Effects of road and river networks on sediment connectivity in mountainous watersheds

Jing, Yaru; Zhao, Qinghe; Lu, Mengwen; Wang, An; Yu, Jinhai; Liu, Yi; Ding, Shengyan

doi:10.1016/j.scitotenv.2022.154189

Cited by 19 publications

(11 citation statements)

References 61 publications

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“…In the GDM and the RF model, the D ‐factor had a higher spatial explanatory power on connectivity than the k , β , and γ factors. Nevertheless, the effects of the k ‐factor and β ‐factor on connectivity were still significant, a conclusion that aligns with observations of the significant impact of river network structure on connectivity within the Dongshuanghe watershed (Jing et al, 2022).…”

Section: Discussionsupporting

confidence: 87%

“…The significant impacts of river network structure characteristics on connectivity serve as essential drivers in connectivity‐related studies (Jing et al, 2022). The high explanatory power of D on both hydrological and sediment connectivity, particularly at the heart of the Jinghe River Basin, as demonstrated in Figures 7 and 8.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, considering the spatial-temporal characteristics of sediment connectivity, the role of forestland and grassland can be taken into consideration when constraining sediment risk, especially in mountainous and hilly gully areas (Figure 9). The significant impacts of river network structure characteristics on connectivity serve as essential drivers in connectivity-related studies (Jing et al, 2022). The high explanatory power of D on both hydrological and sediment connectivity, particularly at the heart of the Jinghe River Basin, as demonstrated in Figures 7 and 8.…”

Section: Influencing the Factor Analysismentioning

confidence: 98%

“…Moreover, the structure of the river network greatly dictates the transition of runoff and sediment. According to Jing et al (2022), the influences of river and road network structure on sediment connectivity were found to be significant and effective. Zhao et al (2022) considered the response variables such as river network structure and topography, revealing that changes in flow length significantly affected sediment connectivity, thereby offering an advantage in identifying sediment transport paths.…”

Section: Introductionmentioning

confidence: 99%

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Elucidating the response mechanisms of hydrological and sediment connectivity to the river network structure, vegetation, and topographic features in the Jinghe River Basin

Liu,

Wu,

Guo

et al. 2024

Land Degrad Dev

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The management of basin water and soil resources greatly benefits from investigating the spatial changes and primary determinants of hydrological and sediment connectivity from perspectives of topographic features, vegetation characteristics, structural features of river networks. However, quantifying the effects of influencing factors and their interactions on connectivity is still a challenge in the field of studies of surface processes. To address this challenge, we applied the geographical detector model (GDM) and random forest (RF) to quantify the relative importance and explanatory power of topographic factors, vegetation features, and river network structure on the hydrological connectivity and sediment connectivity and to clarify the interaction mechanism of various factors in the Jinghe River Basin. Results indicate that from 2005 to 2020, the mean value of hydrological connectivity (ICH) witnessed a decreasing trend from −5.47 to −5.58. Similarly, the mean value of sediment connectivity (ICS) declined over the same period from −9.74 to −10.05, with high values registered in valleys and low values in plains. The river density (D) and hydrological weight factor (normalized SCS‐CN) exhibited a greater spatial explanatory power on ICH than other parameters, reaching 0.149 and 0.182, respectively. The vegetation factor (0.299) and sediment weight factor (0.410) manifested considerably more influence over ICS. Spatial integration between relevant elements can enhance our understanding of basin connectivity. Interactions between vegetation, topography, and river network structure provide more explanatory power compared to interactions among same‐type features. Ultimately, this study offers a theoretical template for understanding the management of soil and water resources in the Jinghe River Basin, as well as the spatial variability in soil erosion.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Influencing the Factor Analysismentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Elucidating the response mechanisms of hydrological and sediment connectivity to the river network structure, vegetation, and topographic features in the Jinghe River Basin

