Tidal impact on the division of river discharge over distributary channels in the Mahakam Delta

Sassi, Maximiliano; Hoitink, A.; Brye, Benjamin; Vermeulen, Bart; Deleersnijder, Eric
December 2011
Ocean Dynamics;Dec2011, Vol. 61 Issue 12, p2211
Academic Journal
Bifurcations in tidally influenced deltas distribute river discharge over downstream channels, asserting a strong control over terrestrial runoff to the coastal ocean. Whereas the mechanics of river bifurcations is well-understood, junctions in tidal channels have received comparatively little attention in the literature. This paper aims to quantify the tidal impact on subtidal discharge distribution at the bifurcations in the Mahakam Delta, East Kalimantan, Indonesia. The Mahakam Delta is a regular fan-shaped delta, composed of a quasi-symmetric network of rectilinear distributaries and sinuous tidal channels. A depth-averaged version of the unstructured-mesh, finite-element model second-generation Louvain-la-Neuve Ice-ocean Model has been used to simulate the hydrodynamics driven by river discharge and tides in the delta channel network. The model was forced with tides at open sea boundaries and with measured and modeled river discharge at upstream locations. Calibration was performed with water level time series and flow measurements, both spanning a simulation period. Validation was performed by comparing the model results with discharge measurements at the two principal bifurcations in the delta. Results indicate that within 10 to 15 km from the delta apex, the tides alter the river discharge division by about 10% in all bifurcations. The tidal impact increases seaward, with a maximum value of the order of 30%. In general, the effect of tides is to hamper the discharge division that would occur in the case without tides.


Related Articles

  • Seasonal changes of a dynamic macrotidal beach: Case Study of Marieta Beach (Amazon Coast/Brazil). Guerreiro, Juliana S.; Ranieri, Leilanhe A.; El-Robrini, Maâmar; Vila-Concejo, Ana // Journal of Coastal Research;2013 Special Issue 65, p1780 

    Guerreiro, J.S., Ranieri, L. A., El-Robrini, M., Vila-Concejo. Seasonal changes of a dynamic macrotidal beach: Case Study of Marieta beach(Amazon Coast/Brazil) The Amazon Atlantic Coast is a very dynamic area due to the large discharge associated to a large network of rivers that include the...

  • Indonesia.  // Pipeline & Utilities Construction;Jun95, Vol. 50 Issue 6, p10 

    Reports that exploration wells drilled by Unocal Indonesia Co. in the Mahakam Delta area contains significant amount of natural gas and condensate.

  • Observations of waves' impact on currents in a mixed-energy tidal inlet: Arcachon on the southern French Atlantic coast. Senechal, Nadia; Sottolichio, Aldo; Bertrand, Frédéric; Goeldner-Gianella, Lydie; Garlan, Thierry // Journal of Coastal Research;2013 Special Issue 65, p2053 

    Sénéchal, N., Sottolichio A., Bertrand, F., Goeldner-Giannella, L., Garlan, T., 2013. Analysis of currents and storm surge in a mixed-energy tidal inlet during storm conditions. Coastal morphodynamic processes around tidal inlets in mixed-energy environments are particularly complex due to...

  • Experimental and numerical study of the hydrodynamics of the western sector of Ria Formosa. Jacob, Jos; Cardeira, Sara; Rodrigues, Marta; Bruneau, Nicolas; Azevedo, Alberto; Fortunato, André B.; Rosa, Mónica; Cravo, Alexandra // Journal of Coastal Research;2013 Special Issue 65, p2011 

    Jacob, J., Cardeira, S., Rodrigues, M., Bruneau, N., Azevedo, A., Fortunato, A.B., Rosa, M. and Cravo, A., 2013. Experimental and numerical study of the hydrodynamics of the western sector of Ria Formosa. The western sector of Ria Formosa, a lagoon system in the south of Portugal, represents...

  • Harnessing tidal power in shallow waters. Knight, Helen // Engineer (00137758);3/29/2002, Vol. 291 Issue 7595, p9 

    Reports on a device being developed in Great Britain that could allow tidal current turbines to be used in shallow waters. Advantage of tidal currents; Difficulty with tidal power; Benefits of the device.

  • Challenges of a transition to a sustainably managed shrimp culture agro-ecosystem in the Mahakam delta, East Kalimantan, Indonesia. Bosma, Roel; Sidik, Ahmad; Zwieten, Paul; Aditya, Anugrah; Visser, Leontine // Wetlands Ecology & Management;Apr2012, Vol. 20 Issue 2, p89 

    Around 1990, when in other countries mangrove protection took off, massive conversion of mangrove forest into shrimp ponds started in the Mahakam delta. To identify constraints to and options for sustainable management we analysed institutions and constraints with stakeholders. In 3 sites we...

  • Preliminary results of a finite-element, multi-scale model of the Mahakam Delta (Indonesia). Brye, Benjamin; Schellen, Sébastien; Sassi, Maximiliano; Vermeulen, Bart; Kärnä, Tuomas; Deleersnijder, Eric; Hoitink, Ton // Ocean Dynamics;Aug2011, Vol. 61 Issue 8, p1107 

    The Mahakam is a 980-km-long tropical river flowing in the East Kalimantan province (Borneo Island, Indonesia). A significant fraction of this river is influenced by tides, the modelling of which is the main subject of this study. Various physical and numerical issues must be addressed. In the...

  • Could the tide be turning? Russell, Eric // International Power Generation;May2004, Vol. 27 Issue 3, p24 

    Looks at the industrial projects that could bring the benefits of tidal power to the forefront of sustainable energy in Great Britain in 2004. Necessity for further research to improve the amount of electricity that can be generated from a tidal flow; Information on the Engineering Business'...

  • Wave and tidal. Kermode, Neil // TCE: The Chemical Engineer;Sep2008, Issue 807, p36 

    The article discusses the potential of harnessing tidal energy from the sea. The entry notes that one-fifth of Great Britain's electricity needs may soon come from marine sources as The Carbon Trust established by the British government is accelerating efforts to identify low carbon energy. It...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics