... E-mail address: andres.navas@usach.cl. 0021-8693/$ see front matter 2010 Published by Elsevie... more ... E-mail address: andres.navas@usach.cl. 0021-8693/$ see front matter 2010 Published by Elsevier Inc. doi:10.1016/j.jalgebra.2010.10.020 JID:YJABR AID:13159 /FLA [m1G; v 1.47; Prn:8/11/2010; 8:44] P.2(1-12) 2 A. Navas / Journal of Algebra ( ) Fig. ...
Mineria Industria Y Medio Ambiente En La Cuenca Mediterranea Homenaje Al Prof Antonio Maranes 1999 Isbn 84 8240 229 3 Pags 283 296, 1999
Información del artículo Gestión ambiental de recursos hídricos: el caso del valle bajo del río A... more Información del artículo Gestión ambiental de recursos hídricos: el caso del valle bajo del río Almanzora (Almería).
Riparian zones in semi-arid regions often exhibit high rates of evapotranspiration (ET) in spite ... more Riparian zones in semi-arid regions often exhibit high rates of evapotranspiration (ET) in spite of low soil moisture content because riparian vegetation are adapted to withdraw water from shallow aquifers. This work better defines the relationship between ET and the saturated zone by comparing the observed and analytically modeled water table drawdown in fully penetrating wells of an unconfined aquifer in response to daily ET flux. ET at the Boise Hydrogeophysical Research Site (BHRS) is calculated following the form of Batra et al. (2006) but uses site (or near site) measurements for air temperature and net radiation while relying on Landsat 5 Thematic Mapper data for quantification of vegetation. The resulting ET calculations represent a data set consisting of high resolution (30m2) ET flux values obtained from minimal site measurements. Water table levels in the shallow, unconfined aquifer were monitored from May through September, 2009 to record the timing and magnitude of daily fluctuations due to vegetation at four separate wells at the site. ET derived from the radiation driven model compare favorably with ground water ET (ETG) contribution calculated from well hydrographs, supporting the hypothesis that the contribution of the unsaturated zone to ET fluxes is negligible in shallow aquifer systems. Using the analytical solution of Malama and Johnson (2010) for a semi-infinite (or river bounded) domain, daily drawdown is modeled in response to daily ET flux applied at the water table. Close agreement between observed and modeled draw down supports the idea that ET can be estimated from well hydrographs in a well characterized aquifer and conversely, if ET is well characterized, aquifer parameters like hydraulic conductivity and specific storage can be estimated from well hydrographs.
Problematica Geoambiental Y Desarrollo V Reunion Nacional De Geologia Ambiental Y Ordenacion Del Territorio Murcia 1993 V Reunion Nacional De Geologia Ambiental Y Ordenacion Del Territorio Murcia 1993 1993 Isbn 84 604 6291 9 Pags 433 442, 1993
Información del artículo Movilidad de los metales pesados en el acuífero deltaico de río Almanzor... more Información del artículo Movilidad de los metales pesados en el acuífero deltaico de río Almanzora (Almería).
Mineria Industria Y Medio Ambiente En La Cuenca Mediterranea Homenaje Al Prof Antonio Maranes 1999 Isbn 84 8240 229 3 Pags 97 110, 1999
Información del artículo Caracterización de la calidad de suelos de uso industrial en áreas afect... more Información del artículo Caracterización de la calidad de suelos de uso industrial en áreas afectadas por actividades mineras e industriales.
Using probabilistic methods, we prove new rigidity results for groups and pseudo-groups of diffeo... more Using probabilistic methods, we prove new rigidity results for groups and pseudo-groups of diffeomorphisms of one dimensional manifolds with intermediate regularity class ({\em i.e.} between $C^1$ and $C^2$). In particular, we demonstrate some generalizations of Denjoy's Theorem and the classical Kopell's Lemma for Abelian groups. After that, these techniques are applied to the study of codimension 1 foliations. We obtain for instance several generalized versions of Sacksteder's Theorem in class $C^1$. We conclude with some remarks about the stationary measure.
This work is devoted to the study of minimal, smooth actions of finitely generated groups on the ... more This work is devoted to the study of minimal, smooth actions of finitely generated groups on the circle. We provide a sufficient condition for such an action to be ergodic (with respect to the Lebesgue measure), and we illustrate this condition by studying two relevant examples. Under an analogous hypothesis, we also deal with the problem of the zero Lebesgue measure for exceptional minimal sets. This hypothesis leads to many other interesting conclusions, mainly concerning the stationary and conformal measures. Moreover, several questions are left open. The methods work as well for codimension-one foliations, though the results for this case are not explicitly stated.
