Chapter 2 Catchment dynamics in a Mediterranean mountain environment: the Vallcebre research basins (southeastern Pyrenees) II: Temporal and spatial dynamics of erosion and stream sediment transport

Gallart, Francesc; Balasch, Josep Carles; Regüés, D.; Soler, M.; Castelltort, Xavier

doi:10.1016/s0928-2025(05)80008-2

Cited by 28 publications

(33 citation statements)

References 14 publications

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“…These values agrees with the soil erosion values measured by other authors in similar areas of the Spanish Pyrenees, such as García- Ruiz et al [2008] and Gallart et al [2005].…”

Section: Phd Dissertationsupporting

confidence: 92%

“…The most important four events accounted for the 80% of the total SY, while the most relevant eight for the 90%. This phenomenon, which has been noticed in many ephemeral streams [Gallart et al, 2005], is due to the rainfall regime, which is characterized by long dry periods and heavy and short bursts, and to the highly non-linear relationship between water discharge and SY. The simulated texture of deposited sediments is sandy (between 87% and 100% of sand), agreeing with the field measurements, as shown in Figure 5.50.…”

Section: Temporal Validation Of the Sedimentological Submodelmentioning

confidence: 99%

“…In these cases, the runoff production takes place all over the catchment while the sediment production is concentrated in the lower zones of the hillslopes and in the channel network. In the Vallcebre catchment (East Pyrenees, Spain), Gallart et al [2005] observed that, even if the most relevant source of erosion are the badlands hillslopes, the sediment dynamics of the catchment is controlled by the gully and channel processes. The reason of this paradox is the following.…”

Section: Sediment Initial Conditionsmentioning

confidence: 99%

“…It has been proven that, in Mediterranean climate, only a few events scattered over a large time period are responsible for most of the total sediment load [Gallart et al, 2005]. Given that the aim of this study is the SY modelling, calibration and validation focused on the reproduction of large rainfall events.…”

Section: Hydrological Sub-model Calibration and Validationmentioning

confidence: 99%

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Implementation of a distributed sediment model in different data availability scenarios.

Bussi¹

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Soil erosion by water can cause agricultural soil losses, desertification, water pollution, reservoir sedimentation, local excess of erosion (such as bridge scour) or deposition, etc. For this reason, the assessment of soil erosion and sediment transport is a key component of integrated catchment management. One of the most useful and up-to-date tools available to catchment managers for soil erosion and sediment transport assessment is distributed modelling. During the last few decades, many sedimentological distributed models were developed and applied for a wide range of climates and basins. Their main advantage is that they allow spatial interpolation or extrapolation of their results. Nevertheless, their use is still limited by some constraints. One of the most relevant limitations to the use of such models is the lack of recorded sediment transport data to be used for model calibration and validation. It is widely recognised that both sediment discharge series and soil erosion measurements are only available in a few and small-to medium-size experimental catchments. The aim of this dissertation is to investigate the possibility of using reservoir sedimentation data as a source of proxy information for sedimentological model calibration and validation. In order to carry out this task, a distributed sedimentological model called TETIS was tested in set of catchments with different sediment data availability. First of all, the TETIS model, developed over the last years by the research group of hydrological and environmental modelling of the Technical University of Valencia, is described, especially focusing on the new features developed within this dissertation (sedimentological sub-model automatic calibration algorithm, small pond sediment retention module, etc.). Then, the model is applied to three catchments with different sediment data availability. The first case-study is the Goodwin Creek catchment (Mississippi, US), an experimental catchment with high sediment transport data availability. The model performance is evaluated, and some considerations are made on the estimation of the sediment volume deposited into the drainage network at the beginning of a rainstorm. The second case-study is the Rambla del Poyo catchment (Valencia, Spain), a medium size semi-arid catchment draining to a coastal lagoon with severe sedimentation problems. The TETIS sedimentological sub-model is calibrated and validated using checkdam sedimentation volumes as an estimator of the total sediment transport. A detailed description of the alluvial stratigraphy infilling a check dam that drains a 12.9 km 2 subcatchment was used as indirect information of sediment yield data. A further application was also developed in this catchment in order to investigate the possibility of calibrating and validating both the hydrological and the sediment sub-models by using reservoir sedimentation volumes and employing neither water nor sediment discharge direct records. The third case-study is the Ésera River catchment (Huesca, Spain), a...

