基于遥感反演结果的悬浮泥沙时空动态规律研究--以珠江河口及邻近海域为例

选择了珠江口及其邻近海域1995年~2000年152个时相的NOAA/AVHRR影像反演的悬浮泥沙浓度结果,通过对悬浮泥沙反演结果影像的叠加,求算叠加像素点像素平均值,计算了研究海域在1995~2000年间月、季及丰枯水期几个时间尺度上的悬浮泥沙平均浓度及其平均变化。结果大致表明了陆地径流对海域的影响范围和悬浮泥沙在海域的运动方向。

Spatial and Temporal Dynamics of Suspended Sediment Concentration in the Pearl River Estuary Based on Remote Sensing

In this paper, 152 suspended sediment concentration resulting images retrieved from reflectance of NOAA/AVHRR channel 1 (580 nm~690 nm) and channel 2 (720 nm~1 100 nm) in the Pearl River estuary and its adjacent coastal waters from 1995 to 2000 were selected to analyze the spatial distribution and variation of suspended sediment concentration in three temporal scales. The modeler of ERDAS IMAGINE ver8.5 was employed to calculate pixel based average concentration of suspended sediment according to the special time period and the regulation of spatial and temporal distribution and variation of suspended sediment concentration was studied. Results showed that obvious spatial distribution and temporal variation existed in all three temporal scales, concentration contours almost paralleled coastline and the values decreased from river mouth to open sea. The curvature and gradient implied the impact of run-off on suspended sediment along the coastal waters. The shift and convex of concentration contour basically directed the impact scope of run-off and the movement of suspended sediment along the coastal waters.