The characters of backscattering coefficient during flood period in Poyang Lake
LIU Yao1,2， YU Ziqiang2， FAN Jieping1， JIANG Hui 2， CHEN Xiaoling3
1.School of Resources Environmental & Chemical Engineering， Nanchang University， Key Laboratory of Poyang Lake Environment and Resource Utilization， Ministry of Education， Nanchang 330031，China；2.National and Local Joint Engineering Laboratory of Hydraulic Engineering Safety and Efficient Utilization of Water Resources in Poyang Lake Basin， Nanchang Institute of Technology， Nanchang 330099，China；3.State Key Laboratory of Information Engineering in Surveying， Mapping and Remote Sensing， Wuhan University， Wuhan 430079， China
Abstract：Backscattering is the key to obtain remote sensing information of optical active substances in lake. The turbid case II water， which is the main components of inorganic suspended particulates， has a decisive influence on the change of the optical properties of the water body. It is of great significance to research the backscattering characteristics of surface water body in improving the retrieval accuracy of optical active substances in lakes. In June 2017， 36 sites in Poyang Lake were monitored for cruise monitoring during the flood period. The characteristics of the backscattering parameters of the water and its relationship with optical active matters were analyzed. The backscattering coefficients were parameterized using an exponential model. The results show that the variation trend of backscattering coefficient and backscattering probability in the wavelength range of 420－700 nm are consistent with the wavelength， which both decrease with exponential power as the wavelength increases. The mean and amplitude of the backscattering parameters are spatially analyzed， which is southern lake district＞main lake district＞northern lake district. The correlation between the total suspended solids concentration and the backscatter coefficient during the flood period increases with the increase of wavelength， and the correlation at 700 nm is the best with the R2 of 0.760. However， the correlation between the Chlorophyll-a contents and the backscatter coefficient during the flood period decreases with the increase of wavelength. At the same time， the backscattering coefficient spectral model is established with the slope index of 1.229， which has good inversion accuracy at the wavelength of 470－700 nm with the mean absolute percentage error less than 8%.
刘 瑶,余自强,范杰平,江 辉,陈晓玲. 鄱阳湖丰水期水体后向散射特性研究[J]. 华中师范大学学报(自然科学版), 2019, 53(2): 283-289.
LIU Yao,YU Ziqiang,FAN Jieping,JIANG Hui,CHEN Xiaoling. The characters of backscattering coefficient during flood period in Poyang Lake. journal1, 2019, 53(2): 283-289.
2019, Vol. 53 
