Relationships between soil detachment rate and flow sediment deficit with rill length on deforested and burned soil

IF 5.7 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena Pub Date : 2025-09-30 DOI:10.1016/j.catena.2025.109481

Misagh Parhizkar , Manuel Esteban Lucas-Borja , Nikolaos Tziolas , Yakov Kuzyakov , Demetrio Antonio Zema

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引用次数: 0

Abstract

The variability of soil detachment rate (D_r) with rill length is essential to understand the complex process of rill erosion. Moreover, an important variable of rill erosion, such as the ‘flow sediment deficit’ (FSD)–the difference in D_r between the two extreme points of a rill–has been scarcely investigated. Soil disturbances, such as fire and deforestation, strongly aggravate the natural rates of rill erosion, leaving the soil bare and unprotected by vegetation. Therefore, it is essential to explore and model how D_r and FSD depend on rill length in these land conditions. In this study, we have measured D_r and FSD in rills with length of 0.75, 1.5, and 2.5 m, using an experimental flume (3.5-m long) and soil samples collected in a burned and deforested site in Northern Iran. Soil slope and flow discharge were from 5.4 to 21.2 %, and from 0.55 to 0.94 L m⁻¹ s⁻¹, respectively. The highest D_r (on average 0.072 kg m⁻² s⁻¹) was measured at the upstream side of the rill (being equal to the maximum rate). Downstream of the rill, this rate was lower (by −64 % for a rill length of 0.75 m to −9.5 % for 2.5 m) and the minimum value (0.026 kg m⁻² s⁻¹) was measured for the shortest rill (0.75 m). D_r monotonically increased with slope and flow discharge for a given rill length. The variability rate of D_r can be estimated with very high precision by power equations, adopting the shear stress (Nash and Sutcliffe’s coefficient of efficiency, NSE, over 0.94) and stream power (NSE > 0.89) as input variables. Despite our study being limited by the small scale and the local soils, the results quantify the variability of D_r and flow sediment deficit along a rill in the experimental field conditions. The proposed equations are useful to predict these variables depending on rill length in physically-based erosion models in areas with climatic and geomorphological characteristics similar to the experimental sites.

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毁林和烧蚀土壤土壤分离速率和流沙亏缺与细沟长度的关系

土壤剥离速率随细沟长度的变化是了解细沟侵蚀复杂过程的必要条件。此外，一个重要的细沟侵蚀变量，如“流沙亏损”（FSD）——细沟两个极值点之间的Dr差——几乎没有被研究过。土壤扰动，如火灾和森林砍伐，大大加剧了溪流侵蚀的自然速率，使土壤裸露，没有植被保护。因此，有必要探索和模拟在这些土地条件下博士和消防处如何依赖于细沟长度。在这项研究中，我们使用一个实验水槽（3.5米长）和在伊朗北部一个烧毁和砍伐森林的地点收集的土壤样本，测量了长度为0.75米、1.5米和2.5米的小沟渠中的Dr和FSD。土壤坡度和流量分别为5.4% ~ 21.2%和0.55 ~ 0.94 L m−1 s−1。在细沟的上游测得最高的Dr（平均为0.072 kg m−2 s−1）（等于最大速率）。在细沟下游，这一比率较低（长度为0.75 m的细沟为- 64%，长度为2.5 m的为- 9.5%），而最短的细沟（0.75 m）的最小值为0.026 kg m−2 s−1。在一定的细沟长度下，Dr随坡度和流量的增加而单调增加。采用剪切应力（Nash and Sutcliffe’s coefficient of efficiency， NSE大于0.94）和水流功率（NSE > 0.89）作为输入变量，可以通过功率方程非常精确地估算出Dr的变化率。尽管我们的研究受到小尺度和当地土壤的限制，但结果量化了在试验田条件下沿细沟的Dr和流动泥沙亏缺的变异性。在气候和地貌特征与实验地点相似的地区，提出的方程有助于在基于物理的侵蚀模型中预测这些取决于细沟长度的变量。

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.