Voice Over • Documentaries
This is a Narration about Erosion and how it can affect the local environment.
Middle Aged (35-54)
Note: Transcripts are generated using speech recognition software and may contain errors.
erosion is a natural process that erodes the riverbank and riverbed and transports the material downstream. Natural rates of erosion are controlled by factors such as rainfall, bedrock and flow of water. As a natural process, it generally doesn't require intervention. Since 2015, the Kumara River has experienced severe erosion in the upper salt and lower freshwater reaches. Over a five year period, approximately 6000 cubic metres of sediment had eroded into the camera river. This is the equivalent of around 150 backyard swimming pools. Casuarina trees had fallen down the bank, taking large root balls of sediment with them. This exposed the bank to further damage. If the erosion was allowed to continue, this would result in a significant loss of land, and Kuma River could potentially break through into the lake. The solution was the Damien leading foreshore stabilization project. The foreshore was stabilised and restored using an innovative and natural solution, one of the first of its kind in estuarine river systems. In Australia, we saw us 96 large hardwood trees from a local development sites to be used for the natural structure. Recycling these trees for an environmental purpose was a great outcome for the project. They may otherwise have been chipped, but now they're used for natural fish habitats. These hardwood logs opposition on the riverbed along the foreshore. They protect the bank from both wash and allow mangroves grow behind the logs. The in stream structures achieve multiple outcomes. They protect the park, improve the water quality and the ecological health of the Kumara River. The area of foreshore being stable list was 450 metres long. 106 treated marine piles were driven into the riverbed by an excavator on the barge, the piles went to a depth of five and six metres. Hardwood tree logs were laid horizontally on the riverbed and were tied to the piles. The overall in stream structure reduces the water flow alongside the river bank, reducing erosion and protecting it. Re vegetation of the riparian zone along the foreshore from the top of the bank down to the intertidal zone is vital. It ties the whole project together. The roots of the plants bind the soil together. In the vertical bank, a special method of long stem planting was used. 800 native hibiscus is were grown to 80 centimetres long in the nursery and planted deep into the vertical bank. The top of the bank is planted with natives. Mangrove seedlings are growing on deposited sediment protected by the hardwood logs. Eventually, a mangrove forest will provide protection to the banks. From boat wash. The tree logs are providing habitat and fish can be seen feeding around logs. The stabilisation works will be monitored over the next five years. City of Gold Coast has successfully stabilised and eroding foreshore and at the same time created mangrove habitat and improved the long term river health. Over time, the logs and riparian re vegetation will become part of the river. They will provide ecological benefits to the whole Kumara River and southern Moreton Bay downstream in a city with more rivers and canals than Venice and Amsterdam combined. These projects maintained the ecology and health of our waterways, an important asset to our lifestyle. Yeah,
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