Differential responses of hillslope and channel elements to rainfall events in a semi-arid area

Puigdefábregas, Juan; Barrio, Gabriel del; Boer, Matthias M.; Gutiérrez, L.; Solé, Albert

doi:10.1016/s0169-555x(98)00014-2

Cited by 103 publications

(92 citation statements)

References 10 publications

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“…The coexistence of shrub and herb species can capture more resources with strong seed germination, initiating a positive feedback loop of autogenic rehabilitation. The runoff and sediment production mechanism under different vegetation cover and land use may be distinct (Peugeot et al, 1997;Puigdefábregas et al, 1998) even within the same rainfall event. In field studies of cropland and pastureland, variation in soil erosion with time can be explained reasonably well in cases where there was a change in cropping or tillage (Paningbatan et al, 1995;Presbitero et al, 1995) as well as the formation and development of soil crust (Luk and Cai, 1990;Zhu et al, 1997).…”

Section: The Variation Of Water and Soil Lossmentioning

confidence: 99%

The relative efficiency of four representative cropland conversions in reducing water erosion: evidence from long‐term plots in the Loess hilly area, China

Huang

Chen

et al. 2006

Land Degrad Dev

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Large areas of traditional slope cropland were recently converted to other land-use types in the semiarid Loess Plateau of China. In this study, we selected four representative conversion options of slope croplands, i.e., pastureland rotated with cropland (cultivated with Medicago sativa L. and rotated with Triticum aestivum L.), shrubland and woodland (afforested with Hippophae rhamnoides L. and Pinus tabulaeformis), and grassland (native herbage Stipa breviflora) to study the effect of landuse conversion by comparing with traditional cropland. Compared with slope cropland, the relative effects of different conversion options on surface runoff and soil erosion were assessed over a 14-year measurement period. Observations showed that distinct features and consequences of vegetation succession were found among the conversion options. Plots of shrubland had the highest vegetation coverage with dense undergrowth; natural herbaceous and subshrub species gradually spread into plots of grassland resulting in higher vegetation cover. Neither bushes nor herbs colonized the plots of Pinus tabulaeformis, which resulted in a higher percentage of bare soil. Significant differences in runoff generation, sediment yield and conservation efficiencies among the selected conversion options were detected through an analyses of variance (ANOVA). Compared with cropland, total runoff and sediment decreased by 65 per cent and 95 per cent in shrubland, 41 per cent and 92Á5 per cent in grassland, 18 per cent and 77 per cent in woodland, and 12 per cent and 58 per cent in pastureland, respectively. The ranking of soil and water conservation efficiencies was shrubland > grassland > woodland > pastureland > cropland. Based on the effectiveness of soil and water conservation, shrubland and grassland are highly recommended as promising options for cropland conversion projects. However, pastureland and woodland are not suggested as potential options for slope-cropland conversion because of low soil and water conservation in the long term.

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Section: The Variation Of Water and Soil Lossmentioning

confidence: 99%

The relative efficiency of four representative cropland conversions in reducing water erosion: evidence from long‐term plots in the Loess hilly area, China

Huang

Chen

et al. 2006

Land Degrad Dev

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“…The technical characteristics of SBIB probes, their calibration as well as successful results with replicates of the same prototype used in different soils, are detailed in different publications (Puigdefábregas et al, , 1998Vidal et al, 1996;Domingo et al, 1999Domingo et al, , 2001Cantón et al, 2001Cantón et al, , 2004. Beginning in July 2003, six probes were installed in a 10 Â 10 m area the eddy tower at a depth of 0.06 m. Moreover, at the end of 2003, six additional y probes were installed in the same place at two depths (three at a depth of 0.06 m and three more at 0.25 m depth), such that y data at two depths are available only from 12 February 2004 to 31 August 2005.…”

Section: Field Measurementsmentioning

confidence: 99%

Temporal dynamics of soil water balance components in a karst range in southeastern Spain: estimation of potential recharge

Cantón

Villagarcı́a

Moro

et al. 2010

Hydrological Sciences Journal

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This paper analyses the temporal dynamics of soil water balance components in a representative recharge area of the Sierra de Gádor (Almeria, southeastern Spain) in two hydrological years. Two approaches are used to estimate daily potential recharge (PR): Approach 1 based on deriving PR from the water balance as the difference between measurements of rainfall (P) and actual evapotranspiration (E) obtained by eddy covariance; and Approach 2 with PR obtained from the dynamic pattern of the soil moisture (y) recorded at two depths in the site's thin soil (average 0.35 m thickess). For the hydrological year 2003/04, which was slightly drier than the 30-year average, E accounted for 64% of rainfall and occurred mainly in late spring and early summer. The PR estimated by Approach 1 was 181 AE 18 mm year -1 (36% of rainfall), suggesting an effective groundwater recharge in the study area. In the unusually dry hydrological year 2004/05, E was about 215 mm year -1 , close to the annual rainfall input, and allowing very little (8 AE 12 mm year -1 ) PR according to Approach 1. Estimation of PR based on Approach 2 resulted in PR rates lower than those found by Approach 1, because Approach 2 does not take into account the recharge that occurs through preferential flow pathways (cracks, joints and fissures) which were not monitored with the y probes. Moreover, using Approach 2, the PR estimates differed widely depending on the time scale considered: with daily mean y data, PR estimation was lower, especially in late spring, while y data at 30 min resolution yielded a more reliable prediction of the fraction of total PR resulting from the downward movement of soil water by gravity.Key words potential recharge; evapotranspiration; soil moisture; soil water balance; Mediterranean; Sierra de Gádor Dynamique temporelle des composantes du bilan hydrique du sol dans une chaine karstique du sud-est de l'Espagne: estimation de la recharge potentielle Résumé Ce travail analyse la dynamique temporelle des composantes du bilan hydrique du sol dans une zone de recharge représentative de la Sierra de Gador (Almeria, SE de l'Espagne) pendant deux années hydrologiques. Deux approches ont été utilisées pour estimer la recharge potentielle journalière (RP): dans l'approche 1, RP est calculée à partir de la différence entre les mesures de pluie (P) et d'évapotranspiration réelle (E) obtenues par la méthode de la covariance turbulente; dans l'approche 2, RP est obtenue à partir de l'humidité du sol (y) mesurée à deux profondeurs dans les sols peu profonds du site (épaisseur moyenne de 0.35 m). Pendant l'année hydrologique

