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| DOI：10.13522/j.cnki.ggps.2022220 |
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| Influence of Rock Fragments on Subsurface Hydrological Processes: Progresses and Perspectives |
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SU Zhiran, GUO Jiawei, ZHANG Jinhao, NIU Chenyu, ZENG Qijie, ZHANG Zhihua
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College of Forestry, Henan Agricultural University, Zhengzhou 450002, China
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| Abstract: |
| 【Objective】Rock fragments are ubiquitous in soil, especially in arid and semi-arid regions. They have a considerable influence on various subsurface hydrological processes. Understanding the impact of rock fragments on these processes is crucial for improving water resource management, ecosystem restoration and sustainable development. 【Method】This paper reviews the research over the past decades on the influence of rock fragments on subsurface hydrological processes, highlighting the challenges and limitations we currently face and proposing potential research perspectives. Specifically, we analyze the effects of characteristic parameters of rock fragments, such as their coverage, content, and size, on water infiltration, surface runoff and subsurface flow, preferential flow and soil evaporation. We also review progress in mathematical models used to simulate and quantify the effects of rock fragments on subsurface hydrological processes. 【Result】Our review reveals that the mechanisms underlying the influence of rock fragments on subsurface hydrological processes remain obscure, and current methods are unable to capture the complex causal relationship between rock fragments and soil hydrological processes. Areas such as quantification of rock fragment heterogeneity and its association with soil hydrological parameters, multi-scale modelling of soil hydrological processes are still in the infant stage and require further work. 【Conclusion】We propose that developing innovative technologies and methodologies, and improving understanding of the underlying mechanisms are particularly important in future research. Specifically, future research should focus on characterizing rock fragments in deep soil and their influence on hydrological process and formation of preferential flow, methods to link gravel content to hydrological information at different scales. Improving research in these areas will advance our in-depth understanding of the impact of rock fragments on soil hydrological processes, helping develop sustainable water resource management in arid and semi-arid regions. |
| Key words: rock fragments; infiltration; runoff; subsurface flow; preferential flow; evaporation |
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