A sediment fluxes investigation for the 2-D modelling of large river morphodynamics

Guerrero, Massimo; Latosinski, F.; Nones, Michael; Szupiany, R. N.; Re, Mariano; Gaeta, Maria Gabriella

doi:10.1016/j.advwatres.2015.01.017

Cited by 26 publications

(17 citation statements)

References 32 publications

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“…The integration of erosion-deposition patterns resulted in average net erosion and deposition volumes per unit width in the order of few meters for the main and secondary channels, respectively. These morphological changes correspond to observed tendencies from surveyed bathymetries and shore-margin lines as reported for that area by Guerrero et al [13]. Although the differences observed between measured and simulated flow velocity distributions in secondary channels (i.e., maximal values in XS2 and XS5), overall, model results are in good agreement with observations regarding flow field, sediment transport, and occurred morphological changes, that indicates the developed Delft3D model of the Parana river-reach can be used for further exploration of dredging strategies.…”

Section: Hydro-morphodynamic Validation Of Model Resultsmentioning

confidence: 99%

“…In the investigated case of the Parana River, we chose realistic topographical data to represent the flow boundaries and also adopted plausible modelling choices from an existing Parana morphodynamic model [13]. However, it should be emphasized that model improvements could be made to improve its representations of reality, and also to achieve more accurate estimates of actual dredging loads under various conditions and dredge-and-dump strategies.…”

Section: Discussionmentioning

confidence: 99%

“…m/s), that corresponds to the observed maximum celerity of the developing bars from repeated bathymetric surveys during the wet month [13]. This resulted in a maximum acceptable MF value of 86,400; in this study we applied a morphological acceleration factor of 1440 which is well below the maximum allowable MF.…”

Section: Hydrodynamic and Morphodynamic Model Settingsmentioning

confidence: 99%

“…The flow is simulated in a horizontal plane (2-DH) and sediment transport is computed by the Engelund and Hansen [22] formula. Following the modeling approach as presented in Guerrero et al [13], we used the single fraction total-load formula by Engelund and Hansen, with 0.26 mm grain size to represent sediment from the river bed and a calibration factor of 0.2. This factor matches the average observed sand concentration loads of 6 mg/L at a discharge of about 14,300 m 3 /s [23].We used a constant bed roughness value throughout the modeling domain of Manning equal to 0.03, corresponding to a Gaukler-Strickler value of 33.…”

Section: Hydrodynamic and Morphodynamic Model Settingsmentioning

confidence: 99%

“…In this paper, we set up and applied a morphodynamic computational model in a quasi-steady un-coupled approach that allowed exploration of efficiency of different dredging strategies in the medium-long term (i.e., years). Guerrero et al [13] have set-up a hydro-morphodynamic of the Parana, which we used as a basis in this study. However, we included several important novelties; first, we considered the influence of using a detailed discharge-hydrograph, as opposed to using yearly-averaged river discharges only.…”

Section: Introductionmentioning

confidence: 99%

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Optimizing Dredge-and-Dump Activities for River Navigability Using a Hydro-Morphodynamic Model

Paarlberg

Guerrero

Huthoff

et al. 2015

Water

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Worldwide, significant dredging activities of riverbed sediment are employed to ensure that freight transportation on rivers can continue year-round. Imbalances of sediment budget may produce relevant impacts regarding river morphology and related environmental services. This study shows that hydro-morphodynamic modeling tools can be used to optimize dredge-and-dump activities and, at the same time, mitigate problems deriving from these activities in rivers. As a case study, we focused on dredging activities on the Lower Parana River, Argentina. Navigation on this river is of crucial importance to the economies of the bordering countries, hence, each year significant dredging activities are employed. To estimate dredging loads under different strategies, a 25 km river reach of the Parana River was modeled using the Delft3D-modelling suite by Deltares. The Netherlands, to simulate flow-sediment interactions in a quasi-steady and uncoupled approach. Impacts of dredging activities were explicitly included. Different dredge-and-dump strategies included variations in dredging over-depth (clearance) and variations in dumping locations. Our results indicate that dredge-and-dump strategies can be targeted to stimulate natural processes that improve the depth and stability of the navigation channel and to counteract unwanted bed level responses in the long-medium term. A ~40% reduction in dredging effort could be achieved by moving the dredged material to distant locations in the secondary channel rather than dumping to the side of the waterway in the main channel. OPEN ACCESSWater 2015, 7 3944

