Monitoring the erosion of an expressway during its construction: problems and lessons |
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| Authors: | S J RILEY |
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| Institution: | School of Earth Sciences, Macquarie University , New South Wales , 2109 , Australia |
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| Abstract: | Abstract The large quantities of sediment eroded from the Sydney F3 Expressway extension and the lack of defined channels within the catchment presented several problems of discharge and sediment load sampling. The monitoring equipment at the catchment outlet, namely pump samplers and capacitance-based water level sensors, was computer controlled, but for partial area monitoring manual methods were used together with Gerlach traps and erosion pins. The monitoring at the catchment outlet was cost-effective because of the use of electronic equipment. The sampling strategies are described and recommendations for future sampling programs are presented. Coarse sand and silt-clay concentrations in many samples were more than 10 g 1?1 at the outlet. In some samples the silt-clay concentrations exceeded 30 g 1?1 and the coarse sand concentrations 100 g 1?1. |
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