Problematica Geoambiental Y Desarrollo V Reunion Nacional De Geologia Ambiental Y Ordenacion Del Territorio Murcia 1993 V Reunion Nacional De Geologia Ambiental Y Ordenacion Del Territorio Murcia 1993 1993 Isbn 84 604 6291 9 Pags 129 138, 1993
Acceso de usuarios registrados. Acceso de usuarios registrados Usuario Contraseña. ...
Información del artículo Caracterización de la contaminación producida por actividades mineras en... more Información del artículo Caracterización de la contaminación producida por actividades mineras en los suelos de la Cuenca Baja del Río Almanzora.
We study skew-maps given by a minimal homeomorphism on the basis and a cocycle of affine isometri... more We study skew-maps given by a minimal homeomorphism on the basis and a cocycle of affine isometries on the fibers. We call such a map a cylindrical vortex. We extend to this setting some classical results of Atkinson, Besicovitch, Matsumoto-Shishikura and Schinelman (among other people) about cylindrical cascades. In particular, we show that no cylindrical vortex is minimal, and we construct interesting examples of topologically transitive ones.
Soil hydraulic and thermal properties (SHTPs) affect both the rate of moisture redistribution in ... more Soil hydraulic and thermal properties (SHTPs) affect both the rate of moisture redistribution in the soil column and the volumetric soil water capacity. Adequately constraining these properties through field and lab analysis to parameterize spatially-distributed hydrology models is often prohibitively expensive. Because SHTPs vary significantly at small spatial scales individual soil samples are also only reliably indicative of local conditions, and these properties remain a significant source of uncertainty in soil moisture and temperature estimation. In ensemble-based soil moisture data assimilation, uncertainty in the model-produced prior estimate due to associated uncertainty in SHTPs must be taken into account to avoid under-dispersive ensembles. To treat SHTP uncertainty for purposes of supplying inputs to a distributed watershed model we use the restricted pairing (RP) algorithm, an extension of Latin Hypercube (LH) sampling. The RP algorithm generates an arbitrary number of SHTP combinations by sampling the appropriate marginal distributions of the individual soil properties using the LH approach, while imposing a target rank correlation among the properties. A previously-published meta- database of 1309 soils representing 12 textural classes is used to fit appropriate marginal distributions to the properties and compute the target rank correlation structure, conditioned on soil texture. Given categorical soil textures, our implementation of the RP algorithm generates an arbitrarily-sized ensemble of realizations of the SHTPs required as input to the TIN-based Realtime Integrated Basin Simulator with vegetation dynamics (tRIBS+VEGGIE) distributed parameter ecohydrology model. Soil moisture ensembles simulated with RP- generated SHTPs exhibit less variance than ensembles simulated with SHTPs generated by a scheme that neglects correlation among properties. Neglecting correlation among SHTPs can lead to physically unrealistic combinations of parameters that exhibit implausible hydrologic behavior when input to the tRIBS+VEGGIE model.
We show that bi-Lipschitz conjugacies between non singular one dimensional systems are forced to ... more We show that bi-Lipschitz conjugacies between non singular one dimensional systems are forced to be smooth, at least in the minimal (and ergodic) case. This is however far from being true in the non minimal case. These results clarify a classical work by Ghys and Tsuboi.
We provide a pure algebraic version of the dynamical characterization of Conrad's property. This ... more We provide a pure algebraic version of the dynamical characterization of Conrad's property. This approach allows dealing with general group actions on totally ordered spaces. As an application, we give a new and somehow constructive proof of a theorem first established by Linnell: an orderable group having infinitely many orderings has uncountably many. This proof is achieved by extending to uncountable orderable groups a result about orderings which may be approximated by their conjugates. This last result is illustrated by an example of an exotic ordering on the free group given in the Appendix.
We prove that if d is an integer number bigger than 1 and f_1,...,f_d are commuting circle diffeo... more We prove that if d is an integer number bigger than 1 and f_1,...,f_d are commuting circle diffeomorphisms respectively of class C^(1+\tau_k), where \tau_1 + ... + \tau_k > 1, then these maps are simultaneously conjugate to rotations provided that their rotation numbers are independent over the rationals.
