基于遥感技术对黄河口水色与岸线季相变化特征研究

使用Landsat-5 TM 2004年11月24日与2005年5月13日黄河口遥感影像,配合准同期外业实测资料,进行黄河口水体水色物质叶绿素a与悬浮泥沙的动态反演与河口岸线解译.研究表明由于秋末与春初黄河上游来水物质含量的差异,上述悬浮指标值存在显著的季相差异.根据样值与光谱特征建立的反演模型得出的反演值与实测值有平均在0.85以上的相关关系,具有很好的反演效果.岸线解译成果表明,黄河口岸线演变迅速,在河流平枯水量时期仍然具有较强的变化,岸线推进尤以新河口附近显著.这表明,使用遥感手段是进行河口生态环境质量监测的有效手段,是进行岸线动态变化研究的一种基本技术支撑手段.

A Study of the Seasonal Variation of Water Color Concentration and Coastal Line of the Yellow River Estuary Based on RS

Using Landsat-5 TM images of the Yellow River Estuary on November 24. 2004 and May 13. 2005, with quasi-synchronous practical measured data, dynamic inversion was performed for the change of suspended sediment and chlorophyll a in the waters of the study area, and its coastal line was then interpreted. The results showed that there were distinct seasonal differences in the suspended materials due to difference in water quality between late autumn and early spring. The mean of the correlation coefficients between measured data and spectral signature values of every image was 0.85, which implied that the inversion was successful. The result of interpreting coastal line showed rapid alteration of the Yellow River Estuary, which even occurred in a short term during low or median water level period. The advance of the coastal line was remarkable on the south shore beside Laizhou Bay. The study shows that using the RS method is suitable in investigating environment change and the variation of coastal line of the Yellow River Estuary.