Summary
This literature review synthesises evidence on the causes and controlling factors of valley bottom gullies, which are particularly susceptible to erosion due to concentrated water flow. The authors demonstrate that whilst reclamation measures work well in arid and semi-arid environments with limited subsurface flow, similar interventions fail in humid regions where subsurface flow dynamics are not adequately addressed. The findings suggest an integrated landscape-level approach accounting for both surface and subsurface drainage is essential for effective gully rehabilitation in high-rainfall contexts.
UK applicability
Given the United Kingdom's predominantly temperate, humid climate with significant subsurface flow, findings regarding ineffectiveness of standard reclamation measures in such regions are directly relevant. UK land managers implementing valley bottom gully rehabilitation should adopt integrated drainage approaches rather than relying on conventional techniques developed for arid conditions.
Key measures
Gully location, initiation mechanisms, rate of gully advancement, effectiveness of reclamation measures by climate zone (arid, semi-arid, humid, subhumid)
Outcomes reported
The review identified watershed characteristics, rainfall, soil and bedrock properties, and subsurface flow as key determinants of valley bottom gully formation and progression. The study evaluated the effectiveness of existing rehabilitation measures across different climatic zones and highlighted deficiencies in approaches for humid regions.
Topic tags
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