... E-mail address: andres.navas@usach.cl. 0021-8693/$ see front matter 2010 Published by Elsevie... more ... E-mail address: andres.navas@usach.cl. 0021-8693/$ see front matter 2010 Published by Elsevier Inc. doi:10.1016/j.jalgebra.2010.10.020 JID:YJABR AID:13159 /FLA [m1G; v 1.47; Prn:8/11/2010; 8:44] P.2(1-12) 2 A. Navas / Journal of Algebra ( ) Fig. ...
Mineria Industria Y Medio Ambiente En La Cuenca Mediterranea Homenaje Al Prof Antonio Maranes 1999 Isbn 84 8240 229 3 Pags 283 296, 1999
Información del artículo Gestión ambiental de recursos hídricos: el caso del valle bajo del río A... more Información del artículo Gestión ambiental de recursos hídricos: el caso del valle bajo del río Almanzora (Almería).
Riparian zones in semi-arid regions often exhibit high rates of evapotranspiration (ET) in spite ... more Riparian zones in semi-arid regions often exhibit high rates of evapotranspiration (ET) in spite of low soil moisture content because riparian vegetation are adapted to withdraw water from shallow aquifers. This work better defines the relationship between ET and the saturated zone by comparing the observed and analytically modeled water table drawdown in fully penetrating wells of an unconfined aquifer in response to daily ET flux. ET at the Boise Hydrogeophysical Research Site (BHRS) is calculated following the form of Batra et al. (2006) but uses site (or near site) measurements for air temperature and net radiation while relying on Landsat 5 Thematic Mapper data for quantification of vegetation. The resulting ET calculations represent a data set consisting of high resolution (30m2) ET flux values obtained from minimal site measurements. Water table levels in the shallow, unconfined aquifer were monitored from May through September, 2009 to record the timing and magnitude of daily fluctuations due to vegetation at four separate wells at the site. ET derived from the radiation driven model compare favorably with ground water ET (ETG) contribution calculated from well hydrographs, supporting the hypothesis that the contribution of the unsaturated zone to ET fluxes is negligible in shallow aquifer systems. Using the analytical solution of Malama and Johnson (2010) for a semi-infinite (or river bounded) domain, daily drawdown is modeled in response to daily ET flux applied at the water table. Close agreement between observed and modeled draw down supports the idea that ET can be estimated from well hydrographs in a well characterized aquifer and conversely, if ET is well characterized, aquifer parameters like hydraulic conductivity and specific storage can be estimated from well hydrographs.
Problematica Geoambiental Y Desarrollo V Reunion Nacional De Geologia Ambiental Y Ordenacion Del Territorio Murcia 1993 V Reunion Nacional De Geologia Ambiental Y Ordenacion Del Territorio Murcia 1993 1993 Isbn 84 604 6291 9 Pags 433 442, 1993
Información del artículo Movilidad de los metales pesados en el acuífero deltaico de río Almanzor... more Información del artículo Movilidad de los metales pesados en el acuífero deltaico de río Almanzora (Almería).
Mineria Industria Y Medio Ambiente En La Cuenca Mediterranea Homenaje Al Prof Antonio Maranes 1999 Isbn 84 8240 229 3 Pags 97 110, 1999
Información del artículo Caracterización de la calidad de suelos de uso industrial en áreas afect... more Información del artículo Caracterización de la calidad de suelos de uso industrial en áreas afectadas por actividades mineras e industriales.
Using probabilistic methods, we prove new rigidity results for groups and pseudo-groups of diffeo... more Using probabilistic methods, we prove new rigidity results for groups and pseudo-groups of diffeomorphisms of one dimensional manifolds with intermediate regularity class ({\em i.e.} between $C^1$ and $C^2$). In particular, we demonstrate some generalizations of Denjoy's Theorem and the classical Kopell's Lemma for Abelian groups. After that, these techniques are applied to the study of codimension 1 foliations. We obtain for instance several generalized versions of Sacksteder's Theorem in class $C^1$. We conclude with some remarks about the stationary measure.
This work is devoted to the study of minimal, smooth actions of finitely generated groups on the ... more This work is devoted to the study of minimal, smooth actions of finitely generated groups on the circle. We provide a sufficient condition for such an action to be ergodic (with respect to the Lebesgue measure), and we illustrate this condition by studying two relevant examples. Under an analogous hypothesis, we also deal with the problem of the zero Lebesgue measure for exceptional minimal sets. This hypothesis leads to many other interesting conclusions, mainly concerning the stationary and conformal measures. Moreover, several questions are left open. The methods work as well for codimension-one foliations, though the results for this case are not explicitly stated.
