Skip to content

Research at St Andrews

Predicting fluvial-deltaic aggradation in Lake Roxburgh, New Zealand. Test of a Water and Sediment Routing Model

Research output: Chapter in Book/Report/Conference proceedingChapter


School/Research organisations


Sedimentation upstream of the Roxburgh Dam in central Otago, New Zealand, has created a delta of similar to50 x 10(6) m(3) since commissioning of the dam in 1956. Growth of the delta has decreased hydroelectric capacity and possibly aggravated flooding in the town of Alexandra at the upstream end of the lake. One mitigation strategy is to drop water levels in Lake Roxburgh during flood events and erode the delta, but it is difficult to know a priori how the system will behave under these conditions. Here, a coupled water/sediment routing model is proposed for heterogeneous size-density sediments (MIDAS) that predicts reasonably well temporal changes in bed elevations of up to 10 m and grain-size coarsening of almost an order of magnitude for a 33-year interval of delta growth and flushing. Model-data comparison also shows that the rate of downstream fining of the delta increases during aggradation, corroborating the suggestion of others that fining rates in ancient alluvial deposits reflect basin subsidence rates as well as distance to source terrain.



Original languageEnglish
Title of host publicationGeologic Modelling and Simulation - Sedimentary Systems
EditorsDF Merriam, JC Davies
ISBN (Print)0306466759
Publication statusPublished - 2001

    Research areas


Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. Late Quaternary tectonics controlled by fault reactivation. Insights from a local transpressional system in the intermontane Lerma valley, Cordillera Oriental, NW Argentina

    García, V. H., Hongn, F., Yagupsky, D., Pingel, H., Kinnaird, T., Winocur, D., Cristallini, E., Robinson, R. A. J. & Strecker, M. R., Nov 2019, In : Journal of Structural Geology. 128, 103875.

    Research output: Contribution to journalArticle

  2. Evolution of the Mozambique Belt in Malawi constrained by granitoid U-Pb, Sm-Nd and Lu-Hf isotopic data

    Manda, B. W. C., Cawood, P. A., Spencer, C. J., Prave, T., Robinson, R. & Roberts, N. M. W., 29 Nov 2018, In : Gondwana Research. In press

    Research output: Contribution to journalArticle

  3. Rapid and punctuated Late Holocene recession of Siling Co, central Tibet

    Shi, X., Kirby, E., Furlong, K. P., Meng, K., Robinson, R., Lu, H. & Wang, E., 15 Sep 2017, In : Quaternary Science Reviews. 172, p. 15-31 17 p.

    Research output: Contribution to journalArticle

  4. Landscape response to late Pleistocene climate change in NW Argentina: sediment flux modulated by basin geometry and connectivity

    Schildgen, T. F., Robinson, R. A. J., Savi, S., Phillips, W. M., Spencer, J. Q. G., Bookhagen, B., Scherler, D., Tofelde, S., Alonso, R. N., Kubik, P. W., Binnie, S. A. & Strecker, M. R., Feb 2016, In : Journal of Geophysical Research - Earth Surface. 121, 2, p. 392-414 23 p.

    Research output: Contribution to journalArticle

  5. Fluvio-deltaic avulsions during relative sea-level fall

    Nijhuis, A. G., Edmonds, D. A., Caldwell, R. L., Cederberg, J. A., Slingerland, R. L., Best, J. L., Parsons, D. R. & Robinson, R. A. J., Aug 2015, In : Geology. 43, 8, p. 719-722 4 p.

    Research output: Contribution to journalArticle

ID: 183975