期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 879, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2023.163090
关键词
Sediment transport capacity; Soil properties; Overland flow; Soil erosion; The Loess Plateau
The study aimed to investigate the variations of sediment transport capacity by overland flow (Tc) with respect to soil properties and establish a universal relationship for predicting Tc. The results showed that Tc significantly decreased with clay content, mean weight diameter, and soil organic matter content. Tc for different soil types increased with slope gradient and flow discharge, with slope gradient having a greater impact. Stream power was found to be the most appropriate hydraulic variable for expressing Tc. A quaternary power function or a ternary power function could satisfactorily simulate Tc for different soil types.
The sediment transport capacity by overland flow (Tc) is a key parameter in process-based soil erosion models and Tc variation is sensitive to changes in soil properties. This study was undertaken to investigate Tc variations with respect to soil properties and establish a universal relationship to predict Tc. The test soils were collected from typical agricultural regions (Guanzhong basin-Yangling (YL), Weibei Dry plateau-Chunhua (CH), Hilly and gully region-Ansai (AS), Ago-pastoral transition zone along the Great Wall-Yuyang (YY), and Weiriver floodplain-Weicheng (WC)) of the Loess Plateau, and subjected to 36 different combinations of slope gradients (S, 5.24-44.52 %) and flow discharge (q, 0.00033-0.00125 m2 s-1) in a hydraulic flume. The results showed that the mean Tc values for WC were 2.15, 1.38, 1.32, and 1.16 times greater than those for YL, CH, AS, and YY, respectively. Tc significantly decreased with clay content (C), mean weight diameter (MWD), and soil organic matter content (SOM). Tc for different soil types increased with S and q as a binary power function, and Tc variation was more sensitive to S than to q. Stream power (w) was the most appropriate hydraulic variable to express Tc for different soils. Tc for different soil types could be satisfactorily simulated using a quaternary power function of S, q, C, and MWD (R2 = 0.94; NSE = 0.94) or a ternary power function of w, C, and MWD (R2 = 0.94; NSE = 0.94). The new Tc equation can reflect the effect of soil properties on it and facilitate the development of a process-based soil erosion model.
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