TAN Yuning, LIU Huaixiang, LU Yongjun. Factors controlling sediment yield and prediction of ungauged areas in the Lower Jinsha River basin[J]. Advances in Water Science, 2023, 34(2): 277-289. DOI: 10.14042/j.cnki.32.1309.2023.02.011
Citation: TAN Yuning, LIU Huaixiang, LU Yongjun. Factors controlling sediment yield and prediction of ungauged areas in the Lower Jinsha River basin[J]. Advances in Water Science, 2023, 34(2): 277-289. DOI: 10.14042/j.cnki.32.1309.2023.02.011

Factors controlling sediment yield and prediction of ungauged areas in the Lower Jinsha River basin

  • Recent installment of cascade reservoirs in the Lower Jinsha River basin urges quantitative studies of sediment inflows from ungauged tributaries and sediment pattern in this basin.Based on existing observations from 18 gauging stations and a multi-factor dataset, the Spearman rank correlation analysis was used to examine the responses of sediment yield to potential controlling factors at the catchment scale.Dimensionality reduction and regression methods were integrated to identify different sets of factor variables for predicting specific sediment yield (SSY).The results show that proportion of slopes over 8°, temperature and catchment area together can best describe the regional mechanism of sediment yield, and the obtained model explained 92% of SSY variability.The estimated SSY of ungauged areas varied from 87 t/(km2·a) to 1 189 t/(km2·a) and has reduced by 50—300 t/(km2·a) over the past 50 years.This research detected both high-yield and low-yield tributaries in the Baihetan and Xiluodu reservoirs, as well as the declining trend of SSY spatial heterogeneity.
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