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Section: Hydro-morphodynamic Validation Of Model Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Hydrodynamic and Morphodynamic Model Settingsmentioning

confidence: 99%

Section: Hydrodynamic and Morphodynamic Model Settingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimizing Dredge-and-Dump Activities for River Navigability Using a Hydro-Morphodynamic Model

Paarlberg

Guerrero

Huthoff

et al. 2015

Water

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Morphological response of gravel bed rivers near a knickpoint: Effect of bars on dynamic equilibrium river profile

Tanabe,

Iwasaki,

Shimizu

2024

Earth Surf Processes Landf

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Geomorphological evolution is one of the main factors that increases flood damage in small or medium rivers located in upstream river reaches. These types of flood damage have been increasing at knickpoints where the riverbed slope and river width change abruptly and are likely to cause non‐equilibrium conditions for sediment transport during floods. Therefore, it is important to understand the non‐equilibrium morphological response at the knickpoint and the resulting new dynamic equilibrium state under given external forces. The effects of two‐dimensional (2D) morphological features on the dynamic equilibrium riverbed profile, however, have not been specifically studied because the methods currently in use for calculating equilibrium profiles are based on zero‐ or one‐dimensional (0D or 1D) modeling. Here, we perform numerical calculations using the 2D morphodynamic model iRIC‐Nays2DH to clarify the dynamic equilibrium profile and the process of reaching a dynamic equilibrium state. We also use an existing 1D model to show the 2D effect in the dynamic equilibrium state. To understand this, we set up three channels: slope transition point, width transition point, and both the slope and width transition point. 1D results show a constant slope profile in channels with constant width and upward‐convex profiles in channels with width expansion at the equilibrium state, owing to the adjustment of the difference in sediment transport volume in the two reaches with different widths by changing the slopes. In contrast, the 2D results show that the alternate bars create a small autogenic knickpoint even in the straight channel and significantly dampen sediment deposition at the width expansion point, as seen in the 1D model result. This was because the bars' shape increased the volume of sediment transport because the shape of the bars concentrated flow. These results suggest that 2D morphological features, such as fluvial bars, play a significant role in the equilibrium riverbed profile.

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Po River Morphodynamics Modelled with the Open-source Code iRIC

Nones

Pugliese

Domeneghetti

et al. 2018

GeoPlanet: Earth and Planetary Sciences

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The paper presents the numerical modelling of the hydro-morphological evolution of a 10-km reach of the Po River in Italy. The simulation is performed with the freeware code iRIC, recently developed by an international community of scientists and practitioners. Starting from a non-detailed description of the studied area and using synthetic data, the reach has been modelled adopting a 2-D solver. Based on a Digital Elevation Model of the area, the domain is discretized by an unstructured grid with triangular meshes. First results show a promising capability of the model in reproducing the behaviour of the reach, both in terms of liquid flow and morphodynamics, if compared with historical data measured along the watercourse and reported in literature. In the future, additional simulations will be performed, enlarging the studied area and using detailed input data measured with traditional and innovative techniques.

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A sediment fluxes investigation for the 2-D modelling of large river morphodynamics

Cited by 26 publications

References 32 publications

Optimizing Dredge-and-Dump Activities for River Navigability Using a Hydro-Morphodynamic Model

Optimizing Dredge-and-Dump Activities for River Navigability Using a Hydro-Morphodynamic Model

Morphological response of gravel bed rivers near a knickpoint: Effect of bars on dynamic equilibrium river profile

Po River Morphodynamics Modelled with the Open-source Code iRIC

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