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“…These values agrees with the soil erosion values measured by other authors in similar areas of the Spanish Pyrenees, such as García- Ruiz et al [2008] and Gallart et al [2005].…”

Section: Phd Dissertationsupporting

confidence: 92%

Section: Temporal Validation Of the Sedimentological Submodelmentioning

confidence: 99%

Section: Sediment Initial Conditionsmentioning

confidence: 99%

Section: Hydrological Sub-model Calibration and Validationmentioning

confidence: 99%

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Implementation of a distributed sediment model in different data availability scenarios.

Bussi¹

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“…La correlación entre el CE y la intensidad máxima de la precipitación no resulta significativa, confirmando la escasa influencia que tiene esta variable sobre la respuesta hidrológica en cuencas cubiertas por vegetación (Hewlett et al, 1977;Serrano-Muela et al, 2008). No obstante, la ausencia de una relación significativa entre estas dos variables a escala de evento no implica que la intensidad de la precipitación no pueda ser relevante localmente en zonas desprovistas de vegetación (Gallart et al, 2005). Por último, la correlación entre el CE y el caudal de base, considerado como indicador del estado de humedad de la cuenca, es significativa y positiva (R=0,38; p<0,01), si bien el moderado valor de R indica que el peso de esta variable no es claro.…”

Section: Figura 2 Relación Entre Precipitación (P) Y Escorrentía (E)unclassified

Diferencias estacionales en la generación de escorrentía en una pequeña cuenca de campos abandonados en el Pirineo Central

Lana-Renault

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Regüés

et al. 2013

CIG

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Spatial and temporal dynamics of soil moisture in a Mediterranean mountain area (Vallcebre, NE Spain)

et al. 2012

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Knowledge of soil moisture dynamics at reasonable temporal and spatial resolutions is required to improve hydrological understanding and modelling. However, in the Mediterranean area, considered as one of the most vulnerable areas to global change, there is a severe lack of detailed soil moisture data sets. The objective of this study is to investigate the inter‐annual and intra‐annual spatial and temporal distributions of soil moisture in a Mediterranean mountain area, using the detailed hydrological data set gathered in the Vallcebre Research catchments (NE Spain). With the use of time‐domain reflectometry, soil moisture was measured weekly between 1998 and 2003 at eight representative profiles. Time series of soil moisture showed a clear seasonal pattern. Results obtained revealed that soil moisture on hillslopes under forest cover was lower than in downslope areas covered with grasses. However, differences were not persistent through the year but were minimal during the driest and wettest conditions and maximal during the drying and wetting‐up periods. During the wetting‐up and drying‐down periods, the soil moisture distribution depended mainly on local controls. However, during wet conditions, soil moisture patterns were controlled by nonlocal factors that limited the vegetation‐related variability of soil moisture. In this mountain area, forest cover is likely to increase as the climate changes, which will most probably reduce the average soil moisture at the catchment scale as well as its spatial variability. These changes may ultimately be seen as a threat to the future of water resources in this area. Copyright © 2012 John Wiley & Sons, Ltd.

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Chapter 2 Catchment dynamics in a Mediterranean mountain environment: the Vallcebre research basins (southeastern Pyrenees) II: Temporal and spatial dynamics of erosion and stream sediment transport

Cited by 28 publications

References 14 publications

Implementation of a distributed sediment model in different data availability scenarios.

Implementation of a distributed sediment model in different data availability scenarios.

Diferencias estacionales en la generación de escorrentía en una pequeña cuenca de campos abandonados en el Pirineo Central

Spatial and temporal dynamics of soil moisture in a Mediterranean mountain area (Vallcebre, NE Spain)

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