Modelling the link between hillslope water movement and stream flow: application to a small Mediterranean forest watershed

Taha, Ammar; Grésillon, Jean-Michel; Clothier, Brent

doi:10.1016/s0022-1694(97)00081-4

Cited by 39 publications

(26 citation statements)

References 25 publications

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“…Bovi et al, 1997), geomorphic (e.g. Taha et al, 1997;Vieira, 2001), soil planning (Kuráz, 2001) and geotechnical engineering (e.g. Campos et al, 1992;Moreira, 1998) studies.…”

Section: Methodsmentioning

confidence: 99%

Landslides in Rio de Janeiro: The role played by variations in soil hydraulic conductivity

Vieira

Fernandes

2004

Hydrological Processes

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Abstract:Landslides are natural processes triggered by complex relationships between many conditioning factors. In Rio de Janeiro city, intense rainstorms combined with steep slopes, usually occupied by slums, create favourable conditions for landslide generation. In general, slope failures are related to high positive pore-pressures inside soil mantles, which are associated with topographic hollows and hydraulic discontinuities inside the deep weathered profile.This study aims to characterize the role played by spatial variations in saturated soil hydraulic conductivity K sat on landsliding in the Papagaio Basin (2Ð5 km 2 ), triggered by intense rainstorms (250 mm in less than 2 days) in February 1996. Field measurements, using the Guelph permeameter, were conducted along soil profiles (up to 5Ð0 m depth), around and inside landslide scars representing different geomorphological domains. Also, soil physical properties (grain size, total porosity, macroporosity, microporosity, etc.) were evaluated at the 87 sites where K sat was measured.Despite the many geological and pedological variations inside the basin, including changes in lithology, fracture density, vegetation type and succession stage, soil characteristics and weathering stage, and human activities, 94% of the K sat values varied by only two orders of magnitude 1Ð0 ð 10 6 -9Ð0 ð 10 5 m s 1 ). However, abrupt changes in K sat were observed along some of the soil profiles studied, e.g. an increase of two orders of magnitude in only 0Ð30 m. These hydraulic discontinuities may contribute locally to the development of high pore pressures during intense rainstorms, leading to landsliding. The results also suggest that different K sat variation patterns coexist inside the basin, which should be considered in mathematical models of landslide prediction.

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“…Bovi et al, 1997), geomorphic (e.g. Taha et al, 1997;Vieira, 2001), soil planning (Kuráz, 2001) and geotechnical engineering (e.g. Campos et al, 1992;Moreira, 1998) studies.…”

Section: Methodsmentioning

confidence: 99%

Landslides in Rio de Janeiro: The role played by variations in soil hydraulic conductivity

Vieira

Fernandes

2004

Hydrological Processes

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“…In practice, however, the separation between the two compartments is purely arbitrary since both are physically connected (Bencala, 2000), and its hydrodynamics are complex since stream water and hillslope groundwater converge. Several theoretical papers (Taha et al, 1997;Serrano and Workmann, 1998;Barlow et al 2000) and field studies (Morrice et al, 1997;Wondzell and Swanson, 1996;Wroblichy et al, 1998;McDonnell, 1998) have emphasised the importance of hydrological interactions between the stream water and the near-stream at reach scale. On the other hand, hydrogeologists highlight the role of soil moisture (Bras, 1990) and of the spatial hydrological heterogeneity in influencing the runoff generation in catchments (Merz and Bárdossy, 1998;Becker et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

The influence of riparian-hyporheic zone on the hydrological responses in an intermittent stream

Butturini

Bernal

Sabater

et al. 2002

Hydrol. Earth Syst. Sci.

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Stream and riparian groundwater hydrology has been studied in a small intermittent stream draining a forested catchment for a system representative of a Mediterranean climate. The relationship between precipitation and stream runoff and the interactions between stream water and the surrounding riparian groundwater have been analysed under a wide spectrum of meteorological conditions. The hypothesis that the hydrological condition of the near-stream groundwater compartment can regulate the runoff generation during precipitation events was tested. Stream runoff is characterised by a summer dry period, and precipitation input explained only 25% of runoff variability over the study period (r 2 =0.25, d.f.=51, p<0.001). The variability of precipitation v. stream runoff is explained partly by the hydrogeological properties of the riparian near-stream zone. This zone is characterised by high hydrological conductivity values and abrupt changes in groundwater level in summer. The summer dry period begins with a rapid decrease in near-stream groundwater level, and ends just after the first autumnal rain when the original groundwater level recovers suddenly. Within this period, storms do not cause major stream runoff since water infiltrates rapidly into the riparian compartment until it is refilled during the subsequent winter and spring; then the precipitation explains the 80% of the stream runoff variability (r 2 =0.80, d.f.=34, p<0.001). These results suggest that the hydrological interaction between the riparian groundwater compartment and the stream channel is important in elucidating the hydrological responses during drought periods in small Mediterranean streams.

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“…Despite this uncertainty, the coarse assumption that the event water across a storm hydrograph represents greater than 50% of discharge seems reasonable. While infiltration excess overland flow is often cited as the dominant runoff mechanism in semi-arid regions, a growing body of work suggests that saturation excess overland flow may also contribute significantly [Taha et al, 1997], leading us to propose the model outlined above a reasonable hypothesis of runoff generation in the San Jose.…”

Section: San Jose: Overall Model Rejectionmentioning

confidence: 99%

On the use of multiple criteria for a posteriori model rejection: Soft data to characterize model performance

Vaché

McDonnell

Bolte

2004

Geophysical Research Letters

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[1] Land surface hydrologic models are commonly evaluated based upon the degree of correspondence between measured and modeled discharge. In this paper we illustrate significant shortcomings associated with the simple discharge based evaluation strategy. A standard conceptual hydrologic model is applied within a Monte Carlo framework to two catchments representing significantly different hydrologic regimes. Time source hydrograph separations are derived, in addition to modeled discharge, and used to more completely characterize model functioning, across the entire a priori parameter distribution. The inclusion of hydrograph separation results in improved characterization of parameter uncertainty, and in one of the cases, complete model rejection.

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Modelling the link between hillslope water movement and stream flow: application to a small Mediterranean forest watershed

Cited by 39 publications

References 25 publications

Landslides in Rio de Janeiro: The role played by variations in soil hydraulic conductivity

Landslides in Rio de Janeiro: The role played by variations in soil hydraulic conductivity

The influence of riparian-hyporheic zone on the hydrological responses in an intermittent stream

On the use of multiple criteria for a posteriori model rejection: Soft data to characterize model performance

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