Remote Sensing Retrieval And Driving Factor Analysis Of Suspended Matter In Zhuhai's Coastal Waters

The quality of water environment is closely related to the development of human beings.For coastal cities like Zhuhai,coastal waters are the environmental foundation for economic development,transportation and other aspects.Therefore,it is particularly important to conduct periodic,high-quality water quality monitoring of coastal waters.Remote sensing technology has the advantages of large area,rapidity,periodicity and low cost.Whether it is used as a single monitoring method or complementary to traditional methods,it can produce significant benefits.In this paper,the coastal waters of Zhuhai City were selected as the research area.Based on the data of monitoring stations near Zhuhai City,the Sentinel-2 image data with high temporal and spatial resolution was used to construct the suspended soilds inversion model,which was based on the inversion results.Above,explore the characteristics of the temporal and spatial variation of the concentration of suspended soilds,and further explore the influence of wind field,tide,precipitation and other factors on the distribution of suspended soilds.The main research results of the thesis were as follows:(1)Through the correlation analysis and verification of Sentinel-2 images and the measured data,the study found that B5 in a single band and(B3+B5)/(B3+B4)in the combination of bands was the sensitive band of suspended soilds,which was determined based on this Developed a suspended solids inversion model suitable for the coastal waters of Zhuhai City;(2)Analysis of the characteristics of temporal and spatial changes in the distribution of suspended solids in the coastal waters of Zhuhai City from 2016 to 2020.From the time point of view,the seasonal changes in the distribution of suspended soilds wre obvious,and the summer was significantly higher than other seasons.In terms of space,the water quality near the shore(within about 10km)was poor.Within this range,the content of suspended solids was relatively high,and the overall spatial distribution characteristics were high near the shore and low at the far shore;(3)Analyze the influence of wind field,tide level,precipitation and other data on the temporal and spatial distribution of suspended soilds.The results showed that wind speed and wind direction will affect the distribution of suspended soilds concentration,and the critical value of wind speed on suspended soilds is 12km/h;the greater the water level,flow velocity,and monthly precipitation,the greater the impact on the distribution of suspended soilds.Large;human activities can change the direction of water flow,thereby changing the spatial distribution of suspended soilds.