Print Email Facebook Twitter Sand wave dynamics Title Sand wave dynamics: Bedform analysis and dredging strategy design for South Channel, Melbourne, Australia Author De Koning, R.J. Contributor Aarninkhof, S.G.J. (mentor) Faculty Civil Engineering and Geosciences Department Hydraulic Engineering Programme Coastal Engineering Date 2017-01-27 Abstract The study into sand wave dynamics in South Channel has commenced after large dune forms were observed in monitoring campaigns following the channel deepening project of the Port of Melbourne. The project involved deepening of the harbour berths and channels, but more importantly, it involved the deepening of South Channel in Port Phillip Bay. South Channel, the main shipping channel, crosses the bay over a distance of ≈20km. The growth of bedforms at various locations in South Channel now threatens to impede marine traffic. The dimensions and migration rate of the bedforms in the channel are remarkable, especially in the harsh flow conditions in the narrow channel. Therefore, the bedforms in South Channel cannot be given an obvious classification. The first part of this thesis studies the hypothesis that the bedforms in South Channel can be classified as tidal sand waves. Tidal sand waves are large-scale bedforms generated by recirculating flow cells that drive sediment to the top of a crest, and are commonly observed on shallow coastal seas such as the North Sea. The second part of the thesis explores different dredging strategies for tidal sand wave fields and these are assessed for the case of South Channel. The classification analysis follows two different directions. First, the dimensions of sand waves found globally are compared to the dimensions found in South Channel. Secondly, the flow conditions in the channel are compared to the tidal sand wave flow regime as defined in literature. This bedform issue in the channel properly illustrates the necessity of an evaluation of the current, and alternative, channel maintenance strategies. A numerical model in Delft3D software is used to assess the different strategies. Though the results of the model are promising, they cannot be applied straightforwardly to assess the navigability of South Channel for the various strategies. A probabilistic approach is applied to combine the insights from the numerical model and the survey data to produce the probability of breaching the maintained depth for the different strategies. Subject sandwavesand wavesouth channelMelbournebedformdredgingpredictionclassificationmodellingdelft3d To reference this document use: http://resolver.tudelft.nl/uuid:e9abf2e8-5ecb-49f9-a7aa-ca4cd787fde4 Embargo date 2018-01-28 Part of collection Student theses Document type master thesis Rights (c) 2017 Koning, R.J. de Files PDF 20170118_MSc_Thesis_RJdeK ... _Final.pdf 24.48 MB Close viewer /islandora/object/uuid:e9abf2e8-5ecb-49f9-a7aa-ca4cd787fde4/datastream/OBJ/view