基于MODIS影像的珠江口表层悬沙浓度反演及时空变化分析

MODIS images-based retrieval and analysis of spatial-temporal change of superficial suspended sediment concentration in the Pearl River Estuary

利用MODIS光谱数据，采用经验反演法，建立了珠江口悬浮泥沙浓度与MODIS第一波段反射率的指数反演模型，模型能较好地反演浓度介于0．014—0．3kg／m3珠江河口的悬浮泥沙浓度。在此反演模型的基础上，对珠江河口反演出来的不同时段的悬沙分布进行统计分析，结合对应时段的珠江来水来沙、潮汐及风场的统计数据，分析悬浮泥沙的空间分布及季节变化特征，进一步探讨了不同影响因素对珠江河口悬沙输运扩散的影响。

The spectral MODIS data was adopted to establish an exponential model between suspended sedi- ment concentration and the first band reflection by experiential retrieval method in the Pearl River Estuary in this paper. The model can retrieval suspended sediment concentration between0. 014 and 0.3kg/m3 relative accurately. Based on the model, combined with statistical data of the rate of flow and sediment,tide and wind in the Pearl River, the spatial distribution and seasonal variation characteristics of suspended sediment distri- bution were studied. Finally, influnees of different factors to diffusion and transport of suspended sediment in the Pearl River Estuary were discussed.