黄河三角洲附近海域悬浮泥沙浓度估算

Estimation of Suspended Sediment Concentration in the Sea Water Near the Yellow River Delta

基于黄河口附近海域水体悬浮泥沙浓度及光谱信息同步测量数据,设计了使用MODIS Band1波段反射率进行悬浮泥沙浓度定量反演的模型。以MODIS产品MOD09GQ陆地反射率数据为数据源,进行了黄河三角洲附近海域悬浮泥沙浓度反演,获得了2009年夏季黄河入海口悬浮泥沙浓度分布图,结果表明:悬浮泥沙浓度分布的基本趋势是由岸向海逐渐降低,但在黄河入海口南北两侧浓度梯度表现出较大差异;浓度大于300 mg/L的悬浮泥沙主要分布在清水沟流路以南的莱州湾西岸,而黄河清8汊以北区域仅在特定潮流及天气情况下在河口以外区域有较宽分布;浓度为10～300mg/L的中、低浓度悬浮泥沙主要分布在入海口南侧莱州湾中部海域、高浓度悬浮泥沙分布区以外;浓度小于10 mg/L的极低浓度悬浮泥沙主要分布在上述区域之外远离岸线的地区。

A numerical model was designed to estimate the suspended sediment concentration with the MODIS Bandl reflectance data, and the model was based on the suspended sediment concentration data and sea water spectrum data measured synchronously in the estuary of the Yellow River. The MODIS product MOD09GQ land reflectance data was used to compute the sea water suspended sediment concentration, and as a result, we got the distribution maps near the Yellow River delta in the Summer of 2009. The results show that ： as a whole, the suspended sediment con- centration reduces gradually from the bank to the sea, but shows great different between south and north of the Yellow River mouth. The high concentration area with suspended sediment concentration greater than 300 mg/L mainly distributes in the region south to the Qingshuigou channel, and west to the Laizhou Bay bank. In the region north to the Qing 8 channel, only in specific tide and weather condition, will high concentration area appear. The medium and low concentration area distribute mainly to the south of the Yellow River moath, in the middle of Laizhou Bay. The suspended sediment concentration less than 10 mg/L mainly occurs outside the region mentioned above, mostly far away from the bank of the sea.