Modelling fine-grained sediment transport in the Mahakam land–sea continuum, Indonesia

Van, Chien Pham; Gourgue, Olivier; Sassi, M.G.; Hoitink, A.J.F.; Deleersnijder, Éric; Frazao, Sandra Soares

doi:10.1016/j.jher.2015.04.005

Cited by 10 publications

(10 citation statements)

References 55 publications

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“…Resolution flexibility captures the multiscale nature of the nonlinear development of a tidal wave propagating from deep water into a tidal river. For example, the horizontal mesh resolution of the model by de Brye et al [], later used by Pham Van et al [, ], decreases from 10 km in the coastal ocean to 100 m in the upper reaches of the tidal river. Finite element and finite‐volume numerical methods are well established for hydrodynamic modeling purposes, yet it is only recently that such models have become a realistic option without having recourse to a high performance computing facility.…”

Section: Implications For Deltasmentioning

confidence: 99%

“…Using a finite‐volume model referred to as Delft3D Flexible Mesh [ Kernkamp et al , ] in a 2‐D mode, Achete et al [] took a first step toward the modeling of sediment dynamics and the associated ecological parameters in the San Francisco tidal wetlands. Flexible mesh numerical models have the promise to reproduce sediment transport in tidal rivers and the adjacent wetlands from source to sink [ Pham Van et al , ; Achete et al , ] and to allow coupling between processes governing flow, sediment transport, morphology, and ecology over a range of spatial and temporal scales.…”

Section: Implications For Deltasmentioning

confidence: 99%

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Tidal river dynamics: Implications for deltas

Hoitink

Jay

2016

Reviews of Geophysics

265

226

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Tidal rivers are a vital and little studied nexus between physical oceanography and hydrology.It is only in the last few decades that substantial research efforts have been focused on the interactions of river discharge with tidal waves and storm surges into regions beyond the limit of salinity intrusion, a realm that can extend inland hundreds of kilometers. One key phenomenon resulting from this interaction is the emergence of large fortnightly tides, which are forced long waves with amplitudes that may increase beyond the point where astronomical tides have become extinct. These can be larger than the linear tide itself at more landward locations, and they greatly influence tidal river water levels and wetland inundation. Exploration of the spectral redistribution and attenuation of tidal energy in rivers has led to new appreciation of a wide range of consequences for fluvial and coastal sedimentology, delta evolution, wetland conservation, and salinity intrusion under the influence of sea level rise and delta subsidence. Modern research aims at unifying traditional harmonic tidal analysis, nonparametric regression techniques, and the existing understanding of tidal hydrodynamics to better predict and model tidal river dynamics both in single-thread channels and in branching channel networks. In this context, this review summarizes results from field observations and modeling studies set in tidal river environments as diverse as the Amazon in Brazil, the Columbia, Fraser and Saint Lawrence in North America, the Yangtze and Pearl in China, and the Berau and Mahakam in Indonesia. A description of state-of-the-art methods for a comprehensive analysis of water levels, wave propagation, discharges, and inundation extent in tidal rivers is provided. Implications for lowland river deltas are also discussed in terms of sedimentary deposits, channel bifurcation, avulsion, and salinity intrusion, addressing contemporary research challenges.

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Section: Implications For Deltasmentioning

confidence: 99%

Section: Implications For Deltasmentioning

confidence: 99%

Tidal river dynamics: Implications for deltas

Hoitink

Jay

2016

Reviews of Geophysics

265

226

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“…with c k being an appropriate constant, and ∆ is the local characteristic length scale of the mesh. A value c k = 0.018 m 0.85 /s, which was calibrated from the best fit to the available salinity at 60 field sampling sites (see Figure 3) [42], is used to evaluate the diffusivity coefficient. The boundary and the initial conditions under which Equations (1) and (2) are to be solved are listed in…”

Section: Age Of Watermentioning

confidence: 99%

“…The latter is parameterized under the form of Equation 3, in which the local characteristic length scale of the grid is taken to be the distance between two channel cross-sections (i.e., 100 m). Equation 13is also solved the same way as governing equations in the 2D sub-domain (see details in [36,42]). A water parcel at open sea boundaries, which are located at the entrance and at the outlet of the Makassar Strait, is assumed to never return into the delta, and thus a value θ e = 0 is imposed.…”

Section: Exposure Timementioning

confidence: 99%

“…A maximum value of 9 days is obtained in the main southern and northern fluvial channels (i.e., transect 1 and transect 2), while the maximum age is about 11 days in transect 3. A nonlinear increase of the age of water from the upstream to the downstream boundaries can be explained by the decrease of the flow velocity along the transects, which is due to changes in bathymetry, channel cross-section, tidal effects, and meandering and curvature of channels [36,42]. On the other hand, to investigate the effect of the tides on the water age, the standard deviation of the water age is also calculated at each location along the three considered transects, resulting in values lying between 0.5 and 4 days.…”

Section: Finite Element Implementationmentioning

confidence: 99%

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Numerical Simulation of Water Renewal Timescales in the Mahakam Delta, Indonesia

Van

Brye

Brauwere

et al. 2020

Water

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Water renewal timescales, namely age, residence time, and exposure time, which are defined in accordance with the Constituent-oriented Age and Residence time Theory (CART), are computed by means of the unstructured-mesh, finite element model Second-generation Louvain-la-Neuve Ice-ocean Model (SLIM) in the Mahakam Delta (Borneo Island, Indonesia). Two renewing water types, i.e., water from the upstream boundary of the delta and water from both the upstream and the downstream boundaries, are considered, and their age is calculated as the time elapsed since entering the delta. The residence time of the water originally in the domain (i.e., the time needed to hit an open boundary for the first time) and the exposure time (i.e., the total time spent in the domain of interest) are then computed. Simulations are performed for both low and high flow conditions, revealing that (i) age, residence time, and exposure time are clearly related to the river volumetric flow rate, and (ii) those timescales are of the order of one spring-neap tidal cycle. In the main deltaic channels, the variation of the diagnostic timescales caused by the tide is about 35% of their averaged value. The age of renewing water from the upstream boundary of the delta monotonically increases from the river mouth to the delta front, while the age of renewing water from both the upstream and the downstream boundaries monotonically increases from the river mouth and the delta front to the middle delta. Variations of the residence and the exposure times coincide with the changes of the flow velocity, and these timescales are more sensitive to the change of flow dynamics than the age. The return coefficient, which measures the propensity of water to re-enter the domain of interest after leaving it for the first time, is of about 0.3 in the middle region of the delta.

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Investigation of the fecal coliform plumes induced by river discharge and wind stress using a three-dimensional model

Liu

2019

Environ Fluid Mech

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Modelling fine-grained sediment transport in the Mahakam land–sea continuum, Indonesia

Abstract: Mahakam land-sea continuum, fine-grained sediment, finite element model, coupled

Cited by 10 publications

References 55 publications

Tidal river dynamics: Implications for deltas

Tidal river dynamics: Implications for deltas

Numerical Simulation of Water Renewal Timescales in the Mahakam Delta, Indonesia

Investigation of the fecal coliform plumes induced by river discharge and wind stress using a three-dimensional model

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