Estimating streamflow using remote sensing:Progress and prospects
Streamflow data provide vital information for research on hydrology and water resources,as well as for the design of water conservancy and hydropower projects.The lack of streamflow data is an important limiting factor that researchers in the field of hydrology have tried to address in the past decades.Streamflow estimation based on satellite data is an effective way to solve this problem,and it is an important topic for interdisciplinary research on quantitative remote sensing and hydrology.This paper summarizes the current research status of remote sensing inversion methods for hydraulic variables closely related to streamflow,including water surface width and water surface elevation.The research progress of mathematical methods of streamflow estimation based on satellite observations,such as establishing empirical relationships and integrating information with hydrological or hydrodynamic models,is described.The error evaluation of streamflow estimates,increasing observation frequency by multi-satellite collaboration,and the applicability of inversion method are discussed,are the factors that have hindered research into streamflow estimation based on remote sensing.Trends for future studies are elaborated and potential applications for streamflow estimation based on remote sensing are proposed.
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