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“…Decreasing runoff coefficients with increasing slope length due to a large variability of soil characteristics were also observed by Bonell and Williams (1986) and Puigdefabregas et al (1998) for semi-arid and by Van de Giesen et al (2000) for sub-humid environments.…”

Section: Landscape Variability and Hydrological Processes In Semi-arimentioning

confidence: 74%

“…A distinction between slope segments as runoff source areas and colluvial footslope areas or alluvial deposits in the valley bottoms as sink areas for runon was highlighted for semi-arid areas by Yair and Lavee (1985), De Boer (1992), Peugeot et al (1997), Ceballos and Schnabel (1998) and Puigdefabregas et al (1998). These studies also demonstrate that discontinuities of hydrological pathways can exist between runoff generating areas and the channel network or the catchment outlet particularly for dry conditions (Fitzjohn et al, 1998;Bergkamp, 1998;Cammeraat, 2002).…”

Section: Landscape Variability and Hydrological Processes In Semi-arimentioning

confidence: 75%

“…However, it may occur for some specific conditions, as, for instance, during the rainy period in valley bottoms (Ceballos and Schnabel, 1998;Gresillon and Taha, 1998) or on soils of high infiltration capacity but low storage capacity, e.g. shallow soils above bedrock of low conductivity (Cadier, 1993;Martinez-Mena et al, 1998;Puigdefabregas et al, 1998). Beyond the local scale, the runoff response at the hillslope or at the catchment scale has frequently been shown to be influenced by the variability of landscape characteristics An important aspect of patch-scale variability in semi-arid areas is introduced by the neighbourhood of vegetated and bare soil surfaces, as observed in many dryland vegetation types (see summary of examples in Klausmeier, 1999;Reid et al, 1999).…”

Section: Landscape Variability and Hydrological Processes In Semi-arimentioning

confidence: 99%

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Representation of landscape variability and lateral redistribution processes for large-scale hydrological modelling in semi-arid areas

Güntner

Bronstert

2004

Journal of Hydrology

105

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The spatial variability of landscape features such as topography, soils and vegetation defines the spatial pattern of hydrological state variables like soil moisture. Spatial variability thereby controls the functional behaviour of the landscape in terms of its runoff response. A consequence of spatial variability is that exchange processes between landscape patches can occur at various spatial scales ranging from the plot to the basin scale. In semi-arid areas, the lateral redistribution of surface runoff between adjacent landscape patches is an important process. For applications to large river basins of 10 4 -10 5 km 2 in size, a multi-scale landscape discretization scheme is presented in this paper. The landscape is sub-divided into modelling units within a hierarchy of spatial scale levels. By delineating areas characterized by a typical toposequence, organised and random variability of landscape characteristics is captured in the model. Using runoff -runon relationships with transition frequencies based on areal fractions of modelling units, lateral surface and subsurface water fluxes between modelling units at the hillslope scale are represented. Thus, the new approach allows for a manageable description of interactions between fine-scale landscape features for inclusion in coarse-scale models. Model applications for the State of Ceará (150,000 km 2 ) in the north-east of Brazil demonstrate the importance of taking into account landscape variability and interactions between landscape patches in a semiarid environment. Using mean landscape characteristics leads to a considerable underestimation of infiltration-excess surface runoff and total simulated runoff. Re-infiltration of surface runoff and lateral redistribution processes between landscape patches cause a reduction of runoff volumes at the basin scale and contribute to the amplification of variations in runoff volumes relative to variations in rainfall volumes for semi-arid areas. q 2004 Published by Elsevier B.V.

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Differential responses of hillslope and channel elements to rainfall events in a semi-arid area

Cited by 103 publications

References 10 publications

The relative efficiency of four representative cropland conversions in reducing water erosion: evidence from long‐term plots in the Loess hilly area, China

The relative efficiency of four representative cropland conversions in reducing water erosion: evidence from long‐term plots in the Loess hilly area, China

Temporal dynamics of soil water balance components in a karst range in southeastern Spain: estimation of potential recharge

Representation of landscape variability and lateral redistribution processes for large-scale hydrological modelling in semi-arid areas

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