. |
