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Coupled hydrogeophysical parameter estimation using a sequential Bayesian approach
hydrogeophysical parameter estimation sequential Bayesian approach
2010/4/7
Coupled hydrogeophysical methods infer hydrological and petrophysical parameters directly from geophysical measurements. Widespread methods do not explicitly recognize uncertainty in parameter estimat...
Investigation of a parameter estimation method for contaminant transport in aquifers
Investigation parameter estimation method contaminant transport aquifers
2009/12/4
Real world groundwater aquifers are heterogeneous and system variables are not uniformly distributed across the aquifer. Therefore, in the modelling of the contaminant transport, we need to consider t...
FITTING A THREE-PARAMETER LOG-NORMAL DISTRIBUTION BY LEAST SQUARES
THREE-PARAMETER LOG-NORMAL DISTRIBUTION LEAST SQUARES
2009/10/29
A three-parameter log-normal distribution is derived as an exact functional
transform ot an embcdded normal distribution. The parameters of
this function are evaluated by fitting to histograms of na...
Parameter Determination for Chloride and Tritium Transport in Undisturbed Lysimeters during Steady Flow
Parameter Determination Chloride Tritium Transport
2009/10/26
Breakthrough curves of C1 and 3 ~ 2we0re o btained during steady unsaturated
flow in five lysimeters containing an undisturbed coarse sand (Orthic Haplohumod).
The experimental data were analyzed in...
Estimation of Parameter Uncertainty in the HBV Model
Estimation of Parameter Uncertainty HBV Model
2009/10/23
Usually the HBV model is calibrated by seeking one optimal parameter set that
represents the catchment. From experience we know, however, that it is hardly
poss~ble to find an unique parameter set. ...
A novel approach to parameter uncertainty analysis of hydrological models using neural networks
hydrological models neural networks Artificial Neural Network
2009/7/22
In this study, a methodology has been developed to emulate a time consuming Monte Carlo (MC) simulation by using an Artificial Neural Network (ANN) for the assessment of model parametric uncertainty. ...
Implementing surface parameter aggregation rules in the CCM3 global climate model：regional responses at the land surface
surface parameter aggregation land surface CCM3 global climate model
2009/5/27
The land-surface parameters required as input to a GCM grid box (typically a few degrees) are often set to be those of the dominant vegetation type within the grid box. This paper discusses the use an...
Imposing constraints on parameter values of a conceptual hydrological model using baseflow response
conceptual hydrological model baseflow response
2009/5/26
Calibration of conceptual hydrological models is frequently limited by a lack of data about the area that is being studied. The result is that a broad range of parameter values can be identified that ...
Centrifuge modeling of one-step outflow tests for unsaturated parameter estimations
one-step outflow tests unsaturated parameter estimations
2009/5/15
Centrifuge modeling of one-step outflow tests were carried out using a 2-m radius geotechnical centrifuge, and the cumulative outflow and transient pore water pressure were measured during the tests a...
A mass conservative and water storage consistent variable parameter Muskingum-Cunge approach
Muskingum-Cunge variable parameter Muskingum-Cunge approach water storage
2009/5/13
The variable parameter Muskingum-Cunge (MC) flood routing approach, together with several variants proposed in the literature, does not fully preserve the mass balance, particularly when dealing with ...
Sensitivity analysis and parameter estimation for distributed hydrological modeling：potential of variational methods
Sensitivity analysis distributed hydrological modeling singular value decomposition
2009/4/28
Variational methods are widely used for the analysis and control of computationally intensive spatially distributed systems. In particular, the adjoint state method enables a very efficient calculatio...
Parameter extrapolation to ungauged basins with a hydrological distributed model in a regional framework
regional framework hydrological distributed model
2009/4/27
A Regional Water Resources study was performed at basins within and draining to the Basque Country Region (N of Spain), with a total area of approximately 8500 km2. The objective was to obtain daily a...
Land surface scheme conceptualisation and parameter values for three sites with contrasting soils and climate
land surface model soil hydraulic properties
2009/3/24
The objective of the present study is to test the performance of the ECMWF land surface module (LSM) developed by Viterbo and Beljaars (1995) and to identify primary future adjustments, focusing on th...
Influence of parameter estimation uncertainty in Kriging: Part 2 - Test and case study applications
yearly rainfall maximum likelihood
2009/3/23
The theoretical approach introduced in Part 1 is applied to a numerical example and to the case of yearly average precipitation estimation over the Veneto Region in Italy. The proposed methodology was...
Influence of parameter estimation uncertainty in Kriging: Part 1 - Theoretical Development
Kriging maximum likelihood parameter estimation
2009/3/23
This paper deals with a theoretical approach to assessing the effects of parameter estimation uncertainty both on Kriging estimates and on their estimated error variance. Although a comprehensive trea...