Abstract
Large rivers often present a river–lake–delta system, with a wide range of temporal and spatial scales of the flow due to the combined effects of human activities and various natural factors, e.g., river discharge, tides, climatic variability, droughts, floods. Numerical models that allow for simulating the flow in these river–lake–delta systems are essential to study them and predict their evolution under the impact of various forcings. This is because they provide information that cannot be easily measured with sufficient temporal and spatial detail. In this study, we combine one-dimensional sectional-averaged (1D) and two-dimensional depth-averaged (2D) models, in the framework of the finite element model SLIM, to simulate the flow in the Mahakam river–lake–delta system (Indonesia). The 1D model representing the Mahakam River and four tributaries is coupled to the 2D unstructured mesh model implemented on the Mahakam Delta, the adjacent Makassar Strait, and three lakes in the central part of the river catchment. Using observations of water elevation at five stations, the bottom friction for river and tributaries, lakes, delta, and adjacent coastal zone is calibrated. Next, the model is validated using another period of observations of water elevation, flow velocity, and water discharge at various stations. Several criteria are implemented to assess the quality of the simulations, and a good agreement between simulations and observations is achieved in both calibration and validation stages. Different aspects of the flow, i.e., the division of water at two bifurcations in the delta, the effects of the lakes on the flow in the lower part of the system, the area of tidal propagation, are also quantified and discussed.
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Acknowledgments
This study was conducted under the auspices of the project “Taking up the challenges of multi-scale marine modelling” which is funded by the Communauté Française de Belgique under contract ARC 10/15-028 (Actions de Recherche Concertées) with the aim of developing and using SLIM. Computational resources have been provided by the high-performance computing facilities of the Université catholique de Louvain (CISM/UCL) and the Consortium des Equipements de Calcul Intensif en Fédération Wallonie Bruxelles (CECI) funded by the Fonds de la Recherche Scientifique de Belgique (F.R.S.-FNRS). Eric Deleersnijder and Sandra Soares-Frazão are honorary research associates with this institution.
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Pham Van, C., de Brye, B., Deleersnijder, E. et al. Simulations of the flow in the Mahakam river–lake–delta system, Indonesia. Environ Fluid Mech 16, 603–633 (2016). https://doi.org/10.1007/s10652-016-9445-4
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DOI: https://doi.org/10.1007/s10652-016-9445-4