Comparing overland flow processes between semiarid and humid regions: Does saturation overland flow take place in semiarid regions?

Kidron, Giora J.

doi:10.1016/j.jhydrol.2020.125624

Cited by 19 publications

(9 citation statements)

References 78 publications

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“…The process of groundwater capture is expected to be important wherever streamflow is dominated by either groundwater discharge or saturation overland flow. In systems where infiltration-excess flow is dominant, which include most semi-arid and arid regions (Kidron, 2021), groundwater capture could still occur and would determine which streams discharge groundwater and are active perennially, but streams that are detached from the groundwater table would still be able to incise. In addition, groundwater capture may be less important for systems dominated by subsurface storm flow in perched aquifers that are detached from the water table.…”

Section: Groundwater Capturementioning

confidence: 99%

Transmissivity and groundwater flow exert a strong influence on drainage density

Luijendijk¹

2022

Earth Surf. Dynam.

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Abstract. The extent to which groundwater flow affects drainage density and erosion has long been debated but is still uncertain. Here, I present a new hybrid analytical and numerical model that simulates groundwater flow, overland flow, hillslope erosion and stream incision. The model is used to explore the relation between groundwater flow and the incision and persistence of streams for a set of parameters that represent average humid climate conditions. The results show that transmissivity and groundwater flow exert a strong control on drainage density. High transmissivity results in low drainage density and high incision rates (and vice versa), with drainage density varying roughly linearly with transmissivity. The model evolves by a process that is defined here as groundwater capture, whereby streams with a higher rate of incision draw the water table below neighbouring streams, which subsequently run dry and stop incising. This process is less efficient in models with low transmissivity due to the association between low transmissivity and high water table gradients. A comparison of different parameters shows that drainage density is most sensitive to transmissivity, followed by parameters that govern the initial slope and base level. The results agree with field data that show a negative correlation between transmissivity and drainage density. These results imply that permeability and transmissivity exert a strong control on drainage density, stream incision and landscape evolution. Thus, models of landscape evolution may need to explicitly include groundwater flow.

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Section: Groundwater Capturementioning

confidence: 99%

Transmissivity and groundwater flow exert a strong influence on drainage density

Luijendijk¹

2022

Earth Surf. Dynam.

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“…Furthermore, the view that soil aggregation hinders runoff does not coincide with the prevailing runoff mechanism which takes place in arid and semiarid regions. Due to limited rain, SOF does not take place in these areas, and runoff generation takes place only following HOF (Horton, 1933;Kidron, 2021), which implies infiltration impediment only following surface saturation regardless of subsurface water content and regardless whether the subsurface is aggregated or not.…”

Section: The Possible Involvemet Of Eps In Runoff Generation 21 Enhanced Soil Aggregationmentioning

confidence: 99%

The role of biocrust-induced exopolymeric matrix in runoff generation in arid and semiarid zones – a mini review

Kidron

2021

Journal of Hydrology and Hydromechanics

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Although playing an important role in shaping the environment, the mechanisms responsible for runoff initiation and yield in arid and semiarid regions are not yet fully explored. With infiltration-excess overland flow, known also as Hortonian overland flow (HOF) taking place in these areas, the uppermost surface ‘skin’ plays a cardinal role in runoff initiation and yield. Over large areas, this skin is composed of biocrusts, a variety of autotrophs (principally cyanobacteria, green algae, lichens, mosses) accompanied by heterotrophs (such as fungi, bacteria, archaea), which may largely dictate the infiltration capability of the surface. With most biocrust organisms being capable of excreting extracellular polymeric substances (EPS or exopolymers), and growing evidence pointing to the capability of certain EPS to partially seal the surface, EPS may play a cardinal role in hindering infiltration and triggering HOF. Yet, despite this logic thread, great controversy still exists regarding the main mechanisms responsible for runoff generation (runoff initiation and yield). Elucidation of the possible role played by EPS in runoff generation is the focus of the current review.

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“…The process of groundwater capture is expected to be important wherever streamflow is dominated either by groundwater discharge or saturation overland flow. In systems where infiltration-excess flow is dominant, which includes most semi-arid and arid regions (Kidron, 2021), groundwater capture could still occur and would determine which streams discharge groundwater and are active perennially, but streams that are detached from the groundwater table would still be able to incise. In addition, groundwater capture may be less important for systems dominated by subsurface stormflow in perched aquifers that are detached from the watertable.…”

Section: Limitations Of the Model Codementioning

confidence: 99%

Transmissivity and groundwater flow exert a strong influence on drainage density

Luijendijk¹

2021

Preprint

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Abstract. The extent to which groundwater flow affects drainage density and erosion has long been debated, but is still uncertain. Here, I present a new hybrid analytical and numerical model that simulates groundwater flow, overland flow, hillslope erosion and stream incision. The model is used to explore the relation between groundwater flow and the incision and persistence of streams for a set of parameters that represent average humid climate conditions. The results show that transmissivityand groundwater flow exert a strong control on drainage density. High transmissivity results in low drainage density and high incision rates and vice versa, with drainage density varying roughly linearly with transmissivity. The model evolves by a process that is defined here as groundwater capture, whereby streams with a higher rate of incision draw the watertable below neighbouring streams, which subsequently run dry and stop incising. This process is less efficient in models with low transmissivity due to the association of low transmissivity and high watertable gradients. A comparison of different parameters shows that drainage density is the most sensitive to transmissivity, followed by parameters that govern initial slope and stream erosion. These results imply that permeability and transmissivity exert a strong control on drainage density, stream incision and landscape evolution and that models of landscape evolution may need to explicitly include groundwater flow.

show abstract

Comparing overland flow processes between semiarid and humid regions: Does saturation overland flow take place in semiarid regions?

Cited by 19 publications

References 78 publications

Transmissivity and groundwater flow exert a strong influence on drainage density

Transmissivity and groundwater flow exert a strong influence on drainage density

The role of biocrust-induced exopolymeric matrix in runoff generation in arid and semiarid zones – a mini review

Transmissivity and groundwater flow exert a strong influence on drainage density

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