Changes in sediment connectivity and its impact on sediment transport in a typical watershed of Southern Jiangxi Province, China

IF 7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Ecological Indicators Pub Date : 2025-02-01 DOI:10.1016/j.ecolind.2025.113204

Fei Sheng , Tingxin Yi , Yanyan Wang , Haijin Zheng , Shiyu Liu , Xiaofei Nie , Longsong Hu , Haifeng Li

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引用次数: 0

Abstract

Sediment connectivity is a crucial factor in determining the mode, efficiency, and scale of sediment transport. However, changes in sediment connectivity and their impact on sediment transport in southern Jiangxi Province, China, remain unclear. Consequently, the Lianshui watershed in southern Jiangxi Province was selected as the study area for this research. Using hydrometeorological and land use data from 1992 to 2023, this study examines variations in sediment connectivity and sediment transport eigenvalues within the watershed. It also investigates the hysteresis relationship between runoff and sediment under single rainstorm conditions and assesses the impact of changes in sediment connectivity on sediment transport. The findings revealed that the mean index of sediment connectivity (IC_mean) in the watershed from 1992 to 2023 exhibited a highly significant upward trend. The IC_mean for each land use type increased significantly, with the IC_mean for other woodland changing dramatically. The hotspot area of the index of sediment connectivity (IC) showed significant spatial expansion. The annual sediment yield (S), sediment yield modulus (S_SY), sediment yield coefficient (C_s), 3-year and 5-year moving average sediment yield (S_3a, S_5a) all increased significantly from 1992 to 2023. Under single rainstorm conditions, the proportion of each runoff-sediment loop curve varied greatly across different periods. The highest proportion of counterclockwise and figure-eight curves was found during the periods 2001–2008 and 2009–2023, at 35.3% and 54.0%, respectively. These changes were closely related to the location and quantity of sediment sources caused by the large-scale development of orchards in the watershed. The interpretation of IC_max to the changes in S_3a and S_5a was 51.5%, indicating a highly significant effect. This suggests that alterations in sediment connectivity play a crucial role in sediment transport processes. The research results provide a scientific basis for controlling soil erosion and optimizing land use allocation in the watershed.

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来源期刊

Ecological Indicators 环境科学-环境科学

CiteScore

11.80

自引率

8.70%

发文量

1163

审稿时长

78 days

期刊介绍： The ultimate aim of Ecological Indicators is to integrate the monitoring and assessment of ecological and environmental indicators with management practices. The journal provides a forum for the discussion of the applied scientific development and review of traditional indicator approaches as well as for theoretical, modelling and quantitative applications such as index development. Research into the following areas will be published. • All aspects of ecological and environmental indicators and indices. • New indicators, and new approaches and methods for indicator development, testing and use. • Development and modelling of indices, e.g. application of indicator suites across multiple scales and resources. • Analysis and research of resource, system- and scale-specific indicators. • Methods for integration of social and other valuation metrics for the production of scientifically rigorous and politically-relevant assessments using indicator-based monitoring and assessment programs. • How research indicators can be transformed into direct application for management purposes. • Broader assessment objectives and methods, e.g. biodiversity, biological integrity, and sustainability, through the use of indicators. • Resource-specific indicators such as landscape, agroecosystems, forests, wetlands, etc.