Potential of a Gravity‐Driven Film Flow Model to Predict Infiltration in a Catchment for Diverse Soil and Land Cover Combinations

Demand, Dominic; Weiler, Markus

doi:10.1029/2019wr026988

Cited by 7 publications

(6 citation statements)

References 84 publications

(148 reference statements)

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“…As usual, such approaches can be of a different complex nature. For example, the Stokes‐flow approach by Germann (2018) and its derivative “gravity‐driven film” approach by Demand and Weiler (2021) aim to describe in detail the gravity‐ but non‐capillary‐driven entrance of water into larger soil voids and tubes. Others have suggested a combination of at least two types of porous media of different hydraulic features, for example, Faeh et al (1997), Gerke (2006) and Kodešová et al (2006).…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, the focus of this article is to elucidate the main features and governing conditions of surface runoff generation due to IE, and to present approaches and options to include these aspects into hydrological models. It becomes clear that the mechanisms of occurrence and the magnitude are controlled by the interplay between the soil surface conditions (soil infiltrability) and the available water per time step, that is, rainfall intensity (as described by e.g., Scherrer et al, 2007;Alaoui et al, 2011;Weiler, 2017;Demand & Weiler, 2021).In general terms, both available water at the surface and the local infiltration capacity control the origin of IE. That is to say, surface runoff by infiltration excess Q s (t) is generated if the water per time step available at the soil surface (e.g., disposed by high intensity rainfall, or from local inundations from a previous time step) P(t) exceeds the actual maximum infiltration capacity INF max (t) as illustrated in the right panel of Figure 2.…”

Section: Mechanisms Of Infiltration Excessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modelling infiltration and infiltration excess: The importance of fast and local processes

Bronstert

Niehoff²,

Schiffler³

2023

Hydrological Processes

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Physically based distributed hydrological models aim at an adequate representation of hydrological processes, including runoff generation. A significant proportion of runoff is generated through the subsurface, that is, by groundwater flow or unsaturated subsurface stormflow. However, in the case of high rainfall intensity and/or low soil-surface infiltrability, surface runoff may strongly contribute to total runoff, too, either through saturation excess ("Dunne-type surface runoff") or infiltration excess ("Hortonian surface runoff"). Both types of surface runoff can be rather important if antecedent wetness is high and parts of the catchment area are saturated (leading to saturation excess), or if the maximum infiltration rate into the soil surface is less than the actual rainfall intensity (resulting in infiltration excess). Even though the latter process can be very important during high-intensity rainstorms, both for flood generation and for matter transport linked with surface runoff, an appropriate consideration of this process in catchment models is still challenging.Actually, budgeting between the actual rainfall intensity and the soil surface infiltration capacity is required and there are a number of challenges in the details: First, the "real" rainfall intensity may vary tremendously in time increments much smaller than the time step of the model. The soil surface infiltrability can also be significantly reduced, for example, by crusting, compaction or sealing of the soil surface or through hydrophobic effects. Otherwise, soil infiltrability can be strongly enhanced as a consequence of preferential flow paths/macropores caused by, for example, bioturbations or other voids. Finally, there is a high variability of such soil surface features at a small spatial scale, below the typical spatial modelling unit. We present observational data and approaches to deal with these challenges. We show results from combined infiltration/infiltration-excess experiments and observations at three spatial scales. Then, we present a model approach based on a double-porosity soil enabling the combined modelling of high infiltration rates and dampened soil moisture distribution after termination of infiltration, as observable in the field. Furthermore, we present an approach to model the effects of soil surface conditions on actual infiltration capacity. These approaches improved the plausibility and explanatory power of the model concerning surface runoff generation and soil moisture

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Section: Discussionmentioning

confidence: 99%

Section: Mechanisms Of Infiltration Excessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modelling infiltration and infiltration excess: The importance of fast and local processes

Bronstert

Niehoff²,

Schiffler³

2023

Hydrological Processes

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“…Such a comparison should investigate how and when gravitational forces exceed capillary forces. For example, the interplay between rainfall characteristics (e.g., rainfall intensity) or soil properties (e.g., macropore network) may play a decisive role (Demand & Weiler, 2021).…”

Section: Hypothesis-driven Modeling Of 18 O Transport and Bromide Tra...mentioning

confidence: 99%

Consistent Modeling of Transport Processes and Travel Times—Coupling Soil Hydrologic Processes With StorAge Selection Functions

Schwemmle,

Weiler

2024

Water Resources Research

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Understanding the transport processes and travel times of pollutants in the subsurface is crucial for an effective management of drinking water resources. Transport processes and soil hydrologic processes are inherently linked to each other. In order to account for this link, we couple the process‐based hydrologic model RoGeR with StorAge Selection (SAS) functions. We assign to each hydrological process a specific SAS function (e.g., power law distribution function). To represent different transport mechanisms, we combined a specific set of SAS functions into four transport model structures: complete‐mixing, piston flow, advection‐dispersion and advection‐dispersion with time‐variant parameters. In this study, we conduct modeling experiments at the Rietholzbach lysimeter, Switzerland. All modeling experiments are benchmarked with HYDRUS‐1D. We compare our simulations to the measured hydrologic variables (percolation and evapotranspiration fluxes and soil water storage dynamics) and the measured water stable isotope signal (18O) in the lysimeter seepage for a period of ten years (1997–2007). An additional virtual bromide tracer experiment was used to benchmark the models. Additionally, we carried out a sensitivity analysis and provided Sobol indices for hydrologic model parameters and SAS parameters. Our results indicate that the advection‐dispersion transport model produces the best results. And thus, advective‐dispersive transport processes play a dominant role at Rietholzbach lysimeter. Our modeling approach provides the capability to test hypotheses of different transport mechanisms and to improve process understanding and predictions of transport processes. Overall, the combined model allows a very effective simulation of combined flux and transport processes at various temporal and spatial scales.

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“…the Hagen-Poiseuille equation) may provide some insights into the factors controlling preferential flow (e.g. Demand and Weiler, 2021). For example, for the same input rate and all other things being equal, this theory suggests that laminar water flow in thin films along macropore walls should be four times faster than flow in saturated fissures of the same width.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional X-Ray Imaging of Macropore Flow

Schwenk¹,

Jarvis²,

Larsbo³

et al. 2023

Preprint

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Potential of a Gravity‐Driven Film Flow Model to Predict Infiltration in a Catchment for Diverse Soil and Land Cover Combinations

Cited by 7 publications

References 84 publications

Modelling infiltration and infiltration excess: The importance of fast and local processes

Modelling infiltration and infiltration excess: The importance of fast and local processes

Consistent Modeling of Transport Processes and Travel Times—Coupling Soil Hydrologic Processes With StorAge Selection Functions

Three-Dimensional X-Ray Imaging of Macropore Flow

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