Evolución geológico-geomorfológica cuaternaria del tramo superior del valle del río Laja

Thiele, Ricardo; Moreno, H.; Elgueta, Sara; Lahsen, Alfredo; Rebolledo, Sofía; Petit-Breuilh, M. Eugenia

doi:10.4067/s0716-02081998000200007

Cited by 28 publications

(24 citation statements)

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“…This is in line with the high storage capacity observed in basins of volcanic origin located in central Chile that drain from the Andes. Moreover, it is expected given the high permeability of the predominantly granular type soils (Thiele et al 1998). (c) The parameters P Lim and D are related to the direct recharge processes of the aquifer.…”

Section: Resultsmentioning

confidence: 99%

Identifiability analysis: towards constrained equifinality and reduced uncertainty in a conceptual model

Muñoz

Rivera

Vergara

et al. 2014

Hydrological Sciences Journal

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Different sets of parameters and conceptualizations of a basin can give equally good results in terms of predefined objective functions. Therefore, a need exists to tackle equifinality and quantify the uncertainty bands of a model. In this paper we use the concepts of equifinality, identifiability and uncertainty to propose a simple method aimed at constraining the equifinal parameters and reducing the uncertainty bands of model outputs, and obtaining physically possible and reasonable models. Additionally, the uncertainty of equifinal solutions is quantified to estimate the amount by which output uncertainty can be reduced by knowing how to discard most of the equifinal solutions of a model. As a study case, a conceptual model of the Chillán basin in Chile is carried out. From the study it is concluded that using identifiability analysis makes it possible to constrain equifinal solutions with reduced uncertainty and realistic models, resulting in a framework that can be recommended to practitioners, especially due to the simplicity of the method. En outre, l'incertitude de solutions équivalentes est quantifiée pour estimer dans quelle mesure l'incertitude de sortie peut être réduite en sachant comment rejeter la plupart des solutions équivalentes d'un modèle. Comme étude de cas, nous avons construit un modèle conceptuel du bassin du Chillán au Chili. De cette étude, nous concluons que l'utilisation de l'analyse d'identifiabilité permet de contraindre les solutions équivalentes avec une incertitude réduite et des modèles réalistes, ce qui définit un cadre pouvant être recommandé aux praticiens, en particulier en raison de la simplicité de la méthode.

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Section: Resultsmentioning

confidence: 99%

Identifiability analysis: towards constrained equifinality and reduced uncertainty in a conceptual model

Muñoz

Rivera

Vergara

et al. 2014

Hydrological Sciences Journal

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“…The Andean zone of the river (600 to 2000 m.a.s.l.) is composed of sedimentary and plutonic rocks on which there are volcanic and volcanoclastic deposits of the Antuco-Sierra Velluda volcanic complex (Thiele et al, 1998). The central depression consists of the large Laja River black sand cone alluvial deposit (100 to 300 m.a.s.l.…”

Section: Case Studymentioning

confidence: 99%

Comparison of Gridded and Measured Rainfall Data for Basin-scale Hydrological Studies

Muñoz

Álvarez

Billib

et al. 2011

Chilean J. Agric. Res.

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Global gridded climatological (GGC) datasets, including precipitation and temperature, are becoming more and more precise, accessible, and common, but the utility of these datasets and their limits for hydrological research are still not well determined. In this paper, we compare the performance of two hydrological models that are identical in structure but built with two different inputs: rainfall from rain gauge stations and from a GGC dataset. The objective is to evaluate the utility of gridded datasets in water resource availability studies mainly for hydroelectric and agricultural purposes. The Andean basin of the Laja River, located in south-central Chile, was chosen for this study. It was based on an 18-yr simulation, and it was concluded that i) with gridded climatological datasets in a monthly water balance model, it is possible to reproduce the behavior of an Andean basin with good goodness-of-fit, but with worse results than when using inputs from rain gauges; ii) the amount of rainfall in gridded datasets in the Andean area of the Laja basin is underestimated and damped, an effect which is transferred to the simulated flows; and iii) regarding the main activities in the Laja basin, global gridded datasets are useful for hydrological studies with agricultural purposes prior to a treatment that considers the orographic effect. On the other hand, these datasets are useless for hydroelectric purposes due to the large underestimation of peak flows obtained during the rainy season.

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“…(a) Laja Lake: located at the slope of the Andean mountains (860-3550 m above sea level (masl)), with soils of low permeability (Thiele et al, 1998). The Laja Lake, together with the El Toro hydropower plant, plays an important role in the flow regime.…”

Section: Study Areamentioning

confidence: 99%

Gridded data for a hydrological model in a scarce-data basin

Muñoz¹,

Arumí²,

Rivera³

et al. 2014

Proceedings of the Institution of Civil Engineers - Water Manag

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The hydrology of scarce-data areas, such as the mountainous area of the Andes, is poorly known mainly owing to the lack of data. Global gridded climatological datasets (GGCDs) are becoming more precise and common, but the utility of these datasets and their applicability to complex hydrological systems are still not yet well determined. In this paper the reliability of a GGCD is evaluated as an alternative source to supply the lacking in situ observations, with the aim of studying the hydrology of a mountainous area in south-central Chile. The GGCDs are found to recover the climate variability in Andean areas, and partially recover the orographic effect caused by the mountains. A finding of practical relevance is that GGCDs could be considered as an adequate source for performing hydrological models and studies under high spatial variability and scarce-data environments such as the Andes.

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Evolución geológico-geomorfológica cuaternaria del tramo superior del valle del río Laja

Cited by 28 publications

References 0 publications

Identifiability analysis: towards constrained equifinality and reduced uncertainty in a conceptual model

Identifiability analysis: towards constrained equifinality and reduced uncertainty in a conceptual model

Comparison of Gridded and Measured Rainfall Data for Basin-scale Hydrological Studies

Gridded data for a hydrological model in a scarce-data basin

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