Articles | Volume 9, issue 1
Earth Surf. Dynam., 9, 1–18, 2021
Earth Surf. Dynam., 9, 1–18, 2021

Research article 08 Jan 2021

Research article | 08 Jan 2021

Groundwater erosion of coastal gullies along the Canterbury coast (New Zealand): a rapid and episodic process controlled by rainfall intensity and substrate variability

Aaron Micallef et al.

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Cited articles

Abotalib, A. Z., Sultan, M., and Elkadiri, R.: Groundwater processes in Saharan Africa: Implications for landscape evolution in arid environments, Earth-Sci. Rev., 156, 108–136, 2016. 
Abrams, D. M., Lobkovsky, A. E., Petroff, A. P., Straub, K. M., McElroy, B., Mohrig, D., Kudrolli, A., and Rothman, D. H.: Growth laws for channel networks incised by groundwater flow, Nat. Geosci., 2, 193–196, 2009. 
Aqualinc Research Limited: Canterbury groundwater model 2. Christchurch (NZ), Aqualinc Research Limited, L07079/1, 2007. 
Bal, A. A.: Valley fills and coastal cliff s buried beneath an alluvial plain: Evidence from variation of permeabilities in gravel aquifers, Canterbury Plains, New Zealand, J. Hydrol., 35, 1–27, 1996. 
Berger, G. W., Tonkin, P. J., and Pillans, B.: Thermo-luminescence ages of post-glacial loess, Rakaia River, South Island, New Zealand, Quaternary Int., 35/36, 177–182, 1996. 
Short summary
We study coastal gullies along the Canterbury coast of New Zealand using field observations, sample analyses, drones, satellites, geophysical instruments and modelling. We show that these coastal gullies form when rainfall intensity is higher than 40 mm per day. The coastal gullies are formed by landslides where buried channels or sand lenses are located. This information allows us to predict where coastal gullies may form in the future.