Study on statistical model of sub-rainfall runoff sediment yield based on the concept of physical genesis in Kuye river basin

doi:10.14088/j.cnki.issn0439-8114.2021.03.006

Abstract

Abstract: Soil erosion is serious in the gully area of Loess Plateau. In recent years, environmental changes have led to a sharp decrease in runoff and sediment in the Yellow river basin. So, it is of great significance to establish sediment yield model in the basin for the study of erosion sediment yield. In the Kuye river basin, double accumulation curve, cumulative departure curve and multivariable nonlinear regression method were applied to study the variation trend of water and sediment using hydrologic and sediment data from 1961 to 2016, and empirical models of flood aquatic product sediment in different periods were established in the basin under cushion. The results showed that the determination coefficient of the models in different periods were all more than 0.9 and the average relative error was about 30%. By simulating the field floods with different sediment yield levels in different periods, it was found that the relative error of model simulation gradually decreased with the increase in sediment yield level, and the simulation effect of model on large sediment yield events was better than that of small sediment yield events. The simulation results showed that the model performance in heavy rain was slightly better than that in medium and light rain.

Key words: the underlying surface in different periods, sediment yield, nonlinear regression, statistical model, Kuye river basin

CLC Number:

P333.4

SU Ting-ting, WU Zhi-yong, HE Hai, SUN Zhao-min. Study on statistical model of sub-rainfall runoff sediment yield based on the concept of physical genesis in Kuye river basin[J]. HUBEI AGRICULTURAL SCIENCES, 2021, 60(3): 31-37.

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