IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Managing deltas : Estuary dynamics and responses to environmental flow releases
Estuary dynamics and responses to environmental flow releases
Author : CHRISTINE LAUCHLAN ARROWSMITH(1), ANDREW MCCOWAN(2)
ABSTRACT
Environmental flow releases are used to provide targeted river flows to meet ecologically important physical outcomes. For
an estuary, these river flows can impact water levels as well as salinity conditions. Recent environmental flow releases
have been undertaken for the Latrobe River estuary system to address the water requirements of the estuary ecology as
well as that of the adjacent wetlands. The Latrobe River estuary connects the catchments of the Thomson, Macalister and
Latrobe Rivers with the Gippsland Lakes. The ecological conditions of this estuary system has been significantly impacted
by water resource development within the catchments as well as changes to the salinity regime of the Lakes as a result of
a permanent artificial entrance to the ocean being constructed in the late nineteenth century. An environmental flows study
established a series of environmental objectives and flow recommendations for the estuary which focused on freshwater
inflows to manage salinity. Based on the flow recommendations, environmental flow releases aimed at meeting ecological
requirements were made during 2014. The impact and effectiveness of these flow releases was assessed through an
extensive physical monitoring program which recorded salinities, water levels and flows throughout the estuary. The results
of the monitoring show that environmental water released from upstream reservoirs can have a measurable short term
impact on salinity conditions in the estuary; however the duration and magnitude of the releases may limit longer term
ecological responses. Combining the knowledge gained during the monitoring program with the ecological requirements of
the estuary and wetlands, designs have been developed for regulating structures to maximize the benefits of environmental
flows.
File Size : 5,941,741 bytes
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Managing deltas
Date Published : 19/08/2015
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