Effects of event rainfall properties on permanent gully erosion on the Loess Plateau of China

IF 5.7 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena Pub Date : 2025-09-05 DOI:10.1016/j.catena.2025.109428

Suhua Fu, Ruoxin Liao, Guanghui Zhang

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引用次数: 0

Abstract

Permanent gully (PG) erosion is a critical form of soil degradation on the Loess Plateau of China, yet its response to individual rainfall events remains poorly understood. The purposes of this study were to investigate the influences of event rainfall properties on PG erosion and identify the most dominant factors of rainfall properties driving PG erosion on the Loess Plateau of China. Thirteen PGs were selected, and their elevations were measured by real-time kinematic with Global Navigation Satellite System in May 2023 and 2024 and after each erosive rainfall event. The key parameters reflecting PG evolution, including gully length, perimeter, projected area, erosion rate, deposition rate, were calculated from the established digital elevation model. The results showed that the maximum erosion rate of PG reached 683 t·ha⁻¹ in a single rainfall event, surpassing many reported annual erosion rates. The ratio of erosion from PG sidewall–floor to total erosion ranged from 91.2 % to 100 %, highlighting the dominant role of sidewall–floor erosion in overall gully erosion. PG erosion was significantly influenced by rainfall amount (P) and rainfall energy (E) at event scale. The antecedent rainfall over 3 or 5 days also importantly affected gully erosion. These findings enhance the understanding the influencing mechanisms of rainfall properties on PG erosion and contribute to land management strategies in erosion-prone regions.

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事件降雨特征对黄土高原永久沟蚀的影响

永久沟侵蚀是中国黄土高原土壤退化的一种重要形式，但其对个别降雨事件的响应尚不清楚。本研究的目的是探讨事件降雨性质对黄土高原PG侵蚀的影响，并确定降雨性质对中国黄土高原PG侵蚀的最主要影响因素。在2023年5月和2024年5月以及每次侵蚀性降雨事件发生后，利用全球导航卫星系统实时运动学测量了13个pg的高程。根据建立的数字高程模型，计算了反映PG演化的关键参数，包括沟长、周长、投影面积、侵蚀速率、沉积速率。结果表明，单次降雨事件中PG的最大侵蚀速率达到683 t·ha−1，超过了许多报道的年侵蚀速率。PG侧底板侵蚀占总侵蚀量的比例在91.2% ~ 100%之间，突出了侧底板侵蚀在整体沟蚀中的主导作用。事件尺度下降雨量(P)和降雨能(E)对PG侵蚀有显著影响。前期3 ~ 5天的降雨对沟道侵蚀也有重要影响。这些发现有助于进一步了解降雨特性对土壤侵蚀的影响机制，并为土壤侵蚀易发区的土地管理策略提供依据。

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.