Alluvium

Alluvium, 2020
A film by Erin Coates
Composed by Stuart James
Percussion performed by Louise Devenish
HD video with sound
9:30 minutes

In the film Alluvium, Coates brings a visceral drama to the biology of the Derbarl Yerrigan, a salt wedge estuary flowing through Boorloo (Perth). The film alludes to the complex hydrodynamics, biology and chemistry of the river and the ways these have been changed in the 200 years since the establishment of the Swan River Colony. Nutrient loading caused by run-off from residential fertilisers and upstream agriculture increase the phosphorus and nitrogen in the water, thus promoting algal blooms and low oxygen conditions. The shellfish reefs were dredged from the river and invasive species like the white colonial sea squirt (Didemnum perlucidum) and mermaid’s hair (Lyngbya) compete with native sea grasses. In recent years there have been unusual mortality events among the resident dolphin population. The dolphins showed signs of tattoo skin disease (Cetacean Morbillivirus), a virus that causes circular skin lesions. Alluvium provides a dark speculation on the transformation of river ecosystems while highlighting the fecundity and resilience of life forms within this urban waterway. 

Percussionist Louise Devenish and composer Stuart James have created a musical score for this film, by exploring the instrumental potential of Coates’ oyster shell and metallic sculptures.

Alluvium was created is a part of the Alluvial Gold project, commissioned by Goolugatup Heathcote for their Tilt residency and exhibition program, with support from the Government of Western Australia through the Department of Local Government, Sport and Cultural Industries.