Response of Hydrodynamic Characteristics to Tillage-Induced Microtopography of Rill Erosion Processes under Heavy Rainfalls

Shuqin He, Jian Luo, Zicheng Zheng (), Wenfeng Ding and Jigen Liu
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Shuqin He: College of Forestry, Sichuan Agricultural University, Chengdu 611130, China
Jian Luo: College of Resources Science, Sichuan Agricultural University, Chengdu 611130, China
Zicheng Zheng: College of Resources Science, Sichuan Agricultural University, Chengdu 611130, China
Wenfeng Ding: Key Laboratory of River and Lake Control and Flood Control of the Middle and Lower Reaches of the Yangtze River, Ministry of Water Resources, Wuhan 430010, China
Jigen Liu: Key Laboratory of River and Lake Control and Flood Control of the Middle and Lower Reaches of the Yangtze River, Ministry of Water Resources, Wuhan 430010, China

Land, 2024, vol. 13, issue 5, 1-15

Abstract: The occurrence and development of rill erosion depends on the hydraulic characteristics of water flow and underlying soil surface features. Our experiments include one-rainfall-intensity treatments (2.0 mm min −1 ) and various microtopographic levels based on different tillage practices with smooth slope (CK), artificial digging (AD), and ridge tillage (RT) on a 15° slope. The results indicate the following: (1) The soil roughness index values were in the order of CK < AD < RT, and the spatial variability of different tillage practices had strong autocorrelations during different rill erosive stages. The codomain values decreased with the increase in microtopography. (2) The multifractal dimension values of tillage practices in various erosive stages were in the order of RT > AD > CT. The microtopography of different tilled slopes showed strong multifractal characteristics, and the multifractal characteristics were stronger as the microrelief heterogeneity increased. For the CK slope, the generalized fractal dimension span (ΔD) ranged between 0.0019 and 0.0058. For the AD slope, ΔD was between 0.2901 and 0.5112. And, for the RT slope, ΔD was between 0.4235 and 0.7626. (3) With the evolution of rill erosion, the flow pattern on different tilled slopes changed from subcritical transition flow to supercritical transition flow. (4) Soil roughness index and ΔD had good correlations with hydrodynamic parameters. The stronger the erosive energy of runoff was, the higher the spatial heterogeneity of microtopography was. This study is expected to provide a theoretical basis for revealing the hydrodynamic mechanism of rill erosion in slope farmland.

Keywords: rill erosion; microtopography; hydrodynamics; purple soil areas (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2024
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