DISCHARGE ESTIMATION OF BRANCHED FLOW IN DELTA REGION USING MODIS REFLECTANCE DATA

Tung Duc VU, Hiroshi ISHIDAIRA
2018 Journal of Japan Society of Civil Engineers Ser B1 (Hydraulic Engineering)  
Discharge information is a key component in understanding the hydrological regime of delta regions and developing coastal management. Although its importance is recognized, many delta regions collect limited discharge data due to the complexity of river flow and the lack of gauging stations. In this study, we investigated the potential of using Moderate Resolution Imaging Spectroradiometer (MODIS) reflectance data to estimate discharge in the branched flow of the Red River Delta (RRD). We
more » ... ted data from MODIS Band 1 (620-670 nm, 250 m resolution) for the location of the in-situ station and applied regression analysis to confirm a positive relationship between suspended sediment concentration (SSC) and the reflectance of the river water surface (R). The regression coefficient β and water balance equations were used to calculate discharge in the branched flow and then compared to observation data. The results revealed a close relationship between monthly average SSC and R. Discharge was reasonably simulated with a Spearman's correlation coefficient of 0.76 at Thuong Cat (TC) by using R as a parameter, with some overestimation. We discuss possible error sources in this proposed method and their potential effects on estimated results.
doi:10.2208/jscejhe.74.i_985 fatcat:5zxp3ybbnffchadvsvwdqlfc5u