Slope effects on soil moisture migration and evolution in shallow layers of loess high-fill slopes in the Gully Land Consolidation

IF 5.4 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena Pub Date : 2025-06-12 DOI:10.1016/j.catena.2025.109206

Han Bao , Chenlin Ji , Hengxing Lan , Han Zheng , Changgen Yan , Jianbing Peng , Langping Li , Juntian Wang , Guanmiao Guo

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引用次数: 0

Abstract

Many loess high-fill slopes have been constructed in the Loess Plateau of China, which are susceptible to shallow diseases and disasters owing to water migration and evolution. The existence of a slope surface profoundly affects soil moisture dynamics, thus potentially altering the slope instability. According to long-term, multi-point, and multi-depth on-site monitoring, shallow soil moisture’s migration and evolution characteristics under slope effects were investigated. The influence of the microtopography on the slope effects is also clarified. The results showed that the characteristics under sloped conditions significantly differed from those under flat terrain conditions. During water infiltration and redistribution, the sloping topography shifts the depth of influence of rainfall infiltration downward; the lateral flow duration and the peak of the change rate of moisture content (CRMC) at the slope step were significantly smaller than those at the slope face. During the drainage stage, the slope effect enhances the draining capacity and range of soil layers, with the slope step exhibiting greater draining efficiency. Besides, the slope effect reduces the magnitude and amplitude of soil water potential gradients (SWPG), thereby weakening the intensity of driving force evolution. Among the factors influencing the slope effect, large rainfall events and root plant development promote the slope effects, whereas high initial water content and shallow groundwater tend to suppress it. These findings are of great significance for advancing the understanding of slope soil moisture migration patterns and ensuring the stability of shallow slope layers.

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坡面效应对沟壑区黄土高填方边坡浅层土壤水分迁移演化的影响

中国黄土高原已建成许多黄土高填方边坡，由于水分的迁移和演化，易发生浅层病害和灾害。边坡表面的存在深刻地影响着土壤水分动力学，从而可能改变边坡的失稳。通过长期、多点、多深度的现场监测，研究了边坡作用下浅层土壤水分的迁移演化特征。阐明了微地形对边坡效应的影响。结果表明，坡地条件下的特征与平坦条件下有显著差异。在水分入渗和再分配过程中，坡面地形使降雨入渗的影响深度向下移动；坡阶侧流持续时间和含水率变化率峰值均显著小于坡面侧流。在排水阶段，坡面效应增强了土层的排水能力和排水范围，坡面台阶的排水效率更高。此外，坡度效应降低了土壤水势梯度（SWPG）的大小和幅度，从而减弱了驱动力演化的强度。在影响边坡效应的因素中，大降雨事件和根系植物发育促进了边坡效应，而高初始含水量和浅层地下水往往抑制了边坡效应。这些研究结果对于进一步认识坡面土壤水分迁移规律，保障坡面浅层稳定性具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Catena 环境科学-地球科学综合

CiteScore

10.50

自引率

9.70%

发文量

816

审稿时长

54 days

期刊介绍： Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.