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linear spectral unmixing algorithm for modelling suspended sediment concentration of flash floods,upper Tekeze River,Ethiopia

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International Journal of Sediment Research 2020年第1期35卷 79-90页

作者： Hagos G.Gebreslassie Assefa M.Melesse Kevin Bishop Azage G.Gebremariam Ethiopian Institute of Water Resources Addis Ababa University Department of NRM Adigrat University Department of Earth and Environment Florida International Universities Department of Aquatic Sciences and Assessment Swedish Universities of Agricultural Science

Flash floods are the highest sediment transporting agent,but are inaccessible for in-situ sampling and have rarely been analyzed by remote sensing *** and field experiments were done to develop linear spectral unmixing(LSU) remote sensing model and evaluate its performance in simulating the suspended sediment concentration(SSC) in flash *** models were developed from continuous monitoring in the laboratory and the onsite spectral signature of river bed sediment deposits and flash floods in the Tekeze River and in its tributary,the Tsirare *** Pearson correlation coefficient was used to determine the variability of correlations between reflectance and *** coefficient of determination(R2) and root mean square of error(RMSE) were used to evaluate the performance of the generated *** results found that the Pearson correlation coefficient between SSCs and reflectance varied based on the level of the SSCs,geological colors,and grain *** performance of the LSU model and empirical remote sensing approaches were computed to be R2=0.92,and RMSE=±0.76 g/1 in the Tsirare River and R2=0.91,and RMSE=±0.73 g/1 in the Tekeze River and R2=0.81,RMSE=±2.65 g/l in the Tsirare river and R2=0.76,RMSE=±10.87 g/l in the Tekeze River,***,the LSU approach of remote sensing was found to be relatively accurate in monitoring and modeling the variability of SSCs that could be applied to the upper Tekeze River basin.

关键词： Empirical remote sensing Flash floods linear spectral unmixing Suspended sediment concentration Tekeze River

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