Abstract
The watershed sediment delivery ratio (SDR) reflects the transport status of eroded soil in a watershed, and it is an important parameter in studying the relationship between basin erosion and sediment yield of rivers. This review study mainly focuses on China. Based on existing studies of the SDR, this study reviews and summarizes the definition, functions, influencing factors, and estimation methods, research suggestions and prospects of SDR. Results indicate that there are some differences in understanding the connotation of SDR. Influencing factors are extremely complex and can be attributed to both natural and anthropogenic factors. Estimation methods are various and can be summarized as one-factor, two-factor and multi-factor types. Most estimation methods are empirical regression equations based on hydrological data from specific watersheds and far from universal. Regional SDR modelling is still an important research tool for understanding watershed sediment transport in the future.
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