Numerical analysis of coupled hydrosystems based on an object-oriented compartment approach

Kolditz, Olaf; Delfs, Jens-Olaf; Bürger, Claudius; Beinhorn, Martin; Park, Chan Hee

doi:10.2166/hydro.2008.003

Cited by 40 publications

(19 citation statements)

References 34 publications

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“…The RWPT model in the open source scientific software GeoSys/RockFlow (GS/RF) (Kolditz and Bauer, 2004;Kolditz et al, 2008;Wang and Kolditz, 2007) has been tested with several benchmark test problems. These benchmarks are designed to evaluate the accuracy in flow and transport in various types of media such as fractured and porous media under various flow conditions .…”

Section: Methodsmentioning

confidence: 99%

A study of preferential flow in heterogeneous media using random walk particle tracking

et al. 2008

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We investigated the onset of preferential flow in heterogeneous porous media using the random walk particle tracking (RWPT) concept. The RWPT model is first used to analyze empirically the required number of particles to achieve accurate concentration distributions in two-dimensional homogeneous media and under uniform flow conditions. The analysis is then extended to randomly heterogeneous systems. By increasing the variance of log-normal hydraulic conductivity fields, the transition between homogeneous and preferential flows is observed. To analyze the degree of preferential flow in the porous media, we provide a diagram that consists of two dimensionless parameters: normalized travel time and distance. All the heterogeneous media synthetically generated show a linear relation in the diagram. The characteristic travel velocity increases with increasing heterogeneity. We found the diagram is a useful tool to analyze preferential flow.

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Section: Methodsmentioning

confidence: 99%

A study of preferential flow in heterogeneous media using random walk particle tracking

et al. 2008

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“…Since the late 1990s, new models based on finite element numerical schemes have been developed (Bixio et al, 2002;Goderniaux et al, 2009;Kolditz et al, 2008;Kollet and Maxwell, 2006;Li et al, 2008;Panday and Huyakorn, 2004;Therrien et al, 2010;VanderKwaak and Loague, 2001;Weill et al, 2009). These models allow the simulation of the pressure head in 3-D instead of the former pseudo 3-D modelling of the piezometric head.…”

Section: Overview Of Coupled Surface-subsurface Hydrological Modelsmentioning

confidence: 99%

Continental hydrosystem modelling: the concept of nested stream–aquifer interfaces

Flipo

Mouhri

Labarthe

et al. 2014

Hydrol. Earth Syst. Sci.

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Abstract. Coupled hydrological-hydrogeological models, emphasising the importance of the stream-aquifer interface, are more and more used in hydrological sciences for pluridisciplinary studies aiming at investigating environmental issues. Based on an extensive literature review, stream-aquifer interfaces are described at five different scales: local [10 cm- . This led us to develop the concept of nested stream-aquifer interfaces, which extends the well-known vision of nested groundwater pathways towards the surface, where the mixing of low frequency processes and high frequency processes coupled with the complexity of geomorphological features and heterogeneities creates hydrological spiralling. This conceptual framework allows the identification of a hierarchical order of the multi-scale control factors of stream-aquifer hydrological exchanges, from the larger scale to the finer scale. The hyporheic corridor, which couples the river to its 3-D hyporheic zone, is then identified as the key component for scaling hydrological processes occurring at the interface. The identification of the hyporheic corridor as the support of the hydrological processes scaling is an important step for the development of regional studies, which is one of the main concerns for water practitioners and resources managers.In a second part, the modelling of the stream-aquifer interface at various scales is investigated with the help of the conductance model. Although the usage of the temperature as a tracer of the flow is a robust method for the assessment of stream-aquifer exchanges at the local scale, there is a crucial need to develop innovative methodologies for assessing stream-aquifer exchanges at the regional scale. After formulating the conductance model at the regional and intermediate scales, we address this challenging issue with the development of an iterative modelling methodology, which ensures the consistency of stream-aquifer exchanges between the intermediate and regional scales.Finally, practical recommendations are provided for the study of the interface using the innovative methodology MIM (Measurements-Interpolation-Modelling), which is graphically developed, scaling in space the three pools of methods needed to fully understand stream-aquifer interfaces at various scales. In the MIM space, stream-aquifer interfaces that can be studied by a given approach are localised. The efficiency of the method is demonstrated with two examples. The first one proposes an upscaling framework, structured around river reaches of ∼ 10-100 m, from the local to the watershed scale. The second example highlights the usefulness of space borne data to improve the assessment of streamaquifer exchanges at the regional and continental scales. We conclude that further developments in modelling and field measurements have to be undertaken at the regional scale to enable a proper modelling of stream-aquifer exchanges from the local to the continental scale.

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“…The Richards' equation describing the water movement in the soil system is known as (Kolditz et al, 2008).…”

Section: Bulk Water Flow In the Unsaturated Zonementioning

confidence: 99%

Implementing small scale processes at the soil-plant interface – the role of root architectures for calculating root water uptake profiles

Schneider

Attinger

Delfs

et al. 2010

Hydrol. Earth Syst. Sci.

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Abstract. In this paper, we present a stand alone root water uptake model called aRoot, which calculates the sink term for any bulk soil water flow model taking into account water flow within and around a root network. The boundary conditions for the model are the atmospheric water demand and the bulk soil water content. The variable determining the plant regulation for water uptake is the soil water potential at the soil-root interface. In the current version, we present an implementation of aRoot coupled to a 3-D Richards model. The coupled model is applied to investigate the role of root architecture on the spatial distribution of root water uptake. For this, we modeled root water uptake for an ensemble (50 realizations) of root systems generated for the same species (one month old Sorghum). The investigation was divided into two Scenarios for aRoot, one with comparatively high (A) and one with low (B) root radial resistance. We compared the results of both aRoot Scenarios with root water uptake calculated using the traditional Feddes model. The vertical rooting density profiles of the generated root systems were similar. In contrast the vertical water uptake profiles differed considerably between individuals, and more so for Scenario B than A. Also, limitation of water uptake occurred at different bulk soil moisture for different modeled individuals, in particular for Scenario A. Moreover, the aRoot model simulations show a redistribution of water uptake from more densely to less densely rooted layers with time. This behavior is in agreement with observation, but was not reproduced by the Feddes model.

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Numerical analysis of coupled hydrosystems based on an object-oriented compartment approach

Cited by 40 publications

References 34 publications

A study of preferential flow in heterogeneous media using random walk particle tracking

A study of preferential flow in heterogeneous media using random walk particle tracking

Continental hydrosystem modelling: the concept of nested stream–aquifer interfaces

Implementing small scale processes at the soil-plant interface – the role of root architectures for calculating root water uptake profiles

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