Problematica Geoambiental Y Desarrollo V Reunion Nacional De Geologia Ambiental Y Ordenacion Del Territorio Murcia 1993 V Reunion Nacional De Geologia Ambiental Y Ordenacion Del Territorio Murcia 1993 1993 Isbn 84 604 6291 9 Pags 129 138, 1993
Acceso de usuarios registrados. Acceso de usuarios registrados Usuario Contraseña. ...
Información del artículo Caracterización de la contaminación producida por actividades mineras en... more Información del artículo Caracterización de la contaminación producida por actividades mineras en los suelos de la Cuenca Baja del Río Almanzora.
We study skew-maps given by a minimal homeomorphism on the basis and a cocycle of affine isometri... more We study skew-maps given by a minimal homeomorphism on the basis and a cocycle of affine isometries on the fibers. We call such a map a cylindrical vortex. We extend to this setting some classical results of Atkinson, Besicovitch, Matsumoto-Shishikura and Schinelman (among other people) about cylindrical cascades. In particular, we show that no cylindrical vortex is minimal, and we construct interesting examples of topologically transitive ones.
Soil hydraulic and thermal properties (SHTPs) affect both the rate of moisture redistribution in ... more Soil hydraulic and thermal properties (SHTPs) affect both the rate of moisture redistribution in the soil column and the volumetric soil water capacity. Adequately constraining these properties through field and lab analysis to parameterize spatially-distributed hydrology models is often prohibitively expensive. Because SHTPs vary significantly at small spatial scales individual soil samples are also only reliably indicative of local conditions, and these properties remain a significant source of uncertainty in soil moisture and temperature estimation. In ensemble-based soil moisture data assimilation, uncertainty in the model-produced prior estimate due to associated uncertainty in SHTPs must be taken into account to avoid under-dispersive ensembles. To treat SHTP uncertainty for purposes of supplying inputs to a distributed watershed model we use the restricted pairing (RP) algorithm, an extension of Latin Hypercube (LH) sampling. The RP algorithm generates an arbitrary number of SHTP combinations by sampling the appropriate marginal distributions of the individual soil properties using the LH approach, while imposing a target rank correlation among the properties. A previously-published meta- database of 1309 soils representing 12 textural classes is used to fit appropriate marginal distributions to the properties and compute the target rank correlation structure, conditioned on soil texture. Given categorical soil textures, our implementation of the RP algorithm generates an arbitrarily-sized ensemble of realizations of the SHTPs required as input to the TIN-based Realtime Integrated Basin Simulator with vegetation dynamics (tRIBS+VEGGIE) distributed parameter ecohydrology model. Soil moisture ensembles simulated with RP- generated SHTPs exhibit less variance than ensembles simulated with SHTPs generated by a scheme that neglects correlation among properties. Neglecting correlation among SHTPs can lead to physically unrealistic combinations of parameters that exhibit implausible hydrologic behavior when input to the tRIBS+VEGGIE model.
We show that bi-Lipschitz conjugacies between non singular one dimensional systems are forced to ... more We show that bi-Lipschitz conjugacies between non singular one dimensional systems are forced to be smooth, at least in the minimal (and ergodic) case. This is however far from being true in the non minimal case. These results clarify a classical work by Ghys and Tsuboi.
We provide a pure algebraic version of the dynamical characterization of Conrad's property. This ... more We provide a pure algebraic version of the dynamical characterization of Conrad's property. This approach allows dealing with general group actions on totally ordered spaces. As an application, we give a new and somehow constructive proof of a theorem first established by Linnell: an orderable group having infinitely many orderings has uncountably many. This proof is achieved by extending to uncountable orderable groups a result about orderings which may be approximated by their conjugates. This last result is illustrated by an example of an exotic ordering on the free group given in the Appendix.
We prove that if d is an integer number bigger than 1 and f_1,...,f_d are commuting circle diffeo... more We prove that if d is an integer number bigger than 1 and f_1,...,f_d are commuting circle diffeomorphisms respectively of class C^(1+\tau_k), where \tau_1 + ... + \tau_k > 1, then these maps are simultaneously conjugate to rotations provided that their rotation numbers are independent over the rationals.
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