Liu,

Wu,

Guo

et al. 2024

Land Degrad Dev

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“…However, the effect of roads on UCA will not always be significant, and there is a certain threshold beyond which the interception effects of roads are diminished [52,[54][55][56][57]. In this study, the influence of roads on FA and UCA may be effective in the 180 m buffer zones, which is consistent with Marcantonio et al [55] who found that the effect of roads was observed up to 200 m into the forest, and Jing et al [58] who reported that the effect of roads on improving sediment delivery rates and IC gradually diminished beyond a threshold of 150 m. It is worth noting that we did not try to identify a specific threshold for the effect of roads on these specific processes, given that they are complex processes that are controlled by a wide range of factors, including not only the road itself but also the topography, soil, vegetation, rainfall, and land use at different spatial and temporal scales [55][56][57]. Additionally, the response of different factors to road networks should vary [51,54]; however, to date, little research has focused on the influence of particular distance thresholds on confluence processes.…”

Section: Convergence Processes Altered By Forest Roadssupporting

confidence: 87%

Response of Sediment Connectivity to Altered Convergence Processes Induced by Forest Roads in Mountainous Watershed

et al. 2022

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Forest roads significantly affect sediment connectivity in mountainous catchments by contributing to the production of and disturbing the confluence of sediment-loaded runoff. This study considered forest roads as pathways and sinks of sediment-loaded runoff to understand the effects of forest roads on the confluence characteristics and sediment connectivity in mountainous a catchment using a scenario simulation. In order to determine the contribution and spatial relationship between sediment connectivity and influencing factors, this study utilized buffer analysis, an extremely randomized tree model, and multiscale geographically weighted regression. The results show that the presence of forest roads significantly changes the transport process and connectivity of runoff and sediment in the mountainous catchment. Specifically, flow length increases, but flow accumulation, upslope contributing area, and topographic index decrease with increasing distance from roads and streams. Meanwhile, the effects of roads on convergence characteristics and sediment connectivity are mainly manifested within a certain threshold that varies with different confluence characteristics. Moreover, sediment connectivity increases when considering roads as pathways and sinks of sediment-loaded runoff, especially on the upper hillslopes intercepted by roads and at the road–stream crossings. In addition, the closer the distance to the roads, the greater the impact of road on the confluence characteristics and sediment connectivity. Change in flow length is the most important factor affecting the sediment connectivity among all of the other convergence, terrain, and spatial distance characteristics. The longer the flow length, the lower the sediment connectivity. In conclusion, this study demonstrates that the altered confluence processes by roads increases the possibility that sediment-loaded runoff will be transported to the catchment outlet, which is of significance for the proper management of forest roads in mountainous catchments.

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Soil erosion associated with roads—A global review and statistical analysis

Yu,

Zhao,

Liu

et al. 2024

Land Degrad Dev

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Global soil degradation due to road erosion is an escalating concern. This study employed bibliometric analysis using the Science Citation Index‐Expanded dataset to gain insights into research trends in road erosion. It covered the years 2000–2021, revealing a steady increase in annual research publications, particularly after 2018. The United States and Catena was the leading contributor and the most popular journal, respectively. The primary research areas identified by keywords and statistical analysis are the forests and arid regions in the temperate climate zone (including temperate continental climate and temperate monsoon climate) and the tropical climate zone (including tropical rainforest climate and tropical monsoon climate). Since 2012, a noticeable shift from traditional methods to emerging technologies like isotope tracing (e.g., 137Cs, 210Pb) and machine learning (e.g., random forest) was observed, indicating evolving in methodologies with changes in research scales. The study emphasized the inevitability of road erosion, highlighting the crucial role of effective road management and restoration. It proposed integrating best management practices and ecosystem restoration strategies into watershed management, combined with advanced technological approaches, to foster sustainable watershed development.

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Effects of road and river networks on sediment connectivity in mountainous watersheds

Cited by 19 publications

References 61 publications

Elucidating the response mechanisms of hydrological and sediment connectivity to the river network structure, vegetation, and topographic features in the Jinghe River Basin

Elucidating the response mechanisms of hydrological and sediment connectivity to the river network structure, vegetation, and topographic features in the Jinghe River Basin

Response of Sediment Connectivity to Altered Convergence Processes Induced by Forest Roads in Mountainous Watershed

Soil erosion associated with roads—A global review and statistical analysis

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