A Sedimentological Model to Characterize Braided River Deposits for Hydrogeological Applications

2009 ◽  
pp. 51-74 ◽  
Author(s):  
Peter Huggenberger ◽  
Christian Regli
Keyword(s):  
Braided River ◽  
River Deposits

scholarly journals Subsurface flow mixing in coarse, braided river deposits

2016 ◽  
Vol 20 (5) ◽  
pp. 2035-2046 ◽  
Author(s):  
Emanuel Huber ◽  
Peter Huggenberger
Keyword(s):  
Large Scale ◽  
Hyporheic Zone ◽  
Flow Direction ◽  
Subsurface Flow ◽  
Small Scale ◽  
Braided River ◽  
Flow Deviation ◽  
River Deposits ◽  
Advective Mixing ◽  
The Impact

Abstract. Coarse, braided river deposits show a large hydraulic heterogeneity on the metre scale. One of the main depositional elements found in such deposits is a trough structure filled with layers of bimodal gravel and open-framework gravel, the latter being highly permeable. However, the impact of such trough fills on subsurface flow and advective mixing has not drawn much attention. A geologically realistic model of trough fills is proposed and fitted to a limited number of ground-penetrating radar records surveyed on the river bed of the Tagliamento River (northeast Italy). A steady-state, saturated subsurface flow simulation is performed on the small-scale, high-resolution, synthetic model (size: 75 m  ×  80 m  ×  9 m). Advective mixing (i.e. streamline intertwining) is visualised and quantified based on particle tracking. The results indicate strong advective mixing as well as a large flow deviation induced by the asymmetry of the trough fills with regard to the main flow direction. The flow deviation induces a partial, large-scale rotational effect. These findings depict possible advective mixing found in natural environments and can guide the interpretation of ecological processes such as in the hyporheic zone.

Paleoenvironments, paleoclimates and sequences of Westphalian deposits of Lorraine coal basin (Upper Carboniferous, NE France)

2005 ◽  
Vol 176 (3) ◽  
pp. 301-315 ◽  
Author(s):  
Alain Izart ◽  
Christian Palain ◽  
Fabrice Malartre ◽  
Stéphanie Fleck ◽  
Raymond Michels
Keyword(s):  
Flood Plain ◽  
Alluvial Fan ◽  
Well Logs ◽  
Water Flooding ◽  
Cylindrical Shape ◽  
Braided River ◽  
Coal Basin ◽  
Meandering River ◽  
Period 2 ◽  
River Deposits

Abstract Facies and sequences of the Westphalian C are identified in cores and well logs of three boreholes and three seismic lines supplied by Conoco-Phillips from the Lorraine coal Basin. The lithofacies associations suggest various paleoenvironments and sequences during the Westphalian C. Decameter-thick sedimentary bodies display alluvial fan deposits in the northwestern border of the basin (Chaumont borehole). Decametric sedimentary bodies constituted either of conglomeratic and sandy facies with cylindrical shape in well logs represent braided river deposits, or alternations of fining and coarsening upward sequences with sandy, silty and clayey facies with bell and funnel shapes in well log correspond to meander river and lacustrine deltaic deposits in the Saulcy and Lorettes boreholes. Three fining upward third order sequences in the center of the basin in the Lorettes and Saulcy boreholes represent a period 1 with braided river deposits, a period 2 with flood plain, lake and meandering river deposits and a period 3 with anastomosed or meandering river deposits. Period 1 is correlated with a subsidence period in the basin and uplift of the borders, period 2 with the maximum fresh water flooding period with flood plain or lake deposits and period 3 with the filling period. The seismic profiles of Conoco-Phillips confirm the tectonic structures described by previous authors in Lorraine Basin. We agree that this basin was a strike-slip basin as demonstrated by previous authors with depocenters near the South Hunsrück and Metz faults from the Westphalian to the Permian. Biomarkers show that paleoclimate changes (wet/dry) of weak amplitude in the equatorial climate could also modify the sedimentation of this basin and act on sequences of second order.

scholarly journals Morpho-sedimentary characteristics of proximal gravel braided river deposits in a Froude-scaled physical model

Sedimentology ◽  
2017 ◽  
Vol 65 (3) ◽  
pp. 877-896 ◽  
Author(s):  
Tobi Gardner ◽  
Peter Ashmore ◽  
Pauline Leduc
Keyword(s):  
Physical Model ◽  
Braided River ◽  
Sedimentary Characteristics ◽  
River Deposits

scholarly journals Subsurface flow mixing in coarse, braided river deposits

2015 ◽  
Vol 12 (9) ◽  
pp. 9295-9316 ◽  
Author(s):  
E. Huber ◽  
P. Huggenberger
Keyword(s):  
Flow Field ◽  
Subsurface Flow ◽  
Three Dimensional ◽  
Small Scale ◽  
Braided River ◽  
Advective Transport ◽  
Open Framework ◽  
Flow Mixing ◽  
River Deposits ◽  
The Impact

Abstract. Coarse, braided river deposits show a large hydraulic heterogeneity at the metre scale. One of the main depositional elements found in such deposits is a trough structure filled with open-framework–bimodal gravel couplet cross-beds. Several studies investigated the impact of the highly permeable open-framework gravel texture mainly in terms of concentration breakthrough curves. However, although the trough fills are expected to be significant mixing agents for the subsurface flow, their impact on the three-dimensional flow field has not draw much attention. This study aims to evaluate the subsurface flow mixing caused by overlapping trough fills embedded in a poorly-sorted gravel matrix. Below the river bed of the Tagliamento River (northeast Italy), trough fills were identified with ground-penetrating radar (GPR) probing. Based on field observations of coarse, braided river deposits, a simple three-dimensional geometrical model with associated hydraulic properties was fitted to the interpreted GPR reflectors. Then, steady-state subsurface flow and advective transport simulations were performed on the small-scale, high-resolution model (size: 45 m × 50 m × 10.26 m). The impact of trough fills on the flow field is visualised by the injection of a conservative tracer at three different depths.

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