茂名海域水体表层悬浮泥沙浓度时空分布特征的遥感分析

Remote Sensing Analysis of Spatial and Temporal Distribution Characteristics of Surface Suspended Sediment Concentration in the Maoming Sea Area

利用Gorden关系式,从茂名海域的多时相卫星影像定量反演了表层悬浮泥沙浓度的时空分布特征。经近期该海域实测悬沙资料验证表明,茂名沿海水体表层悬浮泥沙浓度偏低,一般低于200 mg/L;表层悬浮泥沙浓度在空间尺度上由岸向海呈带状分布,并逐渐降低,其中-1 m以浅区悬沙浓度最高,一般可超过100 mg/L,-10 m以深区浓度最低,一般低于20 mg/L。此外,沿海水体表层悬沙浓度往往在冬季高于夏季,大风天气高于平常天气。

In this paper, the Gorden relational expression is used to retrieve the spatial and temporal distribution characteristics of surface suspended sediment concentration in the Maoming sea area from satellite images, and the recent observed suspended sediment data in the sea area are used to verify the retrieval data. It is shown from the retrieval results that the surface suspended sediment concentration in the Maoming coastal area are lower, being lower than 200 mg/L in general; the surface suspended sediment concentration shows a banded distribution from shore to sea, and gradually decreases seaward, among them, that in water depths of less than 1 m is the highest, being higher than 100 mg/L in general, and that in water depths of greater than 10 m is the lowest, being lower than 20 mg/L. In addition, the surface suspened sediment concentration in the sea area is generally higher in winter than in summer, and higher in windy day than in normal day.