(Dis)connectivity in hydro‐geomorphic systems – emerging concepts and their applications

Pöppl, Ronald; Polvi, Lina E.; Turnbull, Laura

doi:10.1002/esp.5574

Cited by 5 publications

(1 citation statement)

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“…The erosion mechanism and hydrological attributes of a convex slope exhibit notable distinctions when compared with those of a single slope (Shi et al, 2023). In recent years, researchers have come to recognize the interconnectedness of hillslopes and gullies in the hydrological processes of rainfall, runoff generation and sediment yield within a watershed (Fan et al, 2022;Poeppl et al, 2023). Consequently, studies focusing solely on either hillslope or gully features fail to capture the comprehensive erosion dynamics of the entire erosion system (Conti et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Vegetation pattern and topography determine erosion characteristics in a semi‐arid sandstone hillslope‐gully system

Zhu,

Yu,

Liu

et al. 2024

European J Soil Science

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The hillslope‐gully system serves as the primary contributor to both runoff and sediment yield. The WEPP (Water Erosion Prediction Project) model is often applied to investigate erosion characteristics at hillslope scale, demonstrating a high level of accuracy in simulating water erosion. In this study, according to in situ field monitoring (2014–2020) at a Pisha sandstone hillslope on the Loess Plateau, China, a total of 50 rainfall events’ data were used as climatic data to calibrate the soil parameters, and 11 different vegetation patterns and four slope gradients of hillslope‐gully systems were installed as inputs for the management and slope data, respectively. In systems A, B, C and D, the hillslope gradients were defined as 5°, 8°, 10° and 12° and the gully gradients as 15°, 20°, 25° and 30°, respectively. The results showed that the steeper the slope, the more severe the erosion. However, there was a critical value for the effect of slope on runoff. When the slope exceeded 8° and the gully exceeded 20°, the runoff no longer increased further and even decreased. The reduction in runoff in hillslope‐gully systems was in the following order (in mm): system D (3.4 ± 0.14) > system C (3.4 ± 0.14) > system B (3.39 ± 0.14) > system A (3.12 ± 0.13). Increasing vegetation cover could reduce erosion. Differences in runoff between vegetation patterns were not significant (p > 0.05) and ranged from 8% to 26%. However, there were significant differences in the sediment yield reduction benefits of different vegetation patterns (p < 0.05), ranging from 17% to 66%. It was observed that vegetation located in the lower slope produced a more pronounced effect in mitigating sediment when the degree of cover was the same. We conclude that implementing watershed management strategies based on the vegetation and topographic attributes of hillslope‐gully systems within the Loess Plateau, especially on Pisha sandstone hillslopes, serves as the fundamental approach to achieving sustainable